Effects of Different Topdressing Stages on Production Characteristics and Yield of Rice
Using the slow-release fertilizer as base fertilizer,the influence of different topdressing periods on rice growth characteristics and yield was studied to provide scientific fertilization measures and decision-making basis for rice production in Nansi Lake basin.The rice variety'Jirudao 1'was used as the test material and five different topdressing periods were set up to carry out the tests.The amount of nitrogen fertilizer in the whole growth stage was 264 kg/hm2,the topdressing of nitrogen fertilizer was 69 kg/hm2,and the phosphate fertilizer and potassium fertilizer were applied at one time.The stem tiller dynamics,leaf SPAD value,leaf area and dry matter,yield and yield structure data were determined at different growth stages.The results showed that with the topdressing period,rice yield tended to increase first and then decrease and the yield order was T4>T5>T3>T1>T2.Before heading,especially during the booting stage,the tillers of T1,T2 and T3 were higher than that of T4 and T5.After heading tillers decreased rapidly in T1,T2 and T3,but kept steadily in T4 and T5.Finally T4 had the highest number of tillers,followed by T5.At heading stage,T1,T2,and T3 had higher leaf area index than that of T4 and T5,but at mature stage the order of leaf area index was T5＞T4＞T3＞T2＞T1.At the booting stage T1 and T3 were higher,followed by T2 and T5,and T4 was the lowest.At the mature period T4 and T5 were significantly higher than that of T1 and T2,and not much different from T3.Between treatments,the SPAD values varied less in the jointing and filling and more in maturity.At maturity stage,the value of SPAD in T4 and T5 decreased slowly.Under the premise of slow-release fertilizer as base fertilizer with side deep application,the effect of applying ear fertilizer was better than that of applying tiller fertilizer.The effect was better to pursue tiller fertilizer later,but better to pursue ear fertilizer earlier.
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