Effect of Different Fertilization on Soil Biological Properties and Yield in Castanea mollissima Stand

Experiments were conducted on different fertilization in Castanea mollissima stands in Tonglu, Zhejiang province, with four treatments, including no fertilization, reducing fertilization, conventional fertilization and increment fertilization. The result showed that the biomass of soil microorganisms in the chestnut forest increased with fertilization within certain quantity. The number of bacteria, fungi and actinomycetes were expressed as conventional fertilization increment fertilization reducing fertilization no fertilization. The soil enzyme activity was significantly increased by fertilization, and the activities of sucrase, urease, phosphatase were expressed as increment fertilization conventional fertilization reducing fertilization no fertilization. Different treated stands had no significant effect on single fruit weight. The average single fruit weight ranges from 8.50-8.85g. With the increase of fertilizer quantity, yield of chestnut significantly increased, however, excessive fertilization had negative effect on the yield. The yield of different treated stands ranged from 693.0-1273.5kg/ha.