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Subject: Environment

  • Devastation in Dima Hasao and its after-effects

    Disaster struck Dima Hasao, central Assam’s hill district, in mid-May after incessant heavy rainfall.

    Impacts of the disaster

    • The 170 km railway line connecting Lumding in the Brahmaputra Valley’s Hojai district and Badarpur in the Barak Valley’s Karimganj district was severely affected.
    • The Assam government and Railway Ministry’s assessments said the district suffered a loss of more than ₹1,000 crore, but ecologists say the damage could be irreversibly higher.

    How severe has the rain been in Assam?

    • Assam is used to floods, sometimes even four times a year, resultant landslides and erosion.
    • But the pre-monsoon showers this year have been particularly severe on Dima Hasao, one of three hill districts in the State.
    • Landslips have claimed four lives and damaged roads.
    • The impact has been most severe on the arterial railway, which was breached at 58 locations leaving the track hanging in several places.
    • The disruption of train services, unlikely to be restored soon, has cut off the flood-hit Barak Valley, parts of Manipur, Mizoram and Tripura.

    Why is the railway in focus post-disaster?

    • Dima Hasao straddles the Barail, a tertiary mountain range between the Brahmaputra and Barak River basins.
    • The district is on the Dauki fault (the prone-to-earthquakes geological fractures between two blocks of rocks) straddling Bangladesh and parts of the northeast.
    • British engineers were said to have factored in the fragility of the hills to build the railway line over 16 years by 1899.
    • The end result was an engineering marvel 221 km long over several bridges and through 37 tunnels, laid along the safer sections of the hills.

    A faulty experiment

    • A project to convert the metre gauge track to broad gauge was undertaken in 1996 but the work was completed only by March 2015 because of geotechnical constraints and extremist groups.
    • The broad-gauge track was realigned to be straighter, but a 2009-10 audit report revealed that the project had been undertaken without proper planning and visualisation of the soil strata behaviour.
    • The report gave the example of the disaster-prone Tunnel 10 on the realigned track that was pegged 8 meters below the bed of a nearby stream.

    Is only the railway at fault?

    • There is a general consensus that other factors have contributed to the situation Dima Hasao is in today.
    • Roads in the district, specifically the four-lane Saurashtra-Silchar (largest Barak Valley town) East-West Corridor, have been realigned or deviated from the old ones that were planned around rivers and largely weathered the conditions.
    • The arterial roads build over the past 20 years often cave in and get washed away by floods or blocked by landslides.
    • Shortened cycles of jhum or shifting cultivation on the hill slopes and unregulated mining have accentuated the “man-made disaster”.
    • Massive extraction of river stone, illegal mining of coal and smuggling of forest timbe has led to the disaster.
    • These activities have increased water current besides weakening either side of riverbanks.

    How vital are the rail and highway through Dima Hasao?

    • Meghalaya aside, Dima Hasao is the geographical link to a vast region comprising southern Assam’s Barak Valley, parts of Manipur, Mizoram and Tripura.
    • Moreover, this track is vital for India’s Look East policy that envisages shipping goods to and from Bangladesh’s Chittagong port via Tripura’s border points at Akhaura and Sabroom.
    • These are the last railway station near the Feni River that serves as the India-Bangladesh border.

     

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  • Hyper-accumulator Plants for Soil Detox

    A study published in the JNKVV (Jawaharlal Nehru Krishi Vishwavidyalaya) research journal concluded that heavy metal pollution of soil is “emerging at a speedy rate” in India due to industrialisation.

    How does soil get contaminated?

    • Soil contamination can happen due to a variety of reasons, including manufacturing, mineral extraction, accidental spills, illegal dumping, leaking underground storage tanks, pesticide and fertiliser use etc.
    • These toxic heavy metals are then absorbed by food crops and other plants before they eventually make their way into our food chain, directly affecting human life along with ecology.

    Detoxing the soil

    • Many technologies have emerged to remediate this soil pollution.
    • But these methods have been deemed lacking in terms of sustainability as they come with a large cost and have adverse effects themselves.

    Novel technique: Hyperaccumulators

    • Turning toward more sustainable and eco-friendly technologies, scientists have developed methods of “Phytoremediation”.
    • It is a remediation method that uses living organisms like plants, microalgae, and seaweeds.
    • One particular way to remove toxic heavy metals from the soil includes the use of “hyperaccumulator” plants that absorb these substances from the soil.

    What are hyperaccumulator plants?

