玉米的穗期是从拔节到抽穗阶段,这是玉米一生中生长最快、吸收养分最多、丰产栽培最关键的时期。此期内,营养生长与生殖生长矛盾突出。因此,正确运用肥水,同时满足两者需要,对争取穗大粒多,夺取丰产极其重要。 农民对追肥的经验是“三看”:看天、看地、看苗;“三攻”:攻秆、攻穗、攻粒。这里的攻秆、攻穗实际上是玉米一生中最为重要的两次追肥。攻秆肥指拔节肥,攻穗肥即是抽雄前10～15天的一次追肥。但这只是一种笼统 The heading stage of corn is from the stage of jointing to the heading stage, which is the period in which corn has the fastest growth, the most nutrient uptake, and the most important productive cultivation. During this period, the contradiction between vegetative and reproductive growth was prominent. Therefore, the proper use of fertilizer and water, while meeting the needs of both, is crucial for gaining more grain and more grain and gaining high yields. Farmers on the experience of dressing is “three see”: to see the sky, look, see Miao; “Three Attacks”: attack stalks, attack spikes, attack grain. Here stalks, attack ear is actually the most important two maize top dressing. Attack stalk fat refers to jointing fat, attack spike is tassel 10 to 15 days before the top dressing. But this is just a general