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Back | home Components of Organic Farming Tuesday, September 29, 2015 Organic Farming: An eco-friendly approach for sustainable Agriculture development in North Eastern Region of India Agriculture is now becoming transformed into dynamic productive and profitable sector because of ever-increasing demand for food and food products. In order to cope up with the food production target, more emphasis is likely to be given to agricultural inputs. The use of chemicals as plant protection practices acts as an insurance against the risk of loosing not only the crop but also the money spent on advanced technology used as inputs in attaining higher production. Breakthrough in the development of different agrochemicals and their widespread use at the farm level indeed has helped to boost the agricultural production in all countries. During the traditional technology period in India, the use of chemical pesticide was limited mainly to the high value crops only. The traditional varieties did not face much problem of insect pest and diseases and if at all they occurred, the traditional method available could control them. However, the introduction of hybrids and adoption of intensive cropping practices, demanded high pesticide use to check the yield losses. At present thousands of chemicals are used for agricultural production. Those chemicals interact with different components of the plant ecosystem and contamination may take place in respect of one component or the other. In recent years use of chemicals especially fertilizer and pesticides have become a cause for serious concern as it has been marked out as pollutants having adverse effects on environment including human being. In recent years several reports suggests that the agrochemical, especially the chemical fertilizers are resulting in environmental degradation by way of polluting plant and soil environment, water bodies, effecting the ozone layer etc. They also contaminate the ground water and surface water resulting in eutrophication of water bodies. Pesticides are now extensively used to control various pests, which are harmful to crops raised by man for food, feed and fibre production. Though they have played an important role in boosting the agricultural production, however, most of the chlorinated pesticides are non-biodegradable and leave residues, which are detrimental to human beings, animals and the environment. Residue studies in India have also revealed wide spread contamination of the food products and the environment as a whole. The presence of residues of insecticide in food commodities and other components of the environment is a matter of serious concern. Even small quantities of the residues ingested daily along with food can build up to high level in body fat (Dhaliwal and Singh, 1993). There is therefore, a constant fear that society is being slowly poisoned by the intake of food contamination with pesticide residue. While both the fertilizer and the pesticide usage has lead to increased crop production and greater economic return to the farmers, their impact on soil and water environment and crop quality was not considered relevant until the last ten years. There is now increasing evidence show that indiscriminate use of agrochemical can have adverse effect on soil environment (Naidu et al, 1996). It is evident from the table 1 and 2 that the rate of consumption of fertilizers and pesticide is in increasing trend both in the North-Eastern region as well as in the whole country. Keeping the hazardous effects of inorganic fertilizers and the agro-chemicals on environment as well as on the human being, therefore, it is an urgent need for the developing country like India to shift to the organic agriculture from the existing inorganic agriculture as most of the arable soils in India contain organic carbon below the threshold level and majority of the farming community is resource poor and purchase of fertilizers and chemicals in adequate quantities is beyond their capacity. This is equally true for the North Eastern Region of the country which accounts 7.64% of the total area of the country. Agriculture is by far the most important occupation of the people of this region. The most of the farmers of this region are generally small and marginal in nature and are economically not sound and therefore, they can not afford to buy the adequate amount of fertilizers and chemicals necessary for the crop production. Organic Agriculture is a production system that avoids or largely excludes the use of chemical fertilizers, pesticides and growth regulators. The main aim of organic agriculture is to ensure sustained productivity, environmental protection and making available food and food products raised without chemicals of any kind. Agriculture is primarily applied biology and is most likely to be successful when it accepts and follows principles such as (a) on farm waste recycling, (b) non- chemical weed management, (c) biological pest control, (d) Integrated nutrient management for sustaining soil fertility and crop productivity. With increasing health consciousness and concern for environment, organic farming system has been drawing attention allover the world. Organic farming is a holistic production management system, which promotes and enhances agro- ecosystems health including bio-diversity, biological cycles and soil biological activities. As a result, there is widespread organic movement and large demands for organic products. Fertilizer and Pesticide Consumption Scenario in North Eastern Region: Table 1. Total consumption of NPK in NE Region ('000 tones)
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Transcript of NESAC-Organic Farming_Details.pdf
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State 1995-96 1996-97 1997-98
Arunachal Pradesh 0.38 0.55 0.55
Assam 49.14 55.81 71.25
Manipur 11.83 13.18 13.09
Meghalaya 2.97 3.43 3.30
Mizoram 0.78 0.39 0.97
Nagaland 0.52 0.85 0.58
Tripura 8.45 8.62 10.42
All India 13876.17 14308.13 16194.78
Source: CMIE Report, September, 1999
Table: 2 Consumption of Pesticides in NER (Tones)
State 1985-86 1986-87 1987-88 1994-95
Arunachal Pradesh
Assam
Manipur
Meghalaya
Mizoram
Nagaland
Tripura
All India
Source: Centre for Monitoring Indian Economy, Bombay, 1996 and TERI data Directory and Year book 1999& 2000.
