论文部分内容阅读
在豫北沿黄轻砂壤土地带，进行了滴、畦灌溉方式结合的夏棉水肥试验。结果表明，根据夏棉不同生育阶段的需水状况和土壤水分状况，可分别采用畦、滴灌溉方式，较正常畦灌棉田节水２２．７８％～２８．２４％，其中滴灌每公顷每次灌水定额仅 ２４３． ０～２８０． ５ｍ~３；对于中等肥力基础的棉田，生长期内追施氮肥（折纯氮）总量在 ３００ ｋｇ／ｈｍ~２范围内时，随施肥量的增加，其植株与各器官的生长状况均有利于产量的提高，施肥量同产量之间至二次曲线关系。
In the north of light yellow sandy loam area in northern Henan, a combination of drip irrigation and 畦 irrigation methods were used to study the summer fertilizer experiment. The results showed that according to the water requirement and soil water condition at different growth stages of summer cotton, the water use efficiency and soil moisture could be decreased by 22.78% -28.24% compared with the normal irrigation. The drip irrigation per hectare Only a fixed amount of 243. 0 ~ 280. 5m ~ 3. For medium-fertility cotton fields, when the total amount of topdressing nitrogen fertilizer (pure nitrogen) in the growing period was within 300 kg / hm ~ 2, the growth status of the plants and various organs Conducive to the increase of yield, the amount of fertilizer and production to quadratic curve.