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稻田灌溉水在正常情况下,氯根含量一般不超过1克/升。在严重干旱年份,不得不使用咸水灌溉。咸水来源:一是由于河川流量小,海水潮汐倒灌;二是稻田回归水的多次利用。咸水灌溉是在干旱缺水的特定条件下形成的,它对保持一定的水稻面积、力争多产稻谷有积极的作用。七十年代以来,海河、潮白河、蓟运河流域受水源限制,水稻栽培面积大幅度减少。滦河、辽河流域1982年以来也受到干旱的威胁。今后在一段相当长的时期内,难免用咸水灌溉稻田。为此,我们将多年来在实际工作中的点滴体会提出,供参考。一、灌溉水层对保苗的影响 1.适当加深水层。浅水灌溉在强烈的蒸发下,浓缩,盐分浓度增高。特别是插秧后复
Irrigation water in paddy fields Under normal conditions, the chloride content is generally not more than 1 g / l. In severe drought years, salt water has to be used for irrigation. Salt water sources: First, due to the small river flow, tidal influx of seawater; the second is the rice to return to water multiple use. Saltwater irrigation is formed under specific conditions of drought and water shortage, and it plays a positive role in maintaining a certain area of paddy rice and striving to prolific rice. Since the seventies, Haihe River, Chaobai River and Jiyunhe River have been restricted by water resources, and the area under rice cultivation has been greatly reduced. Luanhe and Liaohe rivers have also been threatened by drought since 1982. In the future, it is inevitable to irrigate paddy fields with salt water for a long period of time. For this reason, we have put forward some experiences in actual work over the years for reference. First, the impact of irrigation water on seedlings 1. Appropriate deepening of the water layer. Shallow irrigation under intense evaporation, concentration, increased salt concentration. Especially after transplanting