The effect of formula fertilization on the endogenous hormone content of leaves of Lagerstroemia indica
In order to study the effects of nitrogen,phosphorus and potassium fertilization on endogenous hormone contents of Lagerstroemia indica leaves,and to provide a theoretical basis for exploring the mechanism of fertilization to promote the growth of L.indica.Taking 2-year-old seedlings of L.indica'Zijingling'as the research material,the"3414"fertilization experiment design with 3 factors and 4 levels of nitrogen,phosphorus and potassium was adopted to determine the endogenous hormone contents of leaves with different treatments.The results showed that nitrogen,phosphorus and potassium fertilization significantly increased the IAA,GA3 and ZR contents and(IAA+GA3+ZR)/ABA of L.indica leaves,which were 26.35％～146.51％,10.82％～104.74％,27.26％～247.80％and 72.03％～456.73％higher than that of the no-fertilizer treatment T1(N0P0K0).The T6(N2P2K2)treatment had the highest IAA and ZR content,and the T3(N1P2K2)treatment had the highest GA3 content and(IAA+GA3+ZR)/ABA.The fertilizer application significantly reduced the ABA contents of leaves,which were 18.36％～57.17％lower than that of the no-fertilizer T1 treatment,and the T3 treatments had the lowest ABA content.With the increase of nitrogen,phosphorus and potassium fertilizer application,the contents of IAA,GA3 and ZR of L.indica leaves showed a trend of increasing and then decreasing,and the contents of ABA showed a trend of decreasing and then increasing.Nitrogen fertilizer had the greatest effect on IAA,GA3,and ZR contents of L.indica leaves,and phosphorus fertilizer had the greatest effect on ABA contents and(IAA+GA3+ZR)/ABA of leaves.Nitrogen,phosphorus and potassium fertilization can regulate the growth of L.indica by influencing the content of endogenous hormones in leaves.
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