State three factors to be considered before the application of
fertilizer to crops.

Explanation:

1.Soil Supplying Power:

Fertilizer application and addition of crop residues. The available nitrogen and potassium in soil after groundnut are higher to initial status of the soil. But after pearl millet, only potassium status in the soil is improved and no changes in P.

2. Nutrient Uptake by Crops:

The total amount of nutrients taken by the crops in one sequence gives an indication of the fertilizer requirement of the system. The balance is obtained by subtracting the fertilize applied to crops that nutrient taken by the crops.

3.Pest and Diseases:

Pest and diseases infestation more in sequence cropping due to continuous cropping, carry over effect of insecticides is not observed.

There are several factors to consider when choosing fertilizer application methods. Considerations include: the particular mixture of nutrients needed, the crop, timing of application, available equipment, and planting/tillage practices.

Explanation:

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