盐碱地占我省北部总土地面积的比例很大,合理改良和利用盐碱地,是因地制宜发展农业生产的一个重要内容。过去由于盲目发展小麦生产,片面追求扩大复种指数,导致灌水量越大,地下水位越高,土壤次生盐渍化越严重的恶性循环。通过总结经验和调查研究,我们认为,发展棉花生产是合理改良和利用盐碱地的重要措施。一、棉花耐旱,用水量小,可以减少灌水次数和灌水量,避免抬高地下水位。据山东打渔张灌区多年经验,在正常年份,棉田 The proportion of saline-alkali land in the total land area in the northern part of our province is very large. Reasonable improvement and utilization of saline-alkali land is an important part of developing agricultural production according to local conditions. In the past, due to the blind development of wheat production, one-sided pursuit of expanding the multiple cropping index led to a vicious cycle of greater irrigation, higher groundwater table and more secondary soil salinization. Through summing up experience and investigation, we believe that developing cotton production is an important measure for the rational improvement and utilization of saline-alkali land. First, cotton drought tolerance, water consumption can reduce the frequency of irrigation and irrigation, to avoid raising groundwater level. According to many years of experience in Shandong fishing Zhang irrigation area, in normal years, cotton fields