叶面喷施不同浓度多效唑对水稻生长及其产量的影响

Growth and Grain Yield of Paddy Rice as Affected by Spraying Different Concentration of Paclobutrazol on Leaves at Various Stages

摘要: 为探讨多效唑在水稻生产中进行喷施的最佳浓度，本研究以2个杂交水稻品种为材料，在田间自然条件下，研究了秧苗期和拔节期叶面喷施不同浓度多效唑对水稻生长及其产量的影响。结果表明，秧苗期叶面喷施450 mg/L多效唑溶液可将水稻移栽时苗高降低30%，单蔸分蘖数增加19.4%以上，且该浓度下单蔸有效穗数、穗总粒数和结实率较大，产量较高。拔节期叶面喷施360~450 mg/L多效唑溶液可使水稻成熟期株高降低4.2%~9.6%，且该浓度下单蔸有效穗数和穗总粒数较大，产量最高。水稻生产上，秧苗期和拔节期叶面喷施多效唑的最佳浓度分别为450 mg/L和360~450 mg/L。

Abstract: In order to detect optimum leaves spraying paclobutrazol concentration in rice production. A field experiment was conducted to study the effects of spraying different concentration of paclobutrazol on leaves at seedling and jointing stages on growth and grain yield of hybrid rice, and 2 hybrid rice cultivars were used as materials. The results showed that, seedling height at transplanting was reduced by 30% and tiller number per hill was increased by more than 19.4% by spraying 450 mg/L paclobutrazol on leaves at seedling stage. The panicle number per hill, grain number per panicle, seed setting rate and grain yield at mature stage were higher when spraying 450 mg/L paclobutrazol on leaves at seedling stage. Plant height at mature stage was reduced by 4.2%~9.6% by spraying 360~450 mg/L paclobutrazol on leaves at jointing stage. In addition, panicle number per hill and grain number per panicle at mature stage were higher, and grain yield was highest when spraying 360~450 mg/L paclobutrazol on leaves at jointing stage. Based on these findings, 450 mg/L at seedling stage and 360~450 mg/L at jointing stage are probably optimum spraying paclobutrazol concentration on leaves in rice production.