论文部分内容阅读
肥料投入是农田物质能量投入的主要部分。近年来,由于人口的增加和耕地面积的缩小,单位面积耕地负荷不断加重。要解决日益尖锐的粮食供需矛盾,肥料投入的作用就显得更加突出。黄土高原地区中低产田占到总耕地面积的70％以上,其中大部分是低产田,且多以旱农经营为主。低产原因主要是地力瘠薄。增施肥料是充分发挥这些耕地土壤有限水分增产潜力的主要出路。本文就黄土高原地区农田肥料投入状况作一些初步讨论,供肥料建设参考。一、有机肥料投入现状有机质含量是土壤肥力的主要表征,它影响着土壤结构和土壤持水量等重要生产性
Fertilizer input is the main part of farmland material energy input. In recent years, due to the increase of population and the shrinking of cultivated land, the load of cultivated land per unit area has been continuously increased. In order to solve the increasingly sharp contradiction between the supply and demand of grain, the role of fertilizer investment becomes even more prominent. The middle and low yield farmland in the Loess Plateau accounts for more than 70% of the total cultivated land area, most of which are low-yield fields and mostly dominated by dry farming. The main reason for low yield is infertility. Increasing fertilizers is the main way to give full play to the potential of increasing the yield of these cultivated soils. In this paper, some preliminary discussions are made on the input of farmland fertilizers in the Loess Plateau for reference of fertilizer construction. First, the status of organic fertilizer into the organic matter content is the main character of soil fertility, which affects the soil structure and soil moisture and other important productive