    • Phytoremediation refers to the usage of “hyperaccumulator” plants to absorb the toxic materials present in the soil and accumulate in their living tissue.
    • Most plants do sometimes accumulate toxic substances.
    • Hyperaccumulators have the unusual ability to absorb hundreds or thousands of times greater amounts of these substances than is normal for most plants.
    • Most discovered hyperaccumulator plants typically accumulate nickel and occur on soils that are rich in nickel, cobalt and in some cases, manganese.

    Where are they found?

    • These hyperaccumulator species have been discovered in many parts of the world.
    • They include the Mediterranean region (mainly plants of the genus Alyssum), tropical outcrops in Brazi, Cuba, New Caledonia (French territory) and Southeast Asia (mainly plants of the genus Phyllanthus).

    How can they be used to remove toxic metals from the soil?

    • Suitable plant species can be used to ‘pick up’ the pollutants from the soil through their roots and transport them to their stem, leaves and other parts.
    • After this, these plants can be harvested and either disposed or even used to extract these toxic metals from the plant.
    • This process can be used to remove metals like silver, cadmium, cobalt, chromium, copper, mercury, manganese, molybdenum, nickel, lead and zinc; metalloids such as arsenic and selenium; some radionuclides; and non-metallic components such as boron.
    • But it cannot be used to remove organic pollutants from the ground due to metabolic breakdown.

    Advantages of phytoremediation with hyperaccumulators

    • One of the primary advantages of phytoremediation is the fact that it is quite cost-effective in comparison with other remediation methods.
    • The only major costs attached are related to crop management (planting, weed control, watering, fertilisation, pruning, fencing, harvesting etc.).
    • This method is also relatively simple and doesn’t require any new kinds of specialised technology.
    • Also, no external energy source is required since the plants grow with the help of sunlight.
    • Another important advantage of this method is that it enriches the soil with organic substances and microorganisms which can protect its chemical and biological qualities.
    • Also, while the plants are growing and accumulating toxic heavy metals, they protect the soil from erosion due to wind and water.

    Limitations of hyperaccumulators

    • For all its advantages, this kind of phytoremediation with hyperaccumulators has a big drawback: it is a very slow and time-consuming process.
    • The restoration of an area with this process can take up to 10 years or more.
    • This comes with a large economic cost, proportional to the size of the area under rehabilitation.
    • The plants to conduct this rehabilitation must be carefully selected based on a large number of characteristics or they could act as an invasive species.
    • They could grow out of control and upsetting the delicate ecological balance of not just the area under rehabilitation, but also the entire region it is part of.

    What can be done for their better utilization?

    • Due to this reason, scientists only propose using species that are native to the region where the phytoremediation project is undertaken.
    • This also has other benefits: these plants will already be acclimatised to the region and there will be no legal problems concerning the procurement, transport and use of seeds.

     

     

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  • India’s Vulnerability to Drought

    A United Nations report ‘Drought in Numbers’ has revealed that many parts of India fall under the list of regions that are vulnerable to drought globally.

    What are Droughts?

    • Drought is a prolonged dry period in the natural climate cycle that can occur anywhere in the world.
    • It is a slow-onset disaster characterized by the lack of precipitation, resulting in a water shortage.

    Types of Droughts

    • Meteorological drought is defined usually on the basis of the degree of dryness (in comparison to some “normal” or average amount) and the duration of the dry period.
    • Agricultural drought should be able to account for the variable susceptibility of crops during different stages of crop development, from emergence to maturity.
    • Hydrological drought is associated with the effects of periods of precipitation (including snowfall) shortfalls on surface or subsurface water supply (i.e. streamflow, reservoir and lake levels, and groundwater).
    • Socioeconomic drought is associated with the supply and demand of some economic goods with elements of meteorological, hydrological, and agricultural drought.

    What is the Drought in Numbers report?

    • The Drought in Numbers report is a collection of data on the effects of droughts on our ecosystem and how they can be mitigated through efficient planning for the future.
    • The report also helps inform negotiations surrounding key decisions by the UNCCD’s 197 member parties at the 15th Conference of Parties (COP15), currently underway in Abidjan, Côte d’Ivoire.
    • Drought, land restoration, and related aspects such as land rights, gender equality and youth empowerment are among the top considerations at COP15.

    What is COP15?

    • The UN Convention to Combat Desertification (UNCCD) COP15 focuses on desertification, land degradation, and drought.
    • The theme for the conference is “Land. Life. Legacy: From scarcity to prosperity.”
    • The conference has brought together government representatives, private sector members, and civil society stakeholders to ensure that land continues to benefit present and future generations.

