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山东省农科院土肥所多年研究表明,山东省蔬菜瓜果的主要污染源70%来自化肥,氮、磷、钾的有效利用率分别为30%、20%和35%这不仅造成了极大浪费,而且大量没被吸收的化肥以不同途径进入地下水、地表水和空气,使宝贵的地下水资源面临严重污染的威胁。直接结果是导致土壤板结、肥力下降、农产品品质下降,严重影响农业的可持续发展。农业专家认为,增施有机肥减少化肥的施用量,有效利用一切有机资源,加快发展绿色农业有利于参与国际竞争,并将农用土地得以持续利用。因此生产无公害蔬菜,科学施肥刻不容缓。1 增加施用有机肥有机肥中不但含有蔬菜生长所需的多种营养成分,还能改良土壤,
Shandong Academy of Agricultural Sciences for many years of soil and fertilizers studies have shown that 70% of Shandong Province, the main source of pollution of fruits and vegetables from fertilizers, nitrogen, phosphorus and potassium were 30%, 20% and 35% utilization rate not only caused great waste , And a large number of unabsorbed fertilizers enter underground water, surface water and air in different ways, threatening the precious pollution of precious groundwater resources. The direct result is soil compaction, fertility decline, decline in the quality of agricultural products, seriously affecting the sustainable development of agriculture. Agricultural experts believe that increasing the application of organic fertilizer to reduce the application of chemical fertilizers, effective use of all organic resources, accelerate the development of green agriculture is conducive to participating in international competition, and the sustainable use of agricultural land. Therefore, the production of pollution-free vegetables, science and fertilizer without delay. 1 increase the application of organic fertilizer Organic fertilizer not only contains a variety of nutrients required for the growth of vegetables, but also improve the soil,