10 May Management of fertilizers in soil
मिट्टी में उर्वरकों का प्रबंधन The fertilizers are becoming costly input day by day. Hence it is felt necessary to study the efficient use of this input. So some important points are given here to increase fertilizer use efficiency and to get higher yield. 1. Management of Nitrogen fertilizers in soil Nitrogen is lost from fertilizers by ways as follows: Volatilization Ammonia volatilization is an economic loss to the farmer in terms of both drained fertilizer prices and decreased crop yields. Some important facts are as follows: The ammonia volatilizing capacities of the fertilizers are graded as urea > ammonium sulphate > ammonium chloride > ammonium nitrate. The ammonia volatilizing capacities of the soils are graded as calcareous soil > alkaline soil > neutral soil > acid soil. In neutral and acid soils, ammonia volatilization occurs from urea only, not from other ammonium fertilizer viz. ammonium sulphate, ammonium chloride, ammonium nitrate. Surface application of fertilizers increases ammonia volatilization. Ammonia volatilization from urea added to the surface of warm and moist alkaline or calcareous soils can be completed within a week. To reduce volatilization loss of nitrogen, few recommendations are enlisted hereunder. Immediately after application (within a few hours), urea must be incorporated with soil by tillage or washed into the soil. Urea should never be left on the soil surface without incorporation. In...