Abstract
Abstract The objective of this paper has been to develop a model for nitrogen(N) fertilizer rate forecasting for corn crop (Zea mays L.) based on plant available soil water (PAW) and precipitation. Crop N requirements, soil organic matter, N supplying capability of soil, or initial soil nitrate were used as the basis for N fertilizer recommendations. Often a standard average N rate is recommended for a specific area, irrespective of stored soil water and rainfall conditions of actual year. Long‐term experiments carried out at the same site (soil and field) in south central Romania have shown a wide variation in yield, optimum N rate, and N fertilizer efficiency over the years. No study was done in this area to forecast N fertilizer rate based on soil water. Since both precipitation and soil water have a paramount effect on organic matter mineralization and on mineral N behavior in soil, the PAW in March 1st, June 1st and June precipitation, at the time of N fertilizer application, were taken into account ...
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