作者：蔡宜峰、戴振洋、郭俊毅

　　 本研究目的在探討利用氮、磷、鉀等不同種類化學肥料，對葉蘿蔔 生育及產量 之影響，以期建立適宜且合理的化學肥料使用技術。試驗處理包括氮肥、磷肥及鉀肥等三種化學肥料試驗，其中氮肥試驗包括 0 、 60 、 120 及 180 kg/ha 等四級處理，磷及鉀肥試驗處理包括 0 、 60 及 120 kg/ha 等三級處理，分別連續進行兩期作試驗。由試驗結果顯示，第一期作葉蘿蔔產量在不同氮肥用量處理間的差異不顯著，第二期作葉蘿蔔產量在不同氮肥用量處理間有顯著差異，第一、二期作葉蘿蔔產量在不同磷、鉀肥料用量處理間的差異不顯著。葉蘿蔔採收期地上部植株氮含量隨著氮肥用量之增加而增加，且不同氮肥用量處理間有顯著差異。葉蘿蔔採收期地上部植株磷含量隨著磷肥用量之增加而增加，但不同磷肥處理間差異不顯著。葉蘿蔔採收期地上部植株鉀含量隨著鉀肥用量之增加而增加，且不同鉀肥用量處理間有顯著差異。由不同氮、磷、鉀肥料用量分別與葉蘿蔔產量指數之相關分析顯示，兩者之間有顯著的二次曲線迴歸相關，由此可推算氮、磷、鉀三種不同化學肥料的經濟合理用量，分別為 120 kg N/ha 、 60 kg P₂O₅ /ha 及 80 kg K₂O /ha 。

關鍵字： 葉蘿蔔、氮肥、磷肥、鉀肥。

　　 The aim of this research is to evaluate the effects of N, P, and K fertilizers on growth, nutrient contents, and yield of leafy radish . Two field experiments were conducted with different application rates of N, P, and K fertilizers. N fertilizer experiment has four treatments including 0, 60, 120, and 180 kg N/ha. There were both three treatments (0, 60, and 120 kg P₂O₅ or K₂O /ha) in P and K fertilizer experiments. The results indicated that the yields of leafy radish have no significant difference among treatments in N fertilizer experiment at first crop, but there were significantly different among treatments at second crop. The yields of leafy radish have no significant difference among treatments both in P and K fertilizer experiments. The increasing of the application rate of N fertilizers increased the N contents of the shoot of l eafy radish, and there were significantly different among treatments. The increasing of the application rate of P fertilizers increased the P contents of the shoot of l eafy radish, and there were not significantly different among treatments. The increasing of the application rate of K fertilizers increased the K contents of the shoot of l eafy radish, and there were significantly different among treatments. By multiple regression analysis, the relations between the yield index of l eafy radish and the application rates of N, P, and K fertilizer were statistically significant. Therefore, the application rates with 120 (N), 60 (P₂O₅), and 80 (K₂O) kg/ha were appropriated and suitable for l eafy radish .

Key words: leafy radish, N fertilizer, P fertilizer, K fertilizer.