Effects of Slow-release Fertilizer on Growth,Yield and Water Use of Rice Under Rain-storing Intermittent Irrigation
In order to explore the water-saving and high-yielding benefits of slow-release fertilizers for rice under the rain-storing intermittent irrigation mode,a bucket test experiment was conducted to investigate the growth characteristics,yields and water consumption of rice under different water and fertilizer treatments in the Zhanghe irrigation district of Hubei province.The growth characteristics,yield and water use of rice under different treatments were studied under 2 irrigation modes(traditional flooding irrigation,W1;rain-storing intermittent irrigation,W2)coupled with 2 fertilization types(traditional fertilizer,N1;slow-release fertilizer,N2).The results showed that the combination of rain-storing intermittent irrigation and slow-release fertilizer had an inhibitory effect on tillers in the early and middle stages of rice growth,which effectively controlled ineffective tillers.The drought and flood stress had significant inhibitory effect on the height of rice plants,and the final yield showed no significant difference under the same irrigation mode and fertilizer type.However,under the slow-release fertilizer treatment,rain-storing intermittent irrigation reduced water usage by 38.39%,reduced the number of irrigations by 9 times,reduced drainage by 56 mm,increased rainwater utilization efficiency by 13.82%,reduced water consumption by 23.68%,and increased water use efficiency by 37.98%and irrigation water use efficiency by 73.28%.Above results showed that the combination of rain-storing intermittent irrigation with slow-release fertilizer could stabilize rice yields,reduce irrigation and drainage volume and frequency,improve rainwater and water use efficiency,and have good water saving and yield increase effects.
rain-storing intermittent irrigationslow-release fertilizerricegrowth characteristicyieldwater use efficiency
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