云贵高原红壤人工草地定植期经济合理施肥量的确定

The determination of economical fertilization of establishment stage in Yunnan-Guizhou plateau red soil pasture

探讨了红壤人工草地定植期的主要肥力限制因子 ,通过对施肥效应的动态监测 ,构建了人工草地定植期的施肥模型 ,并确定出经济合理的施肥量。结果表明 :在施肥效应中 ,白三叶 - P素效应最显著 ,白三叶与施磷量间呈显著正相关 (r=0 .6 6 ) ;同时白三叶 - K素效应也较显著 ,白三叶与施钾间的相关性 r=0 .5 0。定植期在混播人工草地中 ,经济合理的最佳施肥量为纯磷 95 .4 kg/ hm2 ,纯钾 13.9kg/ hm2 ;在单播人工草地中 ,黑麦草经济合理的最佳施肥量为纯磷 83.4 kg/ hm2 ,纯钾 13.8kg/ hm2 。

The critical fertilizer factor was studied in the establishment stage of the red soil fertilizer. Under pasture yield, monitoring the fertilizer model and the economical fertilization were determined. The results showed that the phosphorus was the critical fertilizer factor for establishing pasture in red soil region and the marked increasing production was made by the phosphate fertilizer. Among the fertilization effect, the white clover phosphorus was the best ( r =0.66), followed by white clover potassium( r =0.50) and white clover calcium. During three years, compared with P0K0, the increased pasture yield was obtained by P180K0. In establishment stage ,for mixed sown pasture, the economical fertilization was pure phosphorous 95.4 kg/hm 2 and pure potassium 13.9 kg/hm 2 ; for single sown pasture, ryegrass economical fertilization was pure phosphorus 3.4 kg/hm 2 and pure potassium 13.8 kg/hm 2 .