Study on the Effects of Controlled-release Fertilizer on Rice Traits and Yield and Optimal Application Rates
In order to determine the optimal application amount of special controlled-release fertilizer(32-13-6)on dry direct seeding rice(water after sowing),Ningjing 43 was used as the test material,and four gradients of the application amount of controlled release fertilizer were set at 35 kg/667 m2,40 kg/667 m2,45 kg/667 m2 and 50 kg/667 m2.The results showed the following:① the yield of rice after applying controlled release fertilizer was higher than that of conventional application of chemical fertilizer(CK),with an increase of 0.82%～6.58%,and a fertilizer saving rate of 19.93%～37.72%.Under the experimental soil capacity condition,the recommended dosage of controlled release fertilizer was 41.0 kg/667 m2,and the corresponding yield was 783.12 kg/667 m2,with an increase rate of 40.46 kg/667 m2 compared to CK.② Plant height,panicle length,number of grains per panicle,and percentage of unfilled grains were significantly positively correlated with fertilizer application rate,while yield per mu(unit of land area)and thousand-grain weight were less correlated with it.③ Compared to CK,the controlled-release fertilizer treatment resulted in a reduction in nitrogen input by 0.62%～30.44%,phosphorus input by 8.45%～35.92%,and potassium input by 0～30.0%.However,the content of available nitrogen in the soil during the rice maturity stage increased by 7.32%～24.39%,available phosphorus content increased by 0.84%～11.44%,and available potassium content increased by 0.41%～8.83%.Additionally,the soil electrical conductivity decreased by 16.67%～75.00%.
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