    What does the report entail?

    • The number and duration of droughts around the world has increased by an alarming 29% since 2000.
    • Globally, droughts in the same period caused economic losses of approximately $124 billion.
    • Drought conditions can force up to 216 million people to migrate by 2050.
    • Other factors at play along with drought could be water scarcity, declining crop productivity, rise in sea levels, and overpopulation.
    • The report also stated that India’s GDP reduced by 2 to 5% between 1998 and 2017 due to severe droughts in the country.

    Gendered impacts of drought

    • Research shows that women and girls in emerging and developing countries suffer more in terms of education levels, nutrition, health, sanitation, and safety as a result of droughts.
    • The burden of water collection also disproportionately falls on women (72%) and girls (9%).
    • The report notes that they may spend up to 40% of their caloric intake fetching water.

    What are the environmental aspects?

    • The largest increase in drought losses is projected in the Mediterranean and the Atlantic regions of Europe.
    • Australia’s megadrought in 2019-2020 contributed to “megafires” resulting in one of the most extensive losses of habitat for threatened species.
    • About three billion animals were killed or displaced in the Australian wildfires.
    • Around 12 million hectares of land are lost each year due to drought and desertification.

     

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  • What is Stockholm+50?

    Stockholm+50 conference — a follow-on to the 1972 conference to be held in Stockholm from 2-3 June 2022 is the one that started the environmental movement we see today.

    What is Stockholm +50?

    • Stockholm +50 is an international environmental meeting hosted by the United Nations General Assembly to be held in Stockholm, Sweden from 2-3 June 2022.
    • The theme of Stockholm+50 is “a healthy planet for the prosperity of all – our responsibility, our opportunity.
    • In 1972, the UN Conference on the Environment in Stockholm was held, and it was essentially the first conference that managed to address environmental issues on the right level.
    • Fifty years later, the United Nations is back in Stockholm to commemorate that important milestone.

    Significance: Establishment of UNEP

    • In 1972, some 122 countries attended, and participants adopted a series of principles on the environment, including the Stockholm Declaration and Action Plan for the Human Environment.
    • The United Nations Environment Programme (UNEP) was created as a result of the conference.

    What is India’s connection with this?

    • Then Prime Minister Indira Gandhi in her seminal speech in the conference brought forward the connection between ecological management and poverty alleviation.
    • Her call remains as pertinent now as then: “We have to prove to the disinherited majority of the world that ecology and conservation will not work against their interest but will bring an improvement in their lives.”

    Why is Stockholm +50 important?

    • There was a lot of media attention around COP26 last year where world leaders gathered to continue the work to uphold the actions promised by the Paris Agreement, 2015.
    • Later this year, there will be COP27 in Egypt, where organizers will aim to make the conference a radical turning point in international climate efforts.

    What will be happening at Stockholm +50?

    • The event in the beginning of June will see representatives from around the world gather in Stockholm to discuss how to achieve a sustainable and inclusive future for all.
    • Stockholm +50 could usher in a much-needed new boost to environmental awareness and action for the next half-century, just as it did five decades ago.

     

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  • Biological Diversity (Amendment) Bill, 2021

    What is issue:

    A senior parliamentarian has expressed concern over the Biological Diversity (Amendment) Bill, 2021, which is in the final stages of consultations in the Joint Parliamentary Committee.

    Biological Diversity Act (BDA), 2002: 

    • The BDA, 2002 was enacted for the conservation of biological diversity and fair, equitable sharing of the monetary benefits from the commercial use of biological resources and traditional knowledge.
    • The main intent of this legislation is to protect India’s rich biodiversity and associated knowledge against their use by foreign individuals.
    • It seeks to check biopiracy, protect biological diversity and local growers through a three-tier structure of central and state boards and local committees.
    • The Act provides for setting up of a National Biodiversity Authority (NBA), State Biodiversity Boards (SBBs) and Biodiversity Management Committees (BMCs) in local bodies.
    • The NBA will enjoy the power of a civil court.

    What are the proposed Amendments?

    The amendment bill seeks to reduce the pressure on wild medicinal plants by encouraging the cultivation of medicinal plants and Decriminalizes certain offences.

