| The tomatoes which were sensitive to iron and zinc were utilized to investigate the different effects of Bordeaux nutrition protective powder(BNPP-Fe、BNPP-Zn、BNPP-Fe-Zn) and Kocide on iron and zinc deficiency and growth of tomatoes by sandy culture method.The research results indicated that because Bordeaux nutrition protective powders contained a number of soluble iron and zinc,chlorophyll content,active iron content,total iron content and total zinc content in leaves of tomatoes were increased differently by spraying BNPP-Fe、BNPP-Zn、BNPP-Fe-Zn,compared with CK,in order to rectify iron and zinc deficiency.Meanwhile,the plant height and the stem diameter of tomatoes were hastened by spraying the three different Bordeaux nutrition protective powders,and the yield of tomatoes with BNPP-Fe、BNPP-Zn、BNPP-Fe-Zn treatments increased by 63.8%,27.6%～33.7% and 129%～140%,respectively.In addition,Compared with Kocide,active iron content,total iron content and zinc content in leaves of tomatoes by spaying BNPP-Fe-Zn was significantly increased by 65.1%～173%,78.7%～104% and 109%～142%,respectively.Moreover,The yield of tomatoes with BNPP-Fe-Zn treatment was increased by 15.2% ～22.8%,but the yields of BNPP-Fe and BNPP-Zn were less than that of Kocide treatment.As a result,the effect of BNPP-Fe-Zn was the best among the three different Bordeaux nutrition protective powders. |