Question

Green manure plants used by farmers mainly belong to_ _ _ _ _ _ _ _ _
A. Compositae
B. Leguminosae
C. Solanaceae
D. Poaceae

Answer 1

Hint:Green manure plants are known to be cover of soil which are grown in crop plants to nourish the soil with nutrients and increase the fertility of the soil. Therefore we can define plants that are grown for green manure and are extensively known as green manure plants.

Complete answer:
Green manure plants are the plants that are known to be fast growing in the fields, these are the herbaceous plants belonging to the family Leguminosae. These plants are ploughed down and are mixed with soil to grow at a faster rate.
These are the best manure plants because they contain symbiotic nitrogen-fixing bacteria found mainly in root nodules which fixes the atmospheric nitrogen to enrich the soil with nitrogen. These plants are known to provide nitrogen and organic matter to enrich the soil and provide the crop plants with these. They are known to be beneficial because they provide organic matter and nitrogen which lack mostly in the Indian soils. These leguminous plants are known to act mainly as soil acidifying plants because they cause the reduction of alkalinity of soil by producing humic acid and acetic acid.
Some of the important plants of the Leguminosae include Alhagi and Crotalaria I.e sunn hemp.
These plants produce their effects by helping soil increase the area of soil, its water holding capacity, and thereby also the fertility of the soil. Some green manure plants also decrease the pests and insects of the crop plants. They can also be fed to the grazing animals in our domestic farms.

So, the correct answer to this question is the option"B".

Note: Green manure plants are dug before growing of the crop plants and dug deep down in the soil to increase the fertility of the soil. They produce a dense mat of green growth over the soil in the crop fields helps in atmospheric nitrogen fixation. Therefore they have many advantages for the farmers in their fields.