Components of Organic Farming:
Major components of organic farming are crop rotation, maintenance and enhancement of soil fertility through biologicalnitrogen fixation, addition of organic manure and use of soil microorganisms, crop residues, bio-pesticide, biogas slurry,waste etc. Vermiculture has become a major component in biological farming, which is found to be effective inenhancing the soil fertility and producing large numbers of horticultural crops in a sustainable manner. The variouscomponents of organic farming have been discussed in details below:
1. Crop rotation:
It is a systematic arrangement for the growing of different crops in a more or loss regular sequence on the same landcovering a period of two years or more. The selection of optimal crop rotation is important for successful sustainableagriculture. Crop rotation is very important. Soil fertility management, weed, insect and disease control. Legumes areessential in any rotation and should 30 to 50 percent of the land. A mixed cropping, pasture and livestock system isdesirable or even essential for the success of sustainable agriculture.
2. Crop Residue:
In India there is a great potential for utilization of crop residues/ straw of some of the major cereals and pulses. About50% of the crop residues are utilized as animal fed, the rest could be very well utilized for recycling of nutrients.Adequate care is required to use the residues after proper composting with efficient microbial inoculants. While the
incorporation of crop residues e.g. Wheat and Rice straw, as such or inoculated with fungal species had beneficialeffects on crop yields and important in physico-chemical properties of soil.
3. Organic manure:
The organic manure is derived from biological sources like plant, animal and human residues. Organic manure act inmany ways in augmenting crop growth and soil productivity. The direct effect of organic manure relates to the uptake of humic substances or its decomposition products affecting favourably the growth and yield of plants. Indirectly, itaugments the beneficial soil microorganisms and their activities and thus increases the availability of major and minorplant nutrients.
a) Bulky organic manure: It generally contains fewer amounts of plant nutrients as compared to concentrated
organic manure. It includes FYM, compost and Green manure.
FYM: It refers to the well-decomposed mixture of dung, urine, farm litter and left over or used up materials from
roughages or fodder fed to the cattle. The waste material of cattle shed consisting of dung and urine soaked inthe refuse is collected and placed in trenches about 6 m long, 2 m wide and 1 m deep. Each trench is filled up toa height of about 0.5 m above the ground level and plastered over with slurry cowdung and earth. The materialis allowed to decompose undisturbed 3-4 months for anaerobic microorganism for completion of fermentation.FYM becomes ready to apply after 3-4 months. Well-rotted FYM contains 0.5% N, 0.2% P205 and 0.5% K2O.
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Compost: Large quantities of waste material are available as vegetable refuse, farm litter, such as weeds,
stubble, bhusa, sugarcane trash, Sewage sludge and animal waste in houses and in areas like human andindustrial refuse; therefore, excreta can be converted into useful compost manure by conserving and subjectingthese to a controlled process of anaerobic decomposition. Compost is used in the same way as FYM and is goodfor application to all soils and all crops.
Green Manuring: It is a practice of ploughing or turning into the soil undercomposed green plant tissues for the
purpose of improving physical structure as well as fertility of the soil. From the time immemorial the turning in agreen crop for improvement of the conditions of the soil has been a popular farming practice. Green Manuring,wherever feasible, is the principal supplementary means of adding organic matter to the soil. It consists of the
growing of quick growing crop and ploughing it under to incorporate it into the soil. The green manure cropsupplies organic matter as well as additional nitrogen, particularly if it is a legume crop, which has the ability tofix nitrogen from the air with the help of its root-nodule bacteria. A leguminous crop producing 25 tones of greenmatter per hectare will add about 60 to 90 kg of nitrogen when ploughed under. This amount would equal anapplication of 3 to 10 tones of FYM on the basis of organic matter and its nitrogen contribution. The greenmanure crops also exercise a protective action against erosion and leaching. The most commonly used greenmanuring crops are: Sunhemp (Crotalaria juncea), Dhaincha (Sesbania aculeata), Cluster bean (Cyamopsistetragonoloba), Senji (Melilotus parviflora), Cowpea (Vigna catjang, Vigna sinensis), Berseem (Trifoliumalexandrium).
b) Concentrated Organic Manure: Concentrated organic manures are those materials that are organic in
nature and contain higher percentage of essential plant nutrients such as nitrogen, phosphorous and potash, ascompared to bulky organic manures. These concentrated manures are made from raw materials of animal or plant origin.The concentrated organic manures commonly used are oilcakes, blood meal, fishmeal, meat meal and horn and hoof
meal.
