海南花岗岩砖红壤上柱花草的磷钾肥料效应

在海南花岗岩砖红壤上对柱花草进行了施用磷钾肥料配经试验。结果表明：（１）施用磷肥促进柱花草根系生长，根量增加。（２）施用磷肥促进地上部株高的增长和干草产量的提高。随磷肥用量增加产量比对照提高９．９％￣２３．８％，钾肥施用，随钾肥用量的增加产量提高９．６％￣１７．９％。（３）磷胛肥能显改善柱花草的品质，施磷可提高其蛋白用量的增加草粉灰分含量。（４）根据磷肥钾与柱花草产量建立的回归模型计算，花岗岩砖

Efficiency of Phosphate and Potassium Fertilizers for Stylosanthes guinensis on Granitic Laterite

StyloSanthes guianensis is one 0f the high quality tropical forage legumes. From1994 to 1996. the test of phosphate and potassium fertilizer formula on Stylosanthes guianensis had been educted on granite laterite' The results indicated that P fertilizer could improve the root grOed and rcot production Of Stylosanthes guianensis as well as the height growth and dry mat-ter vield. P fertilizer application enhanced the drymatter yield by 9. 9 % - 23. 8 % and K fertiliz-er aPplicatiOn (K20<180kg/hm2) by 9. 6 % - 17 - 9 % as compared with CK. The quality of the dry matter'was improved significantly by P and K fertilizers. The crude protein and total P of the dry matter increased with P fertilizer.applicati0n. The K fertilizer could raise the crude ash con-ten wiificantly and reduce the dry rnatter crhde protein slightly. According to the regression modl bulltwith PK fertilizers and the dry matter yield, the most economic fertiliser applicationon the granitic laterite was P205 1l3. 9kg/hm2 and K2O l25. 9kg/hm2.