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桃多数品种结实率高,能满足生产上的要求,但有些品种或某些年份也会因落果过多而影响产量。 一、桃落果的原因 桃落果一般有三个时期,第一期在开花后1～2周内,主要是由于缺乏授粉授精的条件,花期或临开花前雌蕊受冻。第二期在花后3～4周,此期主要由于授精不完全,胚的发育受阻,幼果缺乏胚供应的激素而引起落果。另外,花期缺乏氮素供应也能引起落果。第三期大约在5月下旬至6月上旬,又称六月落果,核硬化前后果实接近核桃大
Most varieties of peach high seed setting rate, to meet the production requirements, but some species or some years will also affect the output due to too much. First, the reasons for peach fruit Peach fruit generally has three periods, the first period of 1 to 2 weeks after flowering, mainly due to the lack of conditions for pollination and insemination, flowering or pistil freezing before blooming. The second period of 3 to 4 weeks after flowering, this period is mainly due to incomplete insemination, embryo development is blocked, young fruit lack of embryo supply hormones caused by falling. In addition, the lack of nitrogen supply flowering can also cause fruit drop. The third period from late May to early June, also known as the fall of June, the fruit before and after the nuclear hardening close to the walnut