Water Management in Agriculture

Water Management in Agriculture

the Performance of the Aquacrop Model under Deficit and Saline Irrigation Management of Rice

Authors
1 Department of Water Engineering, Lahijan branch, Islamic Azad University, Lahijan, Iran
2 Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
3 Ph. D. Candidate, Young Researchers and Elite Club, Arak Branch, Islamic Azad University, Arak, Iran
Abstract
This study conducted in order to assess accurate of Aquacrop Model in yield grain and Biomass simulation under rice(Hasham cultivar) deficit and saline irrigation management conditions in Rasht Rice Research Institute of Iran, during two year from 2009-2011. This experiment was conducted in form of factorial randomized complete block design with 3 replications. Treatments consisted of 4 levels of salinity as follows: S1, tap water with salinity less than 1 dS m, S2, S3, S4, respectively salinity of 2, 4, 6 dS m and five irrigation methods include I0: Irrigation continuous, I1, I2, I3, I4, respectively, in water saturation (AWD), irrigation at field capacity (FC), irrigation water content of 100, 90 and 80% of field capacity. AquaCrop model was evaluated for rice under deficit and salinity stress. Measured data of first and second year were used to calibrate and validate respectively. the root mean square error (RMSE), normalized root mean square error (RMSEn), the percentage relative error and test (T-test) was used in order to comparing simulation results with measured data. Grain yield was simulated with lower the threshold 0.85 and 9% to 0.43 and 33% in the model simulation results show that Model has acceptable performance in salinities less than the threshold salinity.
 
Keywords

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