4. Waste:
Industrial waste: Among the industrial by products, spent wash from ditilisers and molasses and pressmud
from sugar industry have good manurial value. It is important to use only well decomposed pressmud at 10tones/ha. Addition of pressmud improves the soil fertility and enhances the activity of microbes. Coir waste is theby-product from coir industry and can be used as manure after proper decomposition.
Municipal and Sewage waste: It also forms an important component of organic waste. In India, the total
municipal refuse is about 12 mt/annum containing about 0.5% N, 0.3% P2O5 and 0.3% K2O. Sewage sludge isavailable to an extent of 4 million tones per annum containing 3% N, 2% P and 0.3% K (Bharadwaj and Gaur,1985). Sewage sludge particularly from industrialized cities is contaminated with heavy metals and these pose
hazards to plants, animals and human beings. Separation of the toxic waste at the source will minimize theconcentration of such elements in the sludge.
5. Biofertilizers:
It has been observed that there is decline in crop yield due to continuous apply of inorganic fertilizers. Therefore,increasing need is being felt to integrate nutrient supply with organic sources to restore the health of soil. Bio-fertilizeroffers an economically attractive and ecologically sound means of reducing external inputs and improving the quality andquantity of internal sources. Bio-fertilizer is microorganism's culture capable of fixing atmospheric nitrogen whensuitable crops are inoculated with them. The main inputs are microorganisms, which are capable of mobilizing nutritiveelements from non-usable form to usable form through biological process. These are less expensive, eco-friendly andsustainable. The beneficial microorganisms in the soil that are greater significance to horticultural situations arebiological nitrogen fixers, phosphate solubilisers and mycorrhizal fungi.
The Biofertilizers containing biological nitrogen fixing organism are of utmost important in agriculture in view of thefollowing advantages:
They help in establishment and growth of crop plants and trees.
They enhance biomass production and grain yields by 10-20%.
They are useful in sustainable agriculture.
They are suitable organic farming.
They play an important role in Agroforestry / silvipastoral systems.
Types of Biofertilizers: There are two types of bio-fertilizers.
1. Symbiotic N-fixation: These are Rhizobium culture of various strains which multiply in roots of suitable
legumes and fix nitrogen symbiotically. Almost 50% demands of N are met by these microorganisms in legumes.
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It is the most widely used biofertilizers, which colonizes the roots of specific legumes to form
tumours like growths called rot nodules. It is these nodules that act as factories of ammonia production. TheRhizobium legume association can fix upto 100-300 kg N/ha in one crop season.
2. Asymbiotic N-fixation: This includes Azotobacter, Azospirillium, BGA, Azolla and Mycorrhizae, which also
fixes atmospheric N in suitable soil medium. They grow on decomposing soil organic matter and produce nitrogencompounds for their own growth and development, besides that they leave behind a significant amount of N insurroundings.
Azotobacter: Application of Azotobactor has been found to increase the yields of wheat, rice, maize, pearl millet
and sorghum by 0-30% over control. The beneficial effect of Azotobactor biofertilizers on cereals, millets,vegetables, cotton and sugarcane under both irrigated and rainfed field conditions have been substantiated anddocumented (Pandey and Sushil Kumar, 1989). Apart from nitrogen this organism is also capable of producingantibacterial and anti-fungal compounds, hormones and siderophores.
Azospirillium: It is an important bacterium, which colonize the root zones and fix nitrogen in loose association
with plants. The crops which response to Azospirillum is maize, barley, oats, sorghum, pearl millet and foragecrop. Azospirillum applications increase gain productivity of cereals by 5-20%, of millets by 30% and of fodderby over 50%.
Blue Green Algae: The utilization of blue-green algae as biofertilizers for rice is very promising. Recent
researches have shown that algae also help to reduce soil alkalinity and this opens up possibilities for bio-reclamation of such inhospitable environments.
