氮磷钾配施对田周地种植桂牧1号杂交象草产量及效益的影响

通过不同的施肥处理方案研究在田周地种植桂牧1号杂交象草Pennisetum purpureum cv.Guimu 1的氮、磷、钾需要量及其最佳配比模式。结果表明，在田周地种植桂牧1号杂交象草，通过合理的氮、磷、钾配方施肥，能够达到良好的生产效果与效益。实测结果以N2P2K2（氮肥414 kg/hm2，磷肥138 kg/hm2，钾肥276 kg/hm2)试验组的产量最高（256.81±1.18）t/hm2]，与其他低水平试验组差异均达到极显著水平(P<0.01)；与无肥处理相比，增产率达到16.6%。通过对各处理进行效应模型的配置与分析，得出田周地种植桂牧1号杂交象草的预测最高产量为259 t/hm2，对应施肥量为氮肥414621 kg/hm2、磷肥140 kg/hm2、钾肥204 kg/hm2；预测最佳经济产量为256 t/hm2，对应施肥量为氮肥414 kg/hm2、磷肥140 kg/hm2、钾肥172 kg/hm2。

Effects of N,P,K and their combinations on yield and benefit of hybrid Pennisetum purpureum cv. Guimu No.1 grown in field bund

The demands and optimum proportion of N, P and K of hybrid Pennisetum purpureum cv. Guimu No.1 grown in field bund were studied with "3414" design. The results showed that its response to formula fertilizing was good. Among the treatments, the best one is N_2 P_2 K_2 (N 414 kg/hm~2, P_2O_5 138 kg/hm~2, K_2O 276 kg/hm~2) and its yield was the highest (256.81±1.18) t/hm~2], and the difference with the low level treatments was significant (P<0.01). The yield was increased by 16.6% compared with the check. Based on the analysis of the effect prediction model, the estimated highest yield was 259 t/hm~2 and the relevant fertilizing formula was 414 to N 621 kg/hm~2, P_2O_5 140 kg/hm~2 and K_2O 204 kg/hm~2. The best economic formula wasN 414 kg/hm~2, P_2O_5 140 kg/hm~2 and K_2O 172 kg/hm~2, and the relevant yield was 256 t/hm~2.