    • Biological resources sharing: Exempts Ayush practitioners from intimating biodiversity boards for accessing biological resources or knowledge (Vaids and Hakims)
    • Research promotion: Facilitates fast-tracking of research, simplify the patent application process
    • Bring in foreign investment: Seeks to bring more foreign investments in biological resources, research, patent and commercial utilisation, without compromising the national interest

    Need for the Amendment

    • Simplifying process: Concerns were raised by Ayush medicine, seed, industry and research sectors urging the government to simplify, streamline the profession.
    • Easing compliance: They urged govt to reduce the compliance burden to provide for a conducive environment for collaborative research and investments.
    • Access and Benefit-sharing: It also sought to simplify the patent application process, widen the scope of access and benefit-sharing with local communities.
    • Exemptions: Ayush practitioners have been exempted from the ambit of the Act, a huge move because the Ayush industry benefits greatly from biological resources in India.
    • Certain offences: Violations of the law related to benefit-sharing with communities, which are currently treated as criminal offences and are non-bailable, have been proposed to be made civil offences.
    • Imbibing Nagoya Protocol: This bill provides to reconcile the domestic law with free prior informed consent requirements of the 2010 Nayogya Protocol on ABS.

    Criticisms of the bill

    • No consultation: The bill has been introduced without seeking public comments as required under the pre-legislative consultative policy.
    • No profit-sharing: There are ambiguous provisions in the proposed amendment to protect, conserve or increase the stake of local communities in the sustainable use and conservation of biodiversity.
    • Commercialization: Activists say that the amendments were done to “solely benefit” the AYUSH Ministry.
    • Loopholes to Biopiracy: The Bill would mean AYUSH manufacturing companies would no longer need to take approvals.
    • Ignoring Bio-utilization: The bill has excluded the term Bio-utilization which is an important element in the Act.  Leaving out bio utilization would leave out an array of activities like characterization, incentivisation and bioassay which are undertaken with commercial motive.
    • Exotic plants cultivation: The bill also exempts cultivated medicinal plants from the purview of the Act but it is practically impossible to detect which plants are cultivated and which are from the wild.
    • De-licensing: This provision could allow large companies to evade the requirement for prior approval or share the benefit with local communities.

  • Highlights of the Seoul Forest Declaration

    The participants from 141 countries gathered in person and online at the 15th World Forestry Congress in Seoul, Republic of Korea adopted the Seoul Forest Declaration.

    Seoul Forest Declaration

    • Shared responsibility: The Declaration urges that responsibility for forests should be shared and integrated across institutions, sectors and stakeholders.
    • Increased investment: Investment in forest and landscape restoration globally needs to triple by 2030 to meet internationally agreed commitments and targets on restoring degraded land.
    • Moving towards circular economy: One of the key takeaways was the importance of moving towards a circular bioeconomy and climate neutrality.
    • Innovative green financing mechanisms: To upscale investment in forest conservation, restoration and sustainable use, and highlighted the potential of sustainably produced wood as a renewable, recyclable and versatile material.
    • Decision-making: It urged the continued development and use of emerging innovative technologies and mechanisms to enable evidence-based forest and landscape decision-making.

    Other takeaways

    • Close cooperation among nations is needed to address challenges that transcend political boundaries.
    • This was strengthened at the Congress by the launch of new partnerships such as the:
    1. Assuring the Future of Forests with Integrated Risk Management (AFFIRM) Mechanism and
    2. Sustaining an Abundance of Forest Ecosystems (SAFE) Initiative

    Back2Basics: World Forestry Congress

    • The first World Forestry Congress first held in Rome in 1926. After that, it is held about every six years by the UN-FAO.
    • In 1954, FAO was entrusted with supporting Congress preparations in close cooperation with the host country and proudly continues to do so today. .
    • It has been providing a forum for inclusive discussion on the key challenges and way forward for the forestry sector.

     

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  • What are Urban Heat Islands?

    Several parts of the country are reeling under heat wave conditions. Cities, especially, are a lot hotter than rural areas. This is due to a phenomenon called an “urban heat island”.

    Urban Heat Island

    • An urban heat island is a local and temporary phenomenon experienced when certain pockets within a city experience higher heat load than surrounding or neighbouring areas on the same day.
    • The variations are mainly due to heat remaining trapped within locations that often resemble concrete jungles.
    • The temperature variation can range between 3 to 5 degrees Celsius.

    Why are cities hotter than rural areas?

