在水稻花粉母细胞减数分裂之前即幼穗分化处于四期末至五期初施肥,能保证减数分裂期充足的营养供应,以防止枝梗及颖花退化,增加结实率,故称为保花肥。从各地试验来看,水稻施保花肥一般增产10％以上,特别是对前期生长较差的禾苗,增产效果更显著,可高达20％以上。由于保花肥的增产效果显著,现在已成为水稻高产施肥的主要内容。怎样才能施好水稻保花肥呢? 首先要掌握施肥原则。对于生长健壮的禾苗,应以磷钾为主,适量施用氮肥;对于生长较差的禾苗,应以氮肥为主,配施磷钾肥料;对于生长较旺的禾苗,可适当少施或 Spikelet of rice pollen mother before meiosis that spike differentiation at the late fourth to early fertilization, to ensure adequate supply of nutrients during meiosis to prevent the degeneration of branches and spikes, and increase seed setting rate, so called fertilizer . From all over the trial, rice fertilization generally increase yield of more than 10%, especially for the poor growth of pre-seedlings, yield more significant effect, up to 20% or more. Due to the obvious effect of increasing yield of baohua fertilizer, now it has become the main content of high yield fertilization in rice. How can we apply rice fertilizer? First, we must master the principle of fertilization. For the growth of robust seedlings, should be based on phosphorus and potassium, the appropriate amount of nitrogen fertilizer; poor growth of seedlings should be nitrogen-based, with phosphorus and potassium fertilizers; for growing more vigorous seedlings may be less appropriate or