The Response of Young Slash Pine Plantation to Fertilization on the Shale Red Soil

The fertilization trial of Pinus elliottii plantation was established on the red soilo developed from slope deposit of shale in Fenyi County,Jiangxi Province. During the first four years(1992～1995)investigation show that:1. The effectiveness of N、P、K or its combined application was tangible in this young plantation. The total growth of height (H) ,diameter breast-high(DBH)、volume-increment of whole woods (V) of treatment plots amounted to 3.72～4.03 m,7.20～7.93 cm,27.650～34.158 m3/hm2,which were 5.1%～13.8%,7.0%～17.8%,15.2%～42.4% over check(CK)plots respectively. 2.The effect of P2K1 combined application was the best,but had no significant difference compared with the effect of NP2、P1K1、NP2K1 and single N、P、K application. There was no obvious difference between various N、P、K level treatments. The effect of P partition into two times a half per time was better than once. The total growth of V was 1.092～9.942 m3/hm2 which was higher than the latter. The obvious response of these treatments for the current annual increment lasted to the third year for H,DBH ,and to the fourth year for V. The obvious effect of N、K for the growth was only in the fertilization year. 3.Final results show that according to the response of young slash pine plantation to fertilization,100 kg/hm2 of P2O5 partition into two times fertilization or as once basal fertilization is enough in the soil type of this test.