Effects of nitrogen,phosphorus and potassium fertilizers adding microelements formula fertilization on growth of young Betula alnoides Buch.-Ham.ex D.Don plantations

ObjectiveThe effects of microelements added to nitrogen(N),phosphorus(P)and potassium(K)fertili-zers on Betula alnoides Buch.-Ham.ex D.Don young forest were researched in order to supply reference for B.alnoides high-yield plantation production.MethodNine treatments were set,0.5 kg N,P and K fertilizers containing 45% effec-tive componets for single B.alnoides and each fertilizer adding 10.0 g boron(B)and 10.0 g B+5.0 g cuprum(Cu).Aver-age height,average diameter at breast high(DBH)and average individual volume of treated B.alnoides were analyzed.ResultThe effects of N,P and K fertilizer without microelements on height of B.alnoides young forest was extremely significant(P<0.01,the same below).However,their effects on promoting growth of DBH and individual volume were not significant.N,P and K fertilizers with B or N,P and K fertilizers with B+Cu had significantly(P<0.05,the same be-low)or extremely significantly effects on height,DBH and individual volume of 2-year B.alnoides young forest.The indi-vidual volume growth ratio of B.alnoides which were treated by three kinds of fertilizer formula(N,P and K fertilizers,N,P and K fertilizers+B,N,P and K fertilizers+B+Cu)was 1.0:1.2:1.4,and the effects of N,P and K fertilizers+B+Cu fertilizer with high contents of P and K elements were better than others treatments.Correlation analysis indicated that there was extremely positive correlation among plant height,DBH and individual volume of B.alnoides forest treated by N,P and K fertilizers+Bor+Cu.ConclusionMacroelements B+Cu elements added to N,P and K fertilizers improve the growth of 2-year B.alnoides young forest,especially N,P and K fertilizer+B+Cu with high contents of P and K elements.