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以青菜(Brassica chinensis L.)为试材,通过田间试验研究等养分条件下,以猪粪为原料的商品有机肥与化肥配施对青菜产量、可食部重金属含量以及土壤-青菜体系重金属(Cu、Zn、Cd、Pb)收支平衡状况的影响。试验设置化肥(CK)、低量有机肥配施化肥(LOM,有机肥施用量2250 kg hm-2)、中量有机肥配施化肥(MOM,有机肥施用量4500 kg hm-2)、高量有机肥配施化肥(HOM,有机肥施用量6750 kg hm-2)4个处理。结果表明,不同比例畜禽商品有机肥配施化肥对青菜的产量没有显著的影响。过磷酸钙和有机肥是土壤-青菜体系重金属输入的主要来源,从收支平衡来看,所有处理的Cu、Zn、Cd和Pb的输入量均大于输出量,表现为盈余,盈余量随有机肥施用比例的增加而增加;4个处理青菜可食部的Cd、Pb含量均低于国家的食品限量指标。说明适量畜禽商品有机肥配施化肥可取得与单施化肥相当的产量,同时也不会造成青菜Cd和Pb的超标,可视为废弃物资源化利用的途径之一,但长期施用会给农产品带来一定的重金属安全风险。
Taking Brassica chinensis L. as test material, the effects of organic manure and chemical fertilizers on pig yield, edible part heavy metal content and soil-vegetable system heavy metal Cu, Zn, Cd, Pb) balance of payments. Fertilizer (CK), low-level organic fertilizer (LOM) and organic fertilizer (2250 kg hm-2) were used in this experiment. Medium amount of organic fertilizer was applied with fertilizers (MOM and organic fertilizer was 4500 kg hm-2) The amount of organic fertilizer with fertilizer (HOM, organic fertilizer application rate of 6750 kg hm-2) 4 treatment. The results showed that different proportions of commercial organic fertilizer with fertilizers on the yield of green vegetables had no significant effect. Calcium superphosphate and organic fertilizer are the main sources of heavy metal input in soil-vegetable system. From the point of view of balance of payments, the inputs of all Cu, Zn, Cd and Pb are larger than the output, showing the surplus, the surplus with the organic Fertilizer application rate increased; the content of Cd and Pb in the four edible parts of green vegetables were lower than the national food limited indicators. Proper amount of livestock and poultry products organic fertilizer fertilizer can be obtained with the same chemical fertilizer yield alone, but also does not cause excessive levels of vegetables Cd and Pb, waste resources can be regarded as one of the ways to use, but long-term use will give Agricultural products bring some heavy metal security risks.