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玉米在生殖生长旺盛时期,光合产物急需转化,由叶片(代谢源)向籽粒(代谢库)输送,而磷、钾元素对这个生理过程具有明显的促进作用。由于玉米中后期根系吸肥能力减弱,磷钾元素的吸收量不能满足玉米生长后期的需要,若能及时通过叶片给予补充,便能及时地协调玉米的源库关系,使籽粒饱满,提高产量。根据我站1981、1982年多点试验,即在玉米抽雄始期前后(八月初),喷施0.15％KH_2PO_4溶液,每亩喷肥液150斤,(亩用KH_2PO_4量为三两)与对照(喷清水)相比较,千粒重提高15.5克,每亩增产玉米56.8斤,增产率为8.9％。(见下表)
In the period of vigorous growth of maize, the photosynthetic products are urgently needed to be transformed and transferred from the leaf (metabolic source) to the grain (metabolic base), while the phosphorus and potassium elements have a significant promotion on this physiological process. Due to weakened root absorption ability of maize in the middle and late stages, the uptake of P and K can not meet the needs of late maize growth. If supplemented by leaves in time, the relationship between source and sink of maize can be coordinated in time to make the grain full and increase the yield. According to my station 1981 and 1982, more experiments were carried out, that is, spraying 0.15% KH 2 PO 4 solution before and after the beginning of tasseling (early August), 150 kg of fertilizer solution per acre (KH_2PO_4 amount for mu) Water) compared to 1000 grain weight increased 15.5 grams, yield 56.8 kg of corn per mu, the yield was 8.9%. (See table below)