Effects of zinc levels on endogenous hormone and nitrogen metabolism in leaves and yields of balsam pear

Effects of zinc levels on yield and endogenous hormone and nitrogen metabolism in leaves of balsam pear(Momordica charantia cv Dading)were studied by field tria1．The results show that application of ZnSO₄·7H₂0 with doses from 30 to 45kg／hm² in zinc deficient soil can significantly increase the yields of balsam pear．from 16．21％ to l7．16％．Zinc application can also increase the IAA ，GA₃，protein，nuclear contents and NRase activity，but decrease the tryptophane，nitric nitrogen(N0)，free ammonic acids contents(FAA)and RNase activity in leaves of plants．The results also show that there is a significantly positive correlation between protein contents and nuclear contents，NRase，but a significandy negative correlation with NO₃ ，FAA and RNase，and a significantly negative correlation between tryptophane contents and IAA ．GA₃．nuclear contents and RNase activity．