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对暗棕色森林立上栽培的6年生“美登”矮丛越桔，连续2年土壤施人N、NP和NPK复合肥，研究结果表明：土壤施入纯N肥，促进了树体生长，但百果重和产量降低，果实成熟延迟，且有贪青和越冬抽条加重现象;;土壤施入NP和NPK复合肥，既可以促进树体生长，又增加了百果重和产量，尤以NPK复合肥效果明显。经叶分析表明，施入N、NP和NPK肥均提高了叶片中N、K、Mn含量而降低了Ca、Mg含量;;增施N肥降低了叶片P含量，增施NP肥增加了叶片P含量。根据2年的研究结果认为，在暗棕色森林土壤上栽培越桔时单施N肥对生长不利，增施肥料以NP肥和NPK复合肥为宜，较适宜的施肥量为500～1000kg／hm2。
The 6-year-old “Medellin” bush broomcorn planted on the dark brown forest was applied with N, NP and NPK compound fertilizers for 2 consecutive years. The results showed that soil application of pure N fertilizer promoted the growth of tree, However, the fruit weight and yield decreased, fruit maturity delayed, and there is greedy and overwintering strips aggravating phenomenon ;; soil application of NP and NPK compound fertilizer, can promote the growth of trees, but also increase the weight and output of fruit, especially NPK compound fertilizer effect is obvious. The results of leaf tracing showed that N, NP and NPK fertilizers increased N, K and Mn contents in leaves and decreased contents of Ca and Mg. Increased N fertilizer decreased P content in leaves, P content. According to the results of two years, it is considered that single application of N fertilizer on the dark brown forest soil is unfavorable to the growth, NP fertilizer and NPK compound fertilizer are more suitable for fertilization, and the suitable fertilizer amount is 500-1000 kg / hm2 .