Abstract:

Experiment of fertilizer had been carried out by using simplex core design and models of relationship between composition of fertilizers and yield had been obtained. The result indicated among seven treatments, the fertilizer formula and which was consisted of urea (containing N 46%) 0.3, calcium superphosphate(containing P₂O₅ 20%)0.6 and chloride potassium(containing K₂O 60%) 0.1 had the highest yield. The mean yield of fruit reached to 5.9146 kg·tree^-1 at 8-year-old which was higher 78.35 % than that in contrast treatment. The genetic algorithms had been used to achieved an optimal composition, which in theory contained urea 0.3, calcium superphosphate 0.59999961 and chloride potassium 0.1000038, and which was closest to the best production from real experiments. After fertilization, there were obvious difference in several main physiological indexes between this treatment and the contrast treatment, suggesting that the influences of various fertilizer compositions on yields were related with physiological metabolism. This study provided a basis for fertilization management of Castanea henryi plantation.

Key words: Castanea henryi, Combination fertilizer with a formula, Simplex core design, Genetic algorithms, Physiological metabolism