施肥对浙江楠结实性状及种子园土壤理化性质的影响OA

[Objective]This study aimed to investigate the effects of different fertilization methods and fertil-ization ratios on the growth and fruiting indexes of the mother tree of P.chekiangensis and the physico-chemical properties of the soil in the seed orchard,for optimizing the fertilization management of the seed orchard,and realizing the high and stable yield of P.chekiangensis.The results provide a scientific basis and technical support.[Method]The first seed orchard of P.chekiangensis in China,located in Qingyuan Experimental Forestry Farm,Zhejiang Province,was used to investigate the effects of two fertilization methods(furrowing and spreading)and different ratios of nitrogen(0 g/plant for N1,400 g/plant for N2,and 800 g/plant for N3),phosphorus(0 g/plant for P1,300 g/plant for P2,and 600 g/plant for P3)and potassium(0 g/plant for K1,250 g/plant for K2,and 500 g/plant for K3)fertilizers on the fruiting traits and leaf nutrient elements of the mother trees of P.chekiangensis,as well as the soil physiochemistry of the seed orchard,so as to screen out the optimal fertilization methods and fertilization formulation.[Result]Compared with the previous year,seed yield of P.chekiangensis under the furrowing and spreading treatments increased by 120.05%and 415.03%,respectively.Under the spreading treatment,the contents of alkaline hydrolys-able nitrogen,available potassium and organic matter contents of the soil in the 0～20 cm layer and leaf total nitrogen content increased significantly by 34.54%,19.47%,41.89%,and 15.95%,respectively,com-pared with the control CK.Different formula fertilizations significantly increased the seed yield and quality of P.chekiangensis,with T5(N2P2K3)showing the largest increase compared with T1(no fertilization).Un-der T5,fruit yield and 100-grain weight increased by 601.57%and 19.93%,respectively.In addition,T5 markedly increased soil available phosphorus and available potassium contents in the 0～20 cm layer by 248.03%and 157.62%,respectively,and increased available phosphorus and organic matter contents in the 20～40 cm layer by 146.42%and 21.99%,respectively.Leaf total nitrogen and total phosphorus con-tents increased by 9.49%and 53.76%,respectively.[Conclusion]Based on comprehensive evaluation of seed yield,leaf nutrient elements and soil physicochemical properties,surface spreading was identified as the most effective fertilization method for promoting high and stable yield production of the mother tree of P.chekiangensis.The optimal fertilization regime was determined to be N2P2K3.