Effects of different irrigation-fertilization combinations on rice yield, water use and Non-point pollution discharge in typical hilly land of Southern China

3rd International Conference on Energy Engineering and Environmental Protection

能源学;生态环境科学

Lu, Cheng^1 ; Xiao, Menghua^1 ; Qiu, Xinkai^1

Zhejiang Institute of Hydraulics and Estuary, Hangzhou

310020, China^1

关键词: Basin irrigations;    Intermittent irrigations;    Irrigation quotas;    Multi objective decision models;    Nonpoint pollutions;    Optimal methods;    Water productivity;    Yield-increasing;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/227/5/052017/pdf
DOI  :  10.1088/1755-1315/227/5/052017

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The effects of different irrigation-fertilization combinations on single cropping rice yield, water use and non-point pollution discharge were investigated in field experiment. The result demonstrated that, the average water demand, leakage, irrigation quota and water productivity of intermittent irrigation (II) and rainfall-collect intermittent irrigation (RCII) were 10.9%, 45.2%, 49.0% and 97.7% lower than those of basin irrigation (BI) (P0.05). The yield and water productivity of three-time fertilization (3TF) were 4.1% and 4.8% higher than two-time fertilization (2TF) (P 3 --N and NH4+-N discharges of II and RCII were reduced 1.0% and 55.7% respectively compared with BI, while the NO3 --N and NH4+-N discharges of RCII were reduced 1.0% and 67.6% than II; the NO3 --N and NH4+-N discharges of 3TF were reduced 1.0% and 10.2% than 2TF. The optimal method of irrigation-fertilization combination was revealed by using the multi-objective decision model of entropy TOPSIS, the results indicated that, RCII combined with 3TF could optimize the effects of yield-increasing, water-saving, pollution-decreasing and fertilizer-conservation.