论文部分内容阅读
采用多点田间小区试验及大田对比试验研究了无公害蔬菜施肥技术,结果表明:蔬菜硝酸盐含量与施N量呈显著的正相关,与施K量呈显著的负相关;施用有机—无机复合肥,增施磷、钾肥及锌、硼、微量元素肥料能降低蔬菜硝酸盐的含量,提高品质和降低病害发生;氮肥应在收获前20天施用;硝酸盐芹菜含量最高2 018.4mg/kg、苦瓜含量最低228.5 mg/kg;Vc海椒含量最高(果)786.2 mg/kg,莴笋(茎)含量最低59.55 mg/kg。增施有机肥和微量元素肥料有降低蔬菜硝酸盐和提高蔬菜品质的作用。
The results showed that there was a significant positive correlation between nitrate content and N application rate and a significant negative correlation with K application rate. The application of organic-inorganic complex Fertilizer, phosphorus, potassium and zinc, boron, trace element fertilizers can reduce the nitrate content of vegetables, improve quality and reduce the occurrence of diseases; nitrogen fertilizer should be applied 20 days before harvest; nitrate celery content up to 2 018.4mg / kg, Bitter gourd was the lowest 228.5 mg / kg; Vc was the highest (786.2 mg / kg) and lettuce (stem) was the lowest 59.55 mg / kg. Adding organic manure and trace element fertilizers have the effect of reducing vegetable nitrate and improving vegetable quality.