为探讨营养元素钾对板栗(Castanea mollissima Blume)产量的影响,试验在板栗展叶期及以后叶面喷施钾肥溶液,比较了不同的喷施次数对板栗营养生长与生殖生长的影响.结果表明,展叶期及以后不同喷施次数对板栗的叶面积、叶重、雌花数、坐果苞率、单果质量及单株产量等都产生了显著的积极影响,其中喷3次比没有喷施钾肥溶液的对照叶面积增加了27.3％、叶重增加了28.6％、雌花数增加了57.9％、坐果苞率提高了36.9％、空果苞率降低了70.9％、每苞坚果数提高了52.9％、坚果百粒重增加了30％、单株产量提高了130％,并且单株纯经济效益比对照增加了18元以上,枝条混合样的钾含量比对照提高了82％,树体的营养水平迅速提高,值得在山区板栗园示范推广.%To explore the effect of potassium nutrient on yield of chestnut (Castanea mollissima Blume),potassium fertilizer was foliage sprayed after the leaf expansion period of chestnut,and the effects of different spraying frequency on vegetative and reproductive growth of chestnut were compared.Results revealed significant positive impact of spraying frequency on leaf area,leaf weight,number of female flowers,fruit-setting rate,empty fruit shell rate,fruit quality and yield per plant.Compared with the control,the leaf area,leaf weight,number of female flowers,fruit-setting rate,number of nuts per involucres,nut weight of 100 grains and yield per plant of the treatment spayed twice were increased by 27.3％,28.6％,57.9％,36.9％,52.9％,30％,and 130％ respectively; while empty involucre rate was reduced by 70.9％.The pure economic benefit per plant was increased by more than 18 Yuan (RMB).Potassium content of mixed branches samples was increased by 82％ compared with the control.The nutrient level of plant was increased rapidly,worth been demonstrated and popularized in chestnut orchard in mountainous area.
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