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| DOI：10.13522/j.cnki.ggps.2022317 |
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| Impacts of Rainwater Storage Irrigation on Farmland Nutrients and Rice Growt |
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YE Hao, HUANG Bishan, XIONG Wei, WANG Shubin
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1. Tianmen Experiment Station of Farmland Irrigation and Drainage, Tianmen 431700, China;
2. Tianmen Bureau of Water Resources and Lakes, Tianmen 431700, China
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| Abstract: |
| 【Objective】To provide scientific basis for rain storage irragaition, the trail explored the effect of rain storage irrigation on farmland nutrients and crops.【Method】Under natural conditions, shallow water frequent irrigation was the control, based on shallow water frequent irrigation, three kinds of rain storage upper limits (TR1, 100 mm; TR2, 80 mm; TR3, 60 mm) were designed to study impacts of rainwater storage irrigation on farmland nutrients and rice growth. 【Result】①Rain storage irragation has no effect on available nitrogen, available phosphorus, available potassium at the level of 5% in soil nutrients of 0~20 cm (surface soil) and 20~40 cm (deep soil); ②The available nitrogen of surface soil of TR1—TR3 was 20.0% higher on average than that of the deep soil; the available phosphorus of surface soil was 85.0% higher than that of the deep soil; the available potassium of surface soil was 66.8% higher than that of the deep soil. With the change of growth period, the available nitrogen of surface soil of the rain storage irrigation treatment decreased gradually, and the deep soil increased gradually. Available phosphorus of surface soil and deep soil gradually increased; available potassium of surface soil and deep soil decreased gradually; ③There was no significant difference in effective tillering, panicle length, seed setting rate and 1 000-grain weight among the four treatments at the 5% level. 【Conclusion】Rain storage irrigation can increase surface available nitrogen, available phosphorus and available potassium, and 80 mm rain storage has the best comprehensive benefit. |
| Key words: rice; agronomic indicators; rain storage irrigation; soil nutrient |
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