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盐碱地种稻通常的习惯是大水洗盐,深水层管理,勤换水,勤灌、勤排,因此使用较大的灌溉定额。对于新垦盐碱荒地,这样的灌溉可能是合理的。因为盐碱重,盐害是主要矛盾,灌溉的目的首先是保苗,有苗则有产量,在一般栽培管理条件下,便可以达到亩产五、六百斤的水平。经过多年种稻改良,土壤逐渐熟化,盐碱已经不大,大半已经成为轻度或极轻度盐渍化水稻土,矛盾发生转化。这时主要矛盾不再是盐碱,而是土壤肥力。随着农业学大寨群众运动的深入发展,科学种田要进展快,收效大,灌溉的目标已不只是保
Saline-alkali rice is usually the habit of large salt water, deep-water management, frequently changing water, ground irrigation, dregs row, so use a larger irrigation quota. For newly reclaimed saline-alkali wilderness, such irrigation may be justified. Because salinity, salinity is the main contradiction, the first purpose of irrigation is to maintain seedlings, seedlings have yield, in general cultivation and management conditions, we can achieve the level of five or six pounds per mu. After many years of paddy improvement, the soil gradually matured, salt is not large, most have become mild or very mild salinization of paddy soil, contradictions occur transformation. At this time the main contradiction is no longer saline, but soil fertility. With the deepening development of the mass movement of agriculture in Dazhai, the goal of scientific farming has to progress rapidly and yield great benefits. The goal of irrigation has not only been to protect