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前言大豆重槎和迎槎引起减产的事实,早已为生产实践和科学研究所证明。关于大豆必须轮换种植的许多农谚,在东北各地流传也甚为普遍,如“大豆重槎断半拉,迎槎易火笼”,“油见油三年愁”,“宁重槎,勿迎槎”,等等。这些农谚反映了农民群众对大豆重槎和迎槎遭致减产有深刻的认识,也是农民在多年的生产实践中对大豆轮作倒槎的宝贵经验的总结,关于这个现象产生的原因实质,国内外一些科学工作者也曾进行过多方面的研究。有人认为减产的原因是养分缺乏,有人认为是病虫严重为害的结果。
Preface The fact that soybeans weigh heavily and greetings have led to cuts has long been proved by production practices and scientific research. Many agricultural proverbs that soybeans have to be planted on a rotating basis are also commonplace in various parts of the Northeast, such as “Soybean weighs half and pulls in half, welcomes easy-to-fire cages”, “Oil seeks oil for three years”, “ ”,and many more. These peasant proverbs reflect a profound understanding of peasants’ heavy losses of soybeans and their reduction of production due to greetings. They are also summaries of valuable experiences of peasants turning over soybeans in their production practices over many years. The reasons for this phenomenon are true at home and abroad Some scientists have conducted many studies. Some people think that the reason for the reduction in production is the lack of nutrients, which some believe are the result of serious pests and diseases.