有机无机复配肥氮肥利用率的^(15)N生物示踪研究

Study on nitrogen fertilizer utilization efficiency of organic and inorganic compound fertilizer with ^(15)N isotope

采用盆栽大白菜15N示踪法研究不同复配比例有机无机复配肥的氮肥利用率。结果表明,有机无机复配肥氮肥利用率比全化肥复配肥明显提高6.5%~11.9%;大白菜产量提高9.0~32.6 g/盆,增产6.0%~21.7%。试验筛选出较佳的有机∶无机复配比例为:27∶73和47∶53,N-P2O5-K2O总含量为15%~20%,大白菜化学氮肥利用率达到38.75%以上,肥料效应最大。

Greenhouse ^15N isotope dilution was adopted to study nitrogen fertihzer utilization efficiency of organic and inorganic compound fertilizer. The results showed that nitrogen utilization efficiency of organic and inorganic compound fertilizers for Chinese cabbage was higher 6.5 % - 11.9% than that of inorganic compound fertilization. Application of organic and inorganic compound fertilizers increased yield of Chinese cabbage by 6.0% - 20%. Optimum proportion of organic fertilizer： inorganic fertilizer were 73：27 and 53：47, whereas optimum total nutrients （N-P205-K20） was selected as 15% - 20%. Application of such organic and inorganic compound fertilizer obtained the highest nitrogen fertilizer utilization efficiency （38.75%）.