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玉米整个生育过程分为苗期、穗期、花粒期三个阶段。不同阶段对氮、磷、钾的吸收量是不同的,氮最多,钾次之,磷较少。对于夏玉米来说,吸收氮的时间较早,吸收较快。苗期氮的吸收量占总量的10%,拔节孕穗期吸收量为76%,抽穗至成熟期吸收量为14%;磷吸收也较早,苗期吸收10%,拔节孕穗期吸收62%,抽穗受精及籽粒形成期吸收28%;对于钾元素,抽穗前有70%以上被吸收,抽穗受精时吸收30%。由此可看出,玉米对氮、磷、钾三要素的吸收量都表现
The whole process of corn is divided into seedling stage, spike stage, pollen stage. Different stages of nitrogen, phosphorus and potassium absorption is different, nitrogen is the most, followed by potassium, phosphorus less. For summer maize, the absorption of nitrogen earlier, faster absorption. The nitrogen uptake at the seedling stage accounted for 10% of the total, the uptake at jointing and booting stages was 76% and the uptake by heading to maturity was 14%. The phosphorus uptake was also earlier, 10% at seedling stage, 62% , 28% of heading and fertilization, and 28% of seed formation. For potassium, more than 70% was absorbed before heading and 30% during heading. It can be seen that the absorption of nitrogen, phosphorus, potassium three elements of corn performance