论文部分内容阅读
郸城县玉米平均单产仅900斤/亩左右,不仅低于小麦单产近100斤,而且与豫北等地的单产1200多斤/亩、超高产达到2000斤/亩水平相比,差距很大。造成玉米单产长期低而不稳的原因:一是品种选择不对路,耐密植高产品种种植面积小;二是密度偏低,不能满足高产需要;三是自然灾害多,灌排条件差;四是管理粗放,施肥水平低;五是收获偏早,造成人为减产等。针对玉米生产中存在的
The average yield of corn in Dancheng County is only about 900 kg / mu, not only lower than the yield of nearly 100 kg of wheat, but also differs greatly from the yield of more than 1200 kg / . Causes of low and unstable maize yield long-term reasons: First, the choice of varieties wrong way, dense planting high-yielding varieties planted area is small; Second, the density is low, can not meet the needs of high yield; Third, natural disasters, irrigation and drainage conditions are poor; Fourth Extensive management, low level of fertilization; Fifth, harvest is too early, resulting in man-made cuts and so on. For corn production exists