Research on Applying Fertilizer of Pinus yunnanensis Seed Tree Forests

Growth conditions and timber quality of Pinus yunnanensis are decided by seeds'genetic characters.Because forests are afforested on wastehills where Pinus yunnanensis is distributed, many seeds are needed.How to outcome earlier and more wasn't solved by many forestry workers.Through analysing, the authors drew the conclusion that Pinus yunnanensis seed tree forests applying fertilizer could significantly increase growth incremnet of cone.Contrasted with those without applying fertilizer, cone quantity of per Pinus yunnanensis seed tree forests applying CO(NH₂)₂ 400g could increase by 103%;cone quantity of per tree applying K₂SO₄ 500g could increase by 70%;cone quantity of per tree applying Na₂B₄O₇·H₂O 400g could increase by 62%;cone quantity per tree applying Ca(H₂PO₄)·H₂O 500 could increase by 83%.