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(1)增施有机肥:施用有机肥,特别是施用腐熟的、用酵素菌沤制的有机肥,可大大降低蔬菜中的硝酸盐含量。(2)施用长效化肥:近年来研制成功的涂层尿素、长效碳铵、控制缓释肥料等化肥,有在土壤中不易淋失,肥效长远的特点。施用这些化肥可避免浪费,提高利用率,减少施用量,从而降低对
(1) Application of organic fertilizer: The application of organic fertilizer, especially the application of decomposed organic fertilizer made of enzyme bacteria, can greatly reduce the nitrate content in vegetables. (2) Application of long-term fertilizers: In recent years, successfully developed coated urea, long-acting ammonium bicarbonate, controlled release fertilizers and other fertilizers, in the soil is not easy to leaching, fertilizer long-term characteristics. The use of these fertilizers avoids wastage, improves utilization and reduces application rates, thereby reducing the number of pairs