Answer:
The prepare the soil.
Explanation:
Because the plants use the nutrients and minerals that are present in the soil in their process of growth. Feeding the stalks to the cows means that whatever nutrient is in the stalks are mostly going to be used by the cows so in order to be able to grow another crop, the soil needs to be supported with additional nutrients, minerals and elements.
I hope this answer helps.
The nitrogen and phosphorus are not present in large quantity within the soil, so after harvesting for new crops more nitrogen and phosphorus are required.
• Plants get nitrogen from the process of nitrogen fixation. In the process, fixation of atmospheric nitrogen is done, which is further used up by the plants.
• At the time of harvesting, the topsoil containing nitrogen is removed. Apart from this, clearing forests and grasslands for planting crops by burning them also removes nitrogen from the soil.
• Similar to nitrogen, phosphorus is also required for optimum growth by the plants, however, normal soil does not comprise adequate amount of phosphorus.
• By human activities, and by the process of erosion, phosphorus get eroded from the soil.
• Therefore, after harvesting, when new crops are grown, farmer first use fertilizers, which are rich in phosphorus and nitrogen and enrich the soil with it, as after harvesting the soil is devoid of these essential nutrients and plants need these nutrients for optimum growth.
Thus, to enrich the soil again with phosphorus and nitrogen farmers add fertilizers before growing another crop.
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