Azolla: A small floating fern, Azolla is commonly seen in low land fields and in shallow fresh water bodies. This
fern harbours blue-green algae, anabaena azollae. The Azolla anabaena association is a live floating nitrogenfactory using energy from photosynthesis to fix atmospheric nitrogen amounting to 100-150 kg N/ha/year fromabout 40-64 tones of biomass (Hamdi, 1982; Singh, 1988).
Mycorrhizae: Mycorrhizae are the symbiotic association of fungi with roots of Vascular plants. The main
advantage of Mycorrhizae to the host plants lies in the extension of the penetration zone of the root fungussystem in the soil, facilitating an increased phosphorous uptake. In many cases the Mycorrhizae have beenshown to markedly improve the growth of plants. In India, the beneficial effects of Vascular-arbuscularMycorrhizae (V AM) have been observed in fruit crops like citrus, papaya and litchi. Recent studies showed thepossibility of domesticating Mycorrhizae in agricultural system (Hayman, 1982; Tilak, 1987).
6. Bio-pesticide:
Bio-pesticides are natural plant products that belong to the so-called secondary metabolites, which include thousands of alkaloids, terpenoids, phenolics and minor secondary chemicals. These substances have usually no known function inphotosynthesis, growth or other basic aspects of plant physiology; however, their biological activity against insects,nematodes, fungi and other organisms is well documented.
Botanical insecticides are ecologically and environmentally safer generally affect the behaviour and physiology of insectsrather than killing them. Among the botanical pesticides investigated. Neem (Azadirachta indica) has justifiably receivedthe maximum attention. All parts of the Neem tree possess insecticidal property but seed kernel is most active.
Biopesticides and other preparations of plant origin used in agriculture seem to have a good scope especially in view of
the environmental problems being faced with the synthetic agrochemical. Some of the commonly used botanicalInsecticides are Nicotine, Pyrethrum, Rotenone, Subabilla, Ryanin, Quassia, Margosa, Acorus etc. Their used need to bepromoted under the Integrated Pest management Programmes.
7. Vermicompost:
It is organic manure produced by the activity of earthworms. It is a method of making compost with the use of earthworms that generally live in soil, eat biomass and excrete it in digested form. It is generally estimated that 1800worms which is an ideal population for one sq. meter can feed on 80 tones of humus per year. These are rich in macroand micronutrients, vitamins, growth hormones and immobilized microflora. The average nutrient content of vermicompost is much higher than that of FYM. It contains 1.60% N, 5.04% P2O and 0.80% K2O with small quantitiesof micronutrients. Application of vermicompost facilitates easy availability of essential plant nutrients to crop.
Preparation: Preparation of vermicompost has been described by Purkayastha and Bhatnagar (1997). A tank of 4 x l x lm is constructed with brick line in a shaded place. The bottom of the tank (about 5.0 cm) is made up of pieces of brick,stone chips and sand. This will facilitate easy drainage of water. Soil is spread over this to a thickness about 15cm.About 4-5 kg of diluted dung may also be applied. About 100 numbers of locally available worm species are placed overthe vermibed. It should be moistured without flooding. A layer of (about 10 cm) straw, leaves of plants, kitchen wasteetc are spread over this layer. This can be continued till the bed is completely filled. Liquid cowdung suspension is thenapplied and waste paper and bigger leaves are used to cover the contents in the tanks and finally the tank is fully
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covered with a gunny cloth. Watering the tank is very important nutrient sources in building up the soil fertility.Cowdung is an input in Biogas plants. The Biogas route has the dual advantage of providing both fuel (gas) and fertilizer(slurry). The residual slurry that comes out of the digestion tank has a manurial value superior to that of FYM. The wetslurry should not be used as such; it should be dried for usage as manure.
Conclusion: A large fraction of farm by-products of plant and animal origin is utilized for non-farm use i. e. for fuel orother domestic purposes. Small and scattered lands holding of the large farming community compel them to leave thecrop residue in the farm itself rather than recycle it for recycling. Lack of location specific technology to recycle organicwaste and lack of awareness to recycle organic waste in agriculture are the main reason for its slow adoption eventhough is a native technique for the farmers which got lost during the period of Green Revolution. So, in order topopularize this eco-friendly farming practices like organic farming we have to give attention to strengthen the production
of good quality organic manure, bio-pesticides, biofertilizers and green manuring crops, discourage the indiscriminateuse of inorganic fertilizers and pesticides, development of pesticides of plant origin (such as Neem) and use of agentsespecially under integrated Pest Management system as well as steps to reduce hazardous chemical residues in seeds,fodder, food products and milk.
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Source: Journal of the North Eastern Council: Chandan Deka, Shantanu Kumar and Adity
