【摘要】 [目的]探索硝酸盐含量不超标的前提下使菠菜高产的供氮水平及有机无机肥料配比。[方法]通过大田试验,研究了不同氮素水平下有机无机肥料配施对菠菜产量和硝酸盐含量的影响。[结果]菠菜产量随着氮素水平的提高而增加,而达到一定水平后继续追加氮素反而造成菠菜减产;与单施有机肥或单施尿素相比,有机无机肥料配施可以获得更高的菠菜产量。菠菜硝酸盐含量随着氮素水平的提高而增加;单施有机肥产生硝酸盐最少,有机无机肥料配施次之,单施尿素产生硝酸盐最多。[结论]综合考虑产量和硝酸盐含量2个因素,纯氮施入量300 kg/hm2,75%的N由有机肥提供、25%的N由尿素化肥提供为最佳氮素水平和配施组合。更多还原

【Abstract】 [Objective] The purpose was to explore the nitrogen levels and combined application of organic and inorganic fertilizer below the criterion of nitrate content with the super-high yield of spinach.[Method] A field experiment was carried out to study the influence of combined application of organic and inorganic fertilizer under different nitrogen levels on the yield and nitrate content of spinach.[Result] The yield of spinach was increased by increasing nitrogen levels and was decreased at higher nitrogen level after it achieved certain value.Compared with the treatment of only applying organic fertilizer or only applying urea,combined application of organic and inorganic fertilizer could improve the yield of spinach.The nitrate content of spinach was increased by increasing nitrogen levels.The treatment of only applying organic fertilizer produced the minimum nitrate content of spinach,the second was the combined application of organic and inorganic fertilizer and the only applying urea took the maximum.[Conclusion] Taking a comprehensive consideration between the yield and nitrate content of spinach,the best nitrogen level was 300 kg/hm2 provided by organic fertilizer and urea with the proportion of 75% and 25% respectively.更多还原