Research on the Fertilization of Chinese Fir Seed Orchard

According to the experimental results of fertilizing in five seed orchards in Zhejiang and Guangdong Province from 1983~1990, it shows that the best result is from the unfertile soil. The sort of fertilizer and its making up should match with the soils in local sites, that are, N, P or N,P, K complex or mixed fertilizer on unfertile soil which is short of N and P; P, K mixed fertilizer on the soil which is short of P or K, but the concentration of N is above middle level. The time of fertilizing should be matched with the developing rhythm and differentiation of flower bud, the best time for fertilizing is likely to be June and followed by August and April. It is suitable to fertilize the trees two times per year,and had better to use not only chemical fertilizer but also farmyard or green manure. The amount of fertilizer used should be matched with the age of trees, that is generally 40~170g N, 100~250g P2O5 or 50~100g K2O per tree per time. The amount of seeds can be increased by 30%~50% with the best making up fertilizer and also increase the seed output rate of cone, weight of 100 seeds and germination percentage.