Green manuring,Practices and Crops used in Green manuring
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Chemical weed control
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use of herbicide for controlling of weeds. their use benefits and demerits. and impact on human beings.
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This document presents a summary of several classical theories on plant growth response to nutrients:
1) Liebig's Law of the Minimum states that plant growth is limited by the scarcest nutrient.
2) Blackman's Law of the Limiting Factor states that the growth rate is determined by the slowest acting growth factor.
3) Willcox's Theory of the Nitrogen Constant found plants absorb about 318 lbs of nitrogen per acre at optimum conditions.
4) Spillman's Equation models the relationship between growth amount, maximum possible yield, growth factor quantity, and a constant.
5) Baule Unit defines the amount of nitrogen, phosphorus, or potassium needed to produce 50% of maximum possible
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Green manuring is the practice of enriching soil fertility by plowing under or incorporating green manure crops into the soil while still green or soon after flowering. It improves soil structure and fertility by adding nutrients like nitrogen. Common green manure crops in India include dhaincha, glyricidia, and karanja, which are plowed under at the flowering stage. The benefits of green manuring include increased organic matter, improved soil structure, increased nutrient availability and crop yields. Proper timing and crop selection is important for effective green manuring.
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Green manuring is the practice of growing green plants or adding plant materials and incorporating them into the soil to improve soil structure and fertility. There are two main types - green leaf manuring, which involves collecting and adding leaves and twigs from elsewhere, and green manuring in situ, which involves growing plants like legumes and incorporating them into the soil before or at flowering. Green manuring benefits the soil by increasing nitrogen levels, improving soil structure and water retention, reducing erosion, and reclaiming saline or alkaline soils. Common green manure crops include sunn hemp, dhaincha, sesbania, and clusterbeans.
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Green manuring is the practice of plowing green plant materials into the soil to improve soil structure and fertility. There are two types of green manuring: green leaf manuring, which involves collecting and incorporating leaves and twigs from outside sources, and green manuring in situ, which involves growing and plowing under leguminous crops. Green manuring contributes nitrogen to the soil, prevents nitrogen loss, improves soil structure and water retention, and can reclaim saline or alkaline soils. Common green manure crops include sunn hemp, dhaincha, sesbania, and clusterbeans, as they are fast-growing legumes that decompose quickly and add nutrients to the soil without competing with main crops.
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- 2. What is green manuring ? – Green manuring Is defined as the growing of green manure crops and then turning off these crops directly in the field by ploughing the field so as to make the field richer In nitrogen which is most deficient nutrient of the soil
- 3. Advantages of green manuring – It will lead in building the soil structure and improving the soil physical properties like soil aeration, water holding capacity of soil, soil bulk density – This will also help in bringing the nutrient into the upper layer so that they should become available for the plant absorption from the lower layer
- 4. Advantages of green manuring(cont. …) – Green manuring also fulfils the crop need of nitrogen which is the most deficient nutrient in the soil these days – It will also increase the soil availability of different micro and macro nutrient like those of calcium , phosphorus, potash and magnesium
- 5. Green manuring crops – There following crops are the manuring crops which are explained
- 6. • Crotolaria joncea(sunnhemp) – It is a green manuring crop with vigorous cropping habits. And it does not with stand the waterlogging – Its seed rate is 25-30 kg per hectare – It is incorporated into the soil after the period of 9 or 10 weeks of sowing
- 7. Green manuring crops(cont.…) – The quantity of nitrogen fixed by this crop is very good for i.e. 80 to 130 k.g/ha – It contains about 2.80 to 3.15 % nitrogen content
- 9. Cassia pistula – It is weed which is used for green manuring – It contains 0.75 to 1.25% nitrogen contents in it – Its stems and leaves are used for green manuring when the plant is in the flowering stage
- 11. Cowpea or vigna sinensis – It fixes about 200 kg nitrogen per hectare in the soil due to symbiotic nitrogen fixation by rhizobium
- 13. Green gram or vigna radiata – It fixes about 25 kg nitrogen per hectare in the soil which very high in regards that you can also obtain a good production of a green gram as well
- 15. Berseem or trifoilium alexandrinum – The fodder crop of Berseem fixes abou 280 to 350 kg nitrogen per hectare – Some of the other legume green manuring crops are soybean, alfa-alfa , clusterbean which also fixes effective nitrogen from the atmosphere into the soil by the process of symbiotic nitrogen fixation by a bacterium named rhizobium