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| Effects of no-tillage and straw returning on yield and water use of direct seeding rice |
| LI Guoqi1, WU Han1,2* |
| 1. Irrigation Experiment Central Station of Pishihang Irrigation District of Anhui Province, Lu′an, Anhui 237158, China; 2. College of Agronomy, Anhui Agricultural University, Hefei, Anhui 230036, China |
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Abstract A experiment was performed to investigate the effects of four treatments:CT+NS(conventional tillage + no straw return), CT+S(conventional tillage + straw return), NT+NS(no-tillage + no straw return), NT+S(no-tillage + straw return)on rice yield and water utilization of direct seeding rice in 2017 and 2018. The experimental results showed that the yield of direct seeding rice under NT+S is 9.08-9.63 t/hm2, which was not significant difference with CT+NS and CT+S, but it is significantly increased by 10.05%-13.36% compared with NT+NS. Therefor, compared with CT+S, the water demand of NT+S has decreased significantly by 5.17%-7.24%, reaching 557.3-576.7 mm. However, the water demand of NT+NS is not significantly different from that of NT+S. Moreover, NT+S has the highest water productivity, 1.63 kg/m3 and 1.67 kg/m3 respectively in two years, which is a significant increase of 12.90% and 11.56% compared with NT+NS. In addition, the water productivity of CT+NS is significantly lower than that of NT+S in 2017, but no significant difference in 2018.
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Received: 04 March 2021
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