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随着含元素种类较少的化肥的大量施用,含元素种类丰富的农家肥使用减少,以及农民将部分秸秆进行焚烧或者拿去饲养家畜,未补充缺乏元素的土壤日益增多。福建省梅列区部分农民施肥习惯已从施农家肥转变为只施用复合肥。如今市面所卖复合肥很多并不含钙。因此缺钙已经成为影响福建省三明市梅列区部分作物生产的关键因素。2012年,三明市梅列区土壤的检测结果(未发表资料)显示三明市梅列区63.5%土壤钙含量缺乏、92.8%土壤钙含量中等。缺钙已经成了影响梅列区作物生长的重要因素之一。以下是笔者在下乡遇见的甘薯缺钙症状及所做的实验。
With the extensive use of chemical fertilizers containing less elemental species, the use of fertilizers, which are rich in elemental species, is reduced and some of the straw is incinerated by farmers or used to raise domestic animals. There is an increasing amount of soil that is deficient in element-deficient elements. Some farmers in Meili District, Fujian Province, fertilization practices have changed from Shi Manfei to only apply compound fertilizer. Now many of the market selling compound fertilizer does not contain calcium. Calcium deficiency has therefore become a key factor affecting some crop production in Meilie district, Sanming City, Fujian Province. In 2012, the soil test results (unpublished data) of Meilie District in Sanming City showed that there was a lack of calcium content in 63.5% of the Meilizan District of Sanming City and a moderate amount of calcium in 92.8% of the soil. Calcium deficiency has become one of the important factors that affect the crop growth in Mellon. The following is the author in the countryside to meet the sweet potato calcium deficiency symptoms and experiments done.