Abstract:

DRIS diagnosis method was used to diagnose the nutrient status of Castanea henryi plantation, based on the analyzing five nutrient elements in leaves of Castanea henryi plantations at 8 years old. Castanea henryi plantations stand were divided into three types according to the difference in real stand yield. The results showed that DRIS method could distinguish the balance state of the various elements and to determine the sequences of fertilizing, by considering the yield of each type stand and their nutrient content in leaves. When the high yield type stand was regarded as optimal value, the diagnosing results were that N element in middle-yield type stand was high but K element was low relatively; contents of N and P element in low-yield type stand was low obviously, so they had to be compensated.

Key words: Castanea henryi plantation, Nutrient, DRIS diagnosis