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1978年本地区遇到多年罕见的大旱,本站从4月1日—6月20日80天内仅降雨23毫米,土壤含水率0—5厘米仅有2.48—4.4%,5—15厘米7.48～7.85%,15—30厘米17.22—19.35%,严重影响春玉米和棉花的出苗、全苗。4月下旬起沿海棉区就先后投入灌水夺取玉米、棉花全苗的抗旱斗争。本地区处于江淮之间每年在春、伏、秋季节都会出现短期的干旱,但还没有在盐土上灌溉抗旱的成熟经验,也缺乏对灌溉技术的研究,这是多年来急待解决的一项问题。我们针对苏北盐土的特点,结合棉花苗期大面积抗旱实际,进行了典型田块的定点试验与有关社队的调查研究,初步看出如下结果。
In 1978, the region encountered rare drought for many years. From April 1 to June 20, the station only rains 23 mm in the past 80 days. The soil moisture content is only 0.48-4.4% in 0-5 cm and 5-15 cm in diameter. 7.48 ~ 7.85%, 15-30 cm 17.22-19.35%, a serious impact on spring corn and cotton emergence, the whole plant. Since late April, coastal cotton areas have successively poured in water to seize the fight against drought in corn and cotton seedlings. There are short-term droughts in the spring, autumn and fall every year in the region between Jianghuai, but there is no mature experience in irrigating drought-resistance to salty soil and there is also a lack of research on irrigation technology, which has been urgently needed for many years problem. Based on the characteristics of salt soil in northern Jiangsu Province and combining with the actual drought resistance in large area at cotton seedling stage, we carried out the fixed-point test of typical plots and the investigation and study of relevant communities. The preliminary results are as follows.