Question

Ramlal has been cultivating wheat crop year after year in the same field. Recently he has observed decline in the yield despite best inputs. Agriculture inspector of the area suggested him to sow legume crop (e.g., pea, chick pea or soyabean) for one or two years before again using the field for wheat crop. What is the logic behind this suggestion?

Answer 1

Conclusion :

Legume improve the soil fertility and Nitrogen biological fixation

Explanation:

If someone used to grow the one crop year by year the soil fertility reduce and production of crop will decrease year by year.

Agriculture inspector advised the Ramlal to change the wheat crop by legumes because in the root of legumes, rhizobium bacteria are present which improve the soil texture, nutrients and convert the atmospheric nitrogen to the ammonia and it is used by the host plant as fertilizers so the after 2 to 3 years Ramlal can grow wheat crop and the production will improve from the previous.

Benefits of legume crops :-

1. Improve soil texture
2. Nitrogen biological fixation
3. Improve soil fertility
4. Reduce $CO_2$ and  $NO_2$ emission.

Answer 2

Conversion of Nitrogen

Explanation:

1. Leguminous plants changes over climate nitrogen in to nitrogen componts and blends in with soil.  
2. As we as a whole know very well that nitrogen is significant for plant development.
3. Here the assessor advised to plant leguminous plants to hold land ripeness.  

The key that leguminous plants changes over barometrically nitrogen into nitrogen componts is utilized here.