【摘要】 板栗空棚严重影响燕山板票的产量.产生原因与土壤中缺硼有关.通过早春施硼肥可使空棚率由85.53%下降到2.43%,产量提高7.7倍.但花期喷硼效果不稳定;人工辅助授粉和增施氮、磷、钾肥料及浇水对降低空棚率均无明显效果.更多还原

【Abstract】 The yield of chestnut ( Castanea mollissima BL ) is seriously reduced by seedless chestnut in Yanshan area. The emergence of seedless chestnut is related with the lack of boron in the soil. The experiment shows that by applying borax in early spring, the rate of seedless chestnut can be reduced from 85.33% to 2.43% and the production can be increased more than seven times. Spraying borax on the flowers in the blooming stage does not have steady effect, and artificial pollination, N. P.K.application and irrigation have no obvious effect either.更多还原