    • Green cover: Rural areas have relatively larger green cover in the form of plantations, farmlands, forests and trees as compared to urban spaces.
    • Transpiration: Transpiration is a natural way of heat regulation. This is the scientific process of roots absorbing water from the soil, storing it in the leaves and stems of plants, before processing it and releasing it in the form of water vapour.
    • Heat-regulation: Urban areas are often developed with high-rise buildings, roads, parking spaces, pavements and transit routes for public transport. As a result, heat regulation is either completely absent or man-made.
    • Construction: Cities usually have buildings constructed with glass, bricks, cement and concrete all of which are dark-coloured materials, meaning they attract and absorb higher heat content.

    This forms temporary islands within cities where the heat remains trapped.

    How can urban heat islands be reduced?

    • The main way to cut heat load within urban areas is increasing the green cover; filling open spaces with trees and plants.
    • Other ways of heat mitigation include appropriate choice of construction materials, promoting terrace and kitchen gardens, and painting white or light colours on terraces wherever possible to reflect heat.

    What has NASA said on urban heat islands in India?

    • NASA recently pointed out heat islands in urban parts of Delhi, where temperatures were far higher than nearby agricultural lands.
    • It used its Ecosystem Spaceborne Thermal Radiometer Experiment (Ecostress) on the International Space Station.

     

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  • Ramgarh Vishdhari notified as India’s 52nd Tiger Reserve

    Ramgarh Vishdhari Wildlife Sanctuary is now notified as a tiger reserve after a nod by the Union Ministry of Environment, Forest and Climate Change (MoEF&CC).

    Ramgarh Vishdhari TR

    • Ramgarh Vishadhri, located mostly in Bundi district and in part in Bhilwara and Kota districts.
    • It is also home to the Indian wolf, leopard, striped hyena, chinkara, antelope and foxes among other animals.
    • It is now India’s 52nd tiger reserve and Rajasthan’s fourth, after Ranthambore, Sariska and Mukundra.
    • The reserve will be spread in an area of 1,501.89 sq km.
    • The area has been called ‘critical’ for the movement of tigers by wildlife experts and conservationists.
    • Though the tiger population in Ramgarh itself was not high, it plays an important role in connecting the Ranthambore and Mukundra Tiger Reserves of Rajasthan.

    Back2Basics: Tiger Reserves

    • The Tiger Reserves of India were set up in 1973 and are governed by Project Tiger, which is administrated by the National Tiger Conservation Authority.
    • A National Park or Wildlife Sanctuary that is considered significant for protecting tigers can be additionally designated as a Tiger Reserve.
    • A Tiger Reserve consists of a ‘Core’ or ‘Critical Tiger Habitat’, which is to be managed as an inviolate area, and a ‘Buffer’ or Peripheral area immediately abutting a Core area, which may be accorded a lesser degree of habitat protection.
    • This is the typical zonation of a Tiger Reserve.

     

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  • What is Onset of Monsoon?

    The monsoon is slated to make its earliest arrival in 13 years over Kerala, informs the India Meteorological Department (IMD).

    What does the “Onset of Monsoon” mean?

    • The onset of the monsoon over Kerala marks the beginning of the four-month, June to September southwest monsoon season over India.
    • It brings more than 70 per cent of the country’s annual rainfall.
    • It marks a significant transition in the large-scale atmospheric and ocean circulations in the Indo-Pacific region.
    • The IMD announces it only after certain newly defined and measurable parameters, adopted in 2016, are met.
    • The onset is a significant day in India’s economic calendar.

    How does IMD predict the monsoon?

    • Broadly, the IMD checks for the consistency of rainfall over a defined geography, its intensity, and wind speed:
    1. Rainfall: The IMD declares the onset of the monsoon if at least 60% of 14 designated meteorological stations in Kerala and Lakshadweep record at least 2.5 mm of rain for two consecutive days at any time after May 10.
    2. Wind field: The depth of westerlies should be upto 600 hectopascal (1 hPa is equal to 1 millibar of pressure) in the area bound by the equator to 10ºN latitude, and from longitude 55ºE to 80ºE. The zonal wind speed over the area bound by 5-10ºN latitude and 70-80ºE longitude should be of the order of 15-20 knots (28-37 kph) at 925 hPa.
    3. Heat: The INSAT-derived Outgoing Longwave Radiation (OLR) value (a measure of the energy emitted to space by the Earth’s surface, oceans, and atmosphere) should be below 200 watt per sq m (wm2) in the box confined by 5-10ºN latitude and 70-75ºE latitude.
    • The onset is not officially declared until the prescribed conditions (above) are met.

