论文部分内容阅读
三、灌四水施五肥高攻田玉米在苗势达优的同时,必须按玉米高严的要求,把水、肥技术优化组装落实。总的要求是灌四水,施五肥,使玉米的营养生长和生殖生长有个良好的外部条件供达优需求,保证根、茎、叶的硕壮和单穗行粒多、千粒重高。四水,是根据玉米生长发育各阶段需水规律进行的。播种时间以耕层8℃为玉米生物学下限温度,地温到此指标后种子吸水膨胀后才能开始发芽。种子膨胀所需水分为种子风干重的35%～37%,耕层土壤含水量达18%即可。为达到种子出
Third, irrigation water four fertilizer five high-field maize Tianda seedlings in superiority at the same time, must be strict requirements of corn, the water, fertilizer technology optimization assembly and implementation. The general requirement is to fill the four sources of water and apply five fertilizers to make the vegetative and reproductive growth of maize have good external conditions for reaching the needs of the gorges and ensure that the roots, stems and leaves are strong and the grain per plant is large and the grain weight is high. Four water, is based on the corn growth and development stages of the law of water requirements. Sowing time to top layer 8 ℃ corn biology minimum temperature, ground temperature to this index after the water-swelling seed began to germinate. The water needed for seed expansion is 35% -37% of the dry weight of the seeds, and the moisture content of the topsoil can reach 18%. To reach the seed out