Effects of Irrigation Amount and Planting Density on Yield and Water Use Efficiency of Rice under Film Mulching Drip Irrigation in Hexi Irrigation District
1st author: gstwx@163.com
Received date: 2024-09-26
Online published: 2025-03-12
This study aims to explore the effects of different irrigation amounts and planting densities on the yield, water consumption, and water use efficiency of rice under film drip irrigation, and to determine the optimal combination of irrigation amount and planting density that can synergistically increase yield and water use efficiency. A split-zone design method was used, with the main treatment being the irrigation amount, set at three levels: 750.0 mm (W1), 975.0 mm (W2), and 1200.0 mm (W3); and the sub-treatment being the planting density, set at three levels: 364 000 hills/hm2 (D1), 444 000 hills/hm2(D2), and 571 000 hills/hm2(D3). The results showed that rice yield, water consumption, and water use efficiency were all affected by irrigation levels, planting density, and their interactive effects. In terms of yield, the treatments of W2 and W3 had similar yields, which were significantly higher than W1 by 35.66% and 36.86%, respectively. Compared to D1 and D2 treatments, the yield of D3 treatment was significantly increased by 60.54% and 12.79%, respectively. High-density planting combined with medium to high irrigation amounts (W2D3 and W3D3 treatments) could result in higher rice yields. Water consumption of W2 treatment was significantly increased by 26.69% compared to W1 treatment, but was significantly decreased by 17.13% compared to W3 treatment. Although D3 treatment had the highest water consumption, it was only 1.63% and 1.47% higher than D1 and D2 treatments, respectively. The treatments of W3D1, W3D2, and W3D3 had higher water consumption, indicating that irrigation amount is the main factor affecting rice water consumption. The water use efficiency of W2 treatment was 4.02 kg/(hm2·mm), which was 6.91% and 20.00% higher than W1 and W3 treatments, respectively. The water use efficiency of D3 treatment was 4.31 kg/(hm2·mm), which was 52.30% and 8.02% higher than D1 and D2 treatments respectively. Among all treatment combinations, W1D2, W2D3, and W3D3 treatments had the highest water use efficiency, with values of 4.45, 4.87, and 4.41 kg/(hm2·mm), respectively. When the irrigation amount was 975.00 mm and the planting density was 571 000 hills/hm2, both rice yield and water use efficiency reached a high level.
TANG Wenxue, MA Zhongming, XUE Liang, LIAN Caiyun, WANG Zhiqi, LUO Shuanglong . Effects of Irrigation Amount and Planting Density on Yield and Water Use Efficiency of Rice under Film Mulching Drip Irrigation in Hexi Irrigation District[J]. China Rice, 2025 , 31(2) : 76 -82 . DOI: 10.3969/j.issn.1006-8082.2025.02.013
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