Explanation:

i thinks letter A (^_^)

Answer:

Nitrogen The plant food that the farmers should apply when the crop begins to ripen is.

Modern agriculture is under pressure of two contradictory challenges reflected by the increasing world’s population on one hand, and the magnitude of food production, on the other hand.

The complexity of agricultural impact on human life and the increasing awareness of environmental threats was the boosting argument for elaborating a concept of sustainable agriculture growth.

The efficient allocation of production means for improving yields and securing the environment, requires a deep insight into processes responsible for crop's productivity. It is well recognized, that crop plant development during the growth season is controlled by numerous factors, both depended and independent on farmer’s activity.

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