Soils require high fertilizer inputs to replace the nutrients removed by cropping. The soil holds the applied nutrients or else, looses them through soil erosion, leaching or volatilization as a gas. Therefore, much attention is given to efficiency of fertilizer recovery, which is dependent on many factors, and the ,major ones being the weather, soil type, site characteristics and agronomic practice. recently, the fertilizer recommendation system developed at PORIM is being verified and validated using fertilizer verification block network. The effort is to improve the fertilizer recommendations system by applying the most reliable equations with inclusion of more recent information from the fertilizer verification block network.

Main Research: Tarmizi A. M