河北省夏玉米生长期具有自然降雨充沛,低温寡照,籽粒灌浆不足等特点。在生产上可通过以下关键技术环节提高产量。一、合理密植合理加大种植密度、提高亩收获穗数是实现玉米高产的重要途径。试验表明,亩产1000公斤产量水平时,亩穗数绝大多数为4800—6000穗,平均达到约5400穗。高产田种植密度比一般生产出密度要高20%—50%。河北省夏玉米亩产700公斤以上产量水 The growth of summer maize in Hebei Province has the characteristics of abundant natural rainfall, low temperature sunshine, insufficient grain filling and so on. In the production through the following key technical aspects to increase production. First, rational and close planting Rational increase planting density, increase the number of ears per acre harvest is an important way to achieve high yield of corn. Experiments show that when the output level of 1000 kg per mu is reached, the vast majority of mu-spikes are 4800-6000 spikes, with an average of about 5400 spikes. Planting density of high yield than the average density of 20% -50%. Summer maize yield more than 700 kg of water in Hebei Province