Effects of a Combined Application of Nitrogenous and Phosphorus Fertilizers on the Growth of Pinus radiata

摘要

cqvip:In the arid valley of the upper reaches of the Minjiang river,combined application tests of nitrogenous and phosphorus fertilizers were conducted to the 1-year-old seedlings of Pinus radiate to investigate the appropriate amount of fertilization,so as to provide bases of fertilization management of young P.radiate in the arid val-ley.Different combined application amounts of nitrogenous and phosphorus were studied based on the randomized blocks design.The results showed that in comparing 3 treatment groups with the control,the first and second treatments significantly increased the ground diameter and height of P.radiate,while the third treatment merely significantly increased the ground diameter.Under the conditions of this study,the recommended fertilization amount was 30 g of urea and 150 g of calcium superphosphate per plant for the one-year-old P.radiate.