PJB-2018-1593
Prediction of growth and yield of different wheat varieties under rainfall condition by AquaCrop program
Akram Abbas Khalaf and Fathi Abdulkareem Omer
Abstract
The experiment was conducted at the research farms of the college of Agriculture, University of Duhok, Iraqi Kurdistan Region during the growing season 2015-16, consisting of three wheat varieties (Abu-Graib, Al-Rashid and Sham-6) cultivated under rainfed (RF) condition. The AquaCrop model was calibrated with experiment generated data sets of 2015-16. The results revealed that the maximum measured and model simulated production parameters were obtained from Sham-6 wheat variety; 4.540, 4.923, 10.735, 9.569 and 15.275, 14.492 ton/ha for the production parameters of grain yield, dry matter and biomass of the wheat varieties respectively. On the other hand, the minimum values of same parameters were obtained from Abu-Graib variety of wheat which were (3.418, 3.566), (6.982, 7.795) and (10.400, 11.361) ton/ha for both measured and simulated values excluding the simulated dry matter which was found by AL-Rashid wheat variety. It was also observed that the model predicted grain yield, dry matter, and biomass yield by AquaCrop model was with prediction error of 4.33%, 21.3% and 8.43%; for grain yield and dry matter of 11.64%, 17.47% and 10.86% for Abu-Griab, Al-Rashid and Sham-6 wheat varieties respectively. At the same time the model predicted error of biomass and it was noticed that the maximum percentage was obtained from Abu-Graib wheat variety which was 9.24% while the minimum value of error percentage found in Sham-6 variety was 5.10%.
Moreover, relationships between the model simulated and observed grain yield, dry matter and biomass yield was observed that the R2 (coefficient of determination) for grain yield was 0.844, whereas R2 for dry matter and biomass were 0.561and 0.864 respectively. Water productivity of wheat varieties was observed that the highest crop water productivity for grain yield, dry matter and biomass was found by Sham-6 variety and for both measured and model simulated values, while the lowest values were obtained by Abu-Graib and Al-Rashid varieties. It was demonstrated that highest value of Harvest Index ( HI) was found in Sham-6 wheat variety for both measured and simulated values which were 0.297 and 0.340 respectively, whereas the lowest (HI) value was obtained from Abu-Graib variety and for both measured and model simulated during the wheat crop growth of 2015-16.
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