Author(s)

Ashfaq Ahmad, Amjed Ali, Tasneem Khaliq, Syed Aftab Wajid, Zafar Iqbal, Muhammad Ibrahim, Hafiz Muhammad Rashad Javeed, Gerrit Hoogenboom

Agro-Climatology Lab, University of Agriculture, Faisalabad, Pakistan;.
College of Agriculture, D. G. Khan, Pakistan;.
NFC Institute of Engineering and Technology, Multan, Pakistan;.
University College of Agriculture, University of Sargodha, Sargodha, Pakistan;.
Washington State University, Pullman, USA..

The experiments were conducted to evaluate the performance of crop system (DSSAT) OILCROP-SUN model simulating growth & development and achene yield of sunflower hybrids in response to nitrogen under irrigated conditions in semi arid environment, Sargodha, Punjab. The model was evaluated with observed data collected in trials which were conducted during spring season in 2010 and 2011 in Sargodha, Punjab, Pakistan. Split plot design was used in layout of experiment with three replications. The hybrids (Hysun-33 & S-278) and N levels (0, 75, 150 and 225 kg^.ha^-1) were allotted in main and sub plots, respectively. The OILCROP-SUN model showed that the model was able to simulate growth and yield of sunflower with an average of 10.44 error% between observed and simulated achene yield (AY). The results of simulation analysis indicated that nitrogen rate of 150 kg^.N^.ha^-1 (N₃) produced the highest yield as compared to other treatments. Furthermore, the economic analysis through mean Gini Dominance also showed the dominance of this treatment compared to other treatment combinations. Thus management strategy consisting of treatment 150 kg^.N^.ha^-1 was the best for high yield of sunflower hybrids.

Decision Support System for Agro-Technology Transfer; Nitrogen; Achene Yield; Crop Modeling

A. Ahmad, A. Ali, T. Khaliq, S. Wajid, Z. Iqbal, M. Ibrahim, H. Rashad Javeed and G. Hoogenboom, "OILCROP-SUN Model Relevance for Evaluation of Nitrogen Management of Sunflower Hybrids in Sargodha, Punjab," American Journal of Plant Sciences, Vol. 4 No. 9, 2013, pp. 1731-1735. doi: 10.4236/ajps.2013.49212.