Effects of phosphorus and inoculation of VAM fungus on nutrition of two citrus rootstocks

Abstract

This study was carried out to evaluate the effects of phosphorus and inoculation with the VAM fungus, Glomus clarum, on nutrition of orange rootstocks, planted in plastic containers until the grafting period. A factorial design (4 x 2 x 2) with four phosphorus doses (0, 320, 640 and 1280 g of P₂O₅/m³), two orange rootstocks [Rangpur lime (Citrus limonia L. Osbeck) and Cleopatra mandarin (Citrus reshni Hort. ex Tan.)] with and without inoculation of Glomus clarum were used. Increased dosages of phosphate resulted in higher amounts of P and Ca, lower amounts of Cu and Zn, higher amounts of B in dry matter of Rangpur lime and lower amounts of B in dry matter of Cleopatra mandarin. The inoculation of VAM decreased the amounts of Kin dry matter in both plants. Rangpur lime when inoculated had lower amounts of S. Cleopatra mandarins when inoculated had higher amounts of S. The amount of micronutrients in dry matter wasn't influenced by the inoculation.