Evaluation of Aquacrop Model for predicting wheat yield indifferent fertilizer managments
Subject Areas :Mohammad Reza Emdad 1 , Arash Tafteh 2
1 - Irrigation and soil physics department, SWRI, Karaj Iran
2 - Irrigation and soil physics department, SWRI, Karaj.Iran
Keywords: Wheat, Fertilizer management, Yield simulation, Crop model,
Abstract :
Lack of supply fertilizer (on time and sufficient quantitities) affects wheat yield. On the other hand, in most of the Khozestan soils, soil organic carbon is very low and ferilizer managment is very poor. The climatic data required in Aquacrop model was collected from sinoptic metereological wheather station of Ahvaz. In this research, to different fertilizer management inclouding regular fertilizer management by farmer and non-limited fertilzer for whaet production has been considered. Based on farm management and phenological stage of wheat plant, grain yield is measured and compared with the results that simulated by Aquacrop model. in the first year, effect of different fertilizer management( optimal nutritional condition) and farmer fertilizer management in three pilots of hamidiyeh was investigated. After that simulation and validation of data has been conducted using Aquacrop model. In the second year two fertilizer management inclouding farmer and non-limited fertilizer management were used for data verification and compaired with that resulted in first year. The average wheat yeild in regular fertilizer that measured and simiulated by Aquacrop model were about 2.7 and 2.6 ton/h respectively. Data simulation of wheat yield showed a close results with measured data in field condition. The results of second year showed that in non-limited fertilizer condition, the wheat yield in measured and simulation condition by Aquacrop are 4.5 and 4.3 t/h respectively(with 5%Error). These results demonstrated that Aquacrop model has high performance and ability for crop yeilds simulation in different fertilizer managements.
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