土壤母质及砧木对柑桔缺素影响的研究

A STUDY ON THE EFFECTS OF PARENT MATERIALS AND ROOTSTOCKS ON DEFICIENCY SYMPTOMS IN CITRUS

Trials were carried out with Jinchen orange (Citrus sinensis(L.)Osbeck) trees on 3 rootstocks grown in six soils typical for Sichuancitrus gooves.Differential degrees of chlorosis on various rootstocks andsoils were noticed.On the red brown purple soil,Jinchen orange trees onPoncirus trifoliata rootstock exhibited severe net-like chlorosis on theirspring and autumn flush leaves,Hongju-tangerine-stocked trees showedlight mottle-spotted chlorosis on their leaves,while no chlorosis occurredon trees on C.junos rootstock.On cobble yellow soil and mine yellowsoil,after the spring flush leaves turned green,the Jinchen orangetrees showed chowed chlorosis on the tip of their leaves.The treesobserved in these trials appeared healthy on gray brown purple soil.The chlorosis on P.trifoliata-stocked trees on 3 alkaline purple soilswere brought about by Fe-deficiency,that on Hongju rootstock by Mn-andZn-deficiency,and the leaf tip chlorosis on yellow soils might haveresulted from Ca-deficiency.