The Current Annual Increment Response of Yong Chinese Fir Plantation to Fertilization on Granite Yellow red Earth

This paper reports the results of a five year research on current annual increment response to fertilization in young Cunninghamia lanceolata plantation on the yellow red earth developed from granite in Fenyi County of Jiangxi Province.The effectiveness of N, P, K and 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 5.67～6.59 m, 8.35～9.28 cm, 67.922～96.417 m3/hm2, which were 5.6%～20.2%, 7.4%～17.5%, 21.6%～56.2% over check(CK) plots respectively.And the current annual increment response was analyzed.The effect of 50 kg/hm2 P2O5 (Calcium magnesium phosphate) as half the amount as basal fertilization and the other half as top dressing at the third year time or once basal was the best, it’s current annual increment response was obvious in the first year of planting and lasted to the fifth year.The effect of the same application amount of N(Urea) as half the amount for top dressing for two times was better than that of once.The response of K (Potassium chloride) application appeared when it’s applied with lower amount for two times in two years.There was no obvious interaction response of the application of N, P, K.