Question

(b) The grassland is ploughed up and turned into farmland. Crops of maize are grown on it

Answer 1

Answer:

the more corn grown the less nitrogen there will be in the soil thus the more corn grown the worse the yield will be

Explanation:

the farmer needs to alternate between fields to allow the soil to return to normal

Answer 2

Answer:

1.

i. Effect on the nitrogen cycle

will go on smoothly

ii. Effect on crop yield  

will reduce

2.

Farmer must do crop rotation in alternate season

Explanation:

1.

Effect on the nitrogen cycle

Crop rotation is essential to restore the nitrogen content of the soil. Generally in one season a non leguminous crop is grown while in the other season a leguminous crop is grown. Leguminous crop allows the nitrogen with in the soil to be restored by the rizhobium bacterium. Since here only maize is grown year after year,  the nitrogen cycle will go on smoothly.

Effect on crop yield

Crop yield will decrease as if same kind of crop is grown again and again,  it causes depletion of essential soil and mineral from the soil and since crop change is not done thus no time is even allowed for restoration of such crops. Hence, crop yield will decrease ultimately.

2.

Crop rotation must be done and some leguminous crops can be grown in alternate seasons to enhance the crop yield.