花期喷硼对板栗光合特性和结实率的影响

Effects of spraying boron fertilizer at flowering stage on photosynthetic characteristics and fruit-setting rate in Castanea mollissima

为了降低板栗空苞率，以‘燕红’板栗为试材，于花期喷施0.1%、0.2%、0.3%、0.4%、0.5%5种不同质量分数的硼砂溶液，探讨硼对板栗叶片光合特性和结实率的影响。结果表明：在5个质量分数梯度的硼肥处理中，板栗叶片中叶绿素含量、光合速率、气孔导度、胞间CO2浓度和结实率等指标均随硼质量分数的增加呈先升高后降低的趋势；当喷施硼质量分数为0.3%时，各指标显著高于其它处理和对照。因此，花期喷施一定质量分数的（0.1%～0.3%）硼肥可显著提高‘燕红’板栗叶片的光合作用和结实率，以质量分数0.3%时为最优。

In order to decrease empty shell rate in Castanea mollissima, taking the cultivar‘Yanhong’ as experimental materials, the effects of boron element on photosynthetic characteristics and fruit-setting rate in C. mollissima by spraying ifve mass fractions （0.1%, 0.2%, 0.3%, 0.4%, 0.5%） of boron fertilizer at lfowering stage. The results show that chlorophyll content, photosynthetic rate, stomatal conductance, intercellular CO2 concentration and fruit-setting rate are increased ifrstly and then decreased, with increasing mass fraction of boron fertilizer. The indexes in spraying 0.3%boron fertilizer treatment are signiifcantly higher than that of the other treatments and CK. Therefore, it can signiifcantly improve leaf photosynthesis and fruit-setting rate to spray a certain mass fraction （0.1%-0.3%） of boron fertilizer at lfowering stage, and spraying 0.3%boron fertilizer is the optimal treatment.