Estimation of genetic coefficients and evaluation of OILCROP-SUN model under different levels of nitrogen fertilizer

Subject Areas : Farm water management with the aim of improving irrigation management indicators

Mina Kiani ¹ (M.Sc., Water Engineering Department, College of Agriculture, Isfahan University of Technology, Isfahan, Iran)
Mahdi Gheysari ² (Assistant Professor, Water Engineering Department, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran)
Behrouz Mostafazadeh-Fard ³ (Professor, Water Engineering Department, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran)

Received: 2012-12-06 Accepted : 2013-03-14 Published : 2013-06-21

Keywords: DSSAT software, euroflor, nitrogen fertilizer, sunflower crop model,

Abstract :

Crop models are appropriate and low-cost tools for investigating the effect of agricultural inputs on water and soil resources and crop production. The objective of this study was to evaluate the OILCROP-SUN model for Euroflor hybrid of sunflower in order to gain a suitable base to conserve soil and water resources. This study was conducted as a strip-plot statistical design with randomized complete blocks design with three replications for each treatment. Total biomass, seed weight, seed yield, percentage of seed oil, and seed nitrogen were measured. Using collected field data, OILCROP-SUN model was calibrated and evaluated for different levels of water and nitrogen applications. Six genetic coefficients were then derived from calibration of OILCROP-SUN model for Euroflor hybrid. The results indicated that seed yields were simulated reasonably well for 12 treatments with NRMSE value of 18.5%, and the d-index of 0.92. The d value of different treatments of water and nitrogen for seed nitrogen was 0.93, and for oil production per hectare was 0.91.