Effects of different irrigation-fertilization combinations on rice yield, water use and Non-point pollution discharge in typical hilly land of Southern China
Year: 2019
Type: conference-paper
Abstract: 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) ( P < 0.01), while II and RCII did not show a significant difference on those parameters ( P > 0.05). The yield and water productivity of three-time fertilization (3TF) were 4.1% and 4.8% higher than two-time fertilization (2TF) ( P < 0.05). The interaction of water and fertilizer on yield achieved 40%, which showed positive influence. The average NO 3 - -N and NH 4+ -N discharges of II and RCII were reduced 1.0% and 55.7% respectively compared with BI, while the NO 3 - -N and NH 4+ -N discharges of RCII were reduced 1.0% and 67.6% than II; the NO 3 - -N and NH 4+ -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.
Authors: Cheng Lu, Menghua Xiao, Xinkai Qiu
Institution: Zhejiang Institute of Hydraulics & Estuary
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: diamond
OpenAlex ID: W2919907307