丹尼斯凤梨“3414”施肥效应试验

Trial of fertilizer effect on Guzmania denise based on the "3414" design

为了解满足丹尼斯风梨生长发育所需氮磷钾的最佳用量，利用“3414”方案分别建立了氮、磷、钾施肥量与植株干重、株高、冠幅、叶片数的回归方程，结果表明，由一元二次函数导出最大干重、株高、冠幅、叶片数的氮、磷、钾施用量为N151．82～175．7mg／L、P20522．79～23．38mg／L、K20258．25～298．5mg/L；由三元二次函数导出最大干重、株高、冠幅、叶片数的氮、磷、钾施用量为N153．13～216．51mg／L、P20519．78～28．33mg／L、K20253．28～311．8mg／L；较为适合丹尼斯风梨生长发育的氮磷钾（N：P2O5K2O）的比例为l：0．29～0．32：2．00～2．44。

In order to understand the optimum amount of NPK required of Dennis pineapple growth and development, regression equation between amount of nitrogen, phosphorus, potassium fertilization and plant dry weight, plant height, crown width, leaf number were established respectively on the experiment of ＂3414＂ design. Results showed that the amounts which met maximum dry weight, plant helght,crown width and number of leaves that were derived by a single quadratie function on nitrogen, phosphorus, potassium fertilization were N 151.82～175.7 mg/L, P205 22.79～23.38 mg/L, KzO 258.25～298.5 mg/L; the amounts which met maximum dry weight, plant height, crown width and number of leaves that were derived by the ternary quadratic function on nitrogen, phosphorus, potassium fertilization were N 151.82～175.7 rag/L, P205 22.79～23.38 mg/L, K20 258.25～298.5 mg/L; the NPK （N, P205, KzO） ratio of more suitable for Dennis pineapple growth and development was 1：0.29～0.32：2.00～2.44.