Question

cultivation of which of these plants would reduce the requirement of nitrogen fertilisers in the field ​

Answer 1

Explanation:

Building Up Total Soil Nitrogen

The key to increasing soil nitrogen is to increase soil carbon by increasing the SOM levels. A typical soil is supposed to be 25 percent air, 25 percent water, 45 percent mineral and 5 percent soil organic matter. The primary reason for good soil aeration is to get oxygen into the roots.

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Answer 2

Answer:

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Wheat

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Wheat nutrition and fertilizer requirements – nitrogen

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Effect of Nitrogen on Wheat GrowthNitrogen Deficiency SymptomsCrop Yield and Protein Response to Increasing Rates of Applied NitrogenEffect of Split Application vs. Single Applications of Nitrogen on Yield and Protein ContentNitrogen SupplyFactors Influencing Wheat Response to Nitrogen FertilizerNitrogen Immobilization and LossesNitrogen Fertilizer Placement and Time of Application

Adapted from the Canada Grains Council's Complete Guide to Wheat Management

Effect of Nitrogen on Wheat Growth

Nitrogen (N) is often the most deficient of all the plant nutrients. Wheat is very sensitive to insufficient nitrogen and very responsive to nitrogen fertilization.

The most important role of N in the plant is its presences in the structure of protein, the most important building substances from which the living material or protoplasm of every cell is made. In addition, nitrogen is also found in chlorophyll, the green colouring matter of leaves. Chlorophyll enables the plant to transfer energy from sunlight by photosynthesis. Therefore, the nitrogen supply to the plant will influence the amount of protein, protoplasm and chlorophyll formed. In turn, this influences cell size and leaf area, and photosynthetic activity.

Plants grown with an adequate supply of nitrogen make rapid and thrifty growth and are dark green in colour. Leaf and stem development is stimulated. Insufficient nitrogen results in lighter green colour, reduced tillering, and disturbance of normal cell growth division, and a decrease in rate, and extent of protein synthesis. Because of this crop yields may also be greatly reduced. Excessive nitrogen causes lush succulent growth, resulting in greatly increased danger of lodging, delayed maturity and greater susceptibility to diseases such as rusts, septoria and powdery mildew.

Plants contain more nitrogen than any other essential elements derived from the soil. Plants take up nitrogen from the time the roots begin to function until all uptake of nutrients ceases with maturity. However, the largest amounts are taken up during early stages of growth, held for later use and translocated within the plant where needed, for example, to the kernels from the leaves and stem during maturation.

On average a 40 bu/ac wheat crop at maturity will contain approximately 95 kg/ha (85 lb/ac) of nitrogen in the seed and straw.

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