仙优63作中杂或晚杂栽培时,因生育期长,需肥量大,在底肥不足、追肥少的田块,往往在幼穗分化期出现缺肥症状,此时如能巧追穗肥和壮籽肥,比不施可增产5％～15％。 穗肥又分促花肥和保花肥。在倒数第三叶抽出前3天,凡见禾苗生长不旺、茎叶稍落黄、茎瘦叶窄的可判断为缺肥症状,应追促花肥。促花肥在幼穗分化刚开始时(即在倒数 Xiangyou 63 for miscellaneous or late hybrid cultivation, due to the long growth period, the need for large amount of fertilizer, lack of base fertilizer, topdressing little plots, often appear in the panicle differentiation of shortages, such as clever scion Fertilizer and strong seed fertilizer, than not to yield 5% to 15%. Spike fat and fertilizer flower and fertilizer points. In the last three days before the last three days of extraction, see the growth of seedlings are not flourishing, stems and leaves slightly yellow, thin stems and thin leaves can be judged as lack of fat symptoms, should catch up with fertilizer. The flowering fertilizer at the beginning of panicle differentiation (ie in the countdown