    Factors considered by IMD

    • The IMD uses a specialised model that forecasts the arrival dates within a four-day window.
    • It uses six predictors:
    1. Minimum temperatures over northwest India
    2. Pre-monsoon rainfall peak over south Peninsula
    3. Outgoing long-wave radiation (OLR) over the South China Sea
    4. Lower tropospheric zonal wind over the southeast Indian Ocean
    5. Upper tropospheric zonal wind over the east equatorial Indian Ocean, and
    6. OLR over the southwest Pacific region

    Where is the early arrival noticed?

    • The monsoon’s arrival over India is marked by rain over south Andaman Sea, which then advances north-westwards across the Bay of Bengal.
    • In general, the Andaman and Nicobar Islands start receiving monsoon rainfall between May 15 and May 20 every year.
    • And it usually starts raining along the Kerala coast in the last week of May.

    Does an early onset foretell a good monsoon?

    • No, it does not — just as a delay does not foretell a poor monsoon.
    • The onset is just an event that happens during the progress of the monsoon over the Indian subcontinent.
    • A delay of a few days, or perhaps the monsoon arriving a few days early, has no bearing on the quality or amount of rainfall, or its regional distribution across the country.

    Back2Basics: Long Period Average (LPA)

    • The IMD predicts a “normal”, “below normal”, or “above normal” monsoon in relation to a benchmark “long period average” (LPA).
    • The LPA of rainfall is the rainfall recorded over a particular region for a given interval (like month or season) average over a long period like 30 years, 50 years, etc.
    • LPA refers to the average rainfall recorded from June to September for the entire country, the amount of rain that falls every year varies from region to region and from month to month.
    • The IMD’s prediction of a normal monsoon is based on the LPA of the 1971-2020 period, during which India received 87 cm of rain for the entire country on average.
    • It has in the past calculated the LPA at 88 cm for the 1961-2010 period, and at 89 cm for the period 1951-2000.

    Why LPA is needed?

    • The IMD records rainfall data at more than 2,400 locations and 3,500 rain-gauge stations.
    • Because annual rainfall can vary greatly not just from region to region and from month to month, but also from year to year within a particular region or month.
    • An LPA is needed to smooth out trends so that a reasonably accurate prediction can be made.
    • A 50-year LPA covers for large variations in either direction caused by freak years of unusually high or low rainfall, as well as for the periodic drought years.
    • It also takes into account the increasingly common extreme weather events caused by climate change.

    Range of normal rainfall

    The IMD maintains five rainfall distribution categories on an all-India scale. These are:

    1. Normal or near normal, when the percentage departure of actual rainfall is +/-10% of LPA, that is, between 96-104% of LPA;
    2. Below normal, when departure of actual rainfall is less than 10% of LPA, that is 90-96% of LPA;
    3. Above normal, when actual rainfall is 104-110% of LPA;
    4. Deficient, when departure of actual rainfall is less than 90% of LPA; and
    5. Excess, when the departure of actual rainfall is more than 110% of LPA.

    Also read

    Various terms related to Indian Monsoon

     

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  • Green Manure and its productivity benefits

    The Punjab agriculture department is promoting the cultivation of green manure these days.

    What is the news?

    • Punjab Agro is providing subsidy on the seed at the rate of Rs 2,000 per quintal, which costs Rs 6,300 per quintal without subsidy
    • The farmers can avail its seed from the block level offices of the agriculture department as limited stock is available.

    What is Green Manure?

    • Green manures are crops grown specifically for maintaining soil fertility and structure.
    • It is done by leaving uprooted or sown crops parts, allowing them to wither onto the field and serve as mulch and soil fertilizers.
    • They are normally incorporated back into the soil, either directly, or after removal and composting.
    • There are three main varieties of green manure, including
    1. Dhaincha
    2. Cowpea
    3. Sunhemp
    • Also some crops such as summer moong, mash pulses and guar act as green manure.
    • They can be sown after wheat cultivation

    Characteristics of green manure

    • Green manure must be leguminous in nature
    • They must bear maximum nodules on its roots to fix large amount of atmospheric nitrogen in the soil.

    Various policy initiatives

    • Under Sub- Mission on Seed and Planting Material (SMSP), the govt. provides 50% cost assistance for the distribution of green manure required for a one-acre area per farmer.
    • The Paramparagat Krishi Vikas Yojana (PKVY) promotes cluster-based organic farming with PGS (Participatory Guarantee System) certification.