XÁC ĐỊNH KHOẢNG THỜI GIAN THỤ PHẤN THÍCH HỢP CHO HOA CÁI CỦA CÂY DÂU

Research on determining the appropriate pollination time for the mulberry trees. To determine the appropriate pollination time for the mulberry trees, we experimentalised as follows: the variety K10 was hybridised sexually with the variety DB86 at time like: the female flower newly opened; the female flower opened 2 days, 4 days, 6 days, 8 days, 10 days and 12 days. The results of experiment showed that after the female flower had opened 2 - 6 days, the percentage of effective pollination is highest about 55.60 - 67.80%. The average seeds of each mulberry fruit is about 37.56 - 48.21 seeds, it increased by 38 - 77%. The percentage of sprouted seeds is about 90.90 - 91.03%, increased by 4 - 6%. The number of mulberry trees that are still alive on stage of three real leaves rose 7 - 10% than pollinate at the flower newly opened.