施肥时期对杨梅大小年的影响

Overcoming the Alternate Bearing of the Arbutus by Changing the Timing of Fertilizer Application

将采后（７月）施肥提前到春、夏梢发生前施用，能显著地缩小杨梅大小年幅度（变异指数春、夏肥为１２．０４，采后肥为３３．９８）；夏梢停长前（７月上旬）喷布５００ｍｇ·１^(-１)多效唑，增产效果显著；施春、夏肥与采后肥相比，果实单果重、可溶性固形物含量显著提高，果实含酸量显著降低。

Arbutus plants are cultivated in the non-irrigation regions in China.For arbutus,the fertilization wasusually carried out in July after harvest.During this period,it is difficult for the arbutus tree to absorb thefertilizer from soil due to the high temperature and dry weather,which restrict the summer shoot growth andflower bud formation,More new shoots and bearing branches can produced,and alternate bearing can mini-mized when fertilizer applied at both the spring and the summer shooting.When 500 mg·l￣(-1) paclobutrazolspray was supplemented before the formation of the summer flushes,the yield was increased and the ampli-tude of the alternate bearing was further decreased.