FOLIAR DIAGNOSIS IN CITRUS .1. EFFECT OF CULTIVARS AND OF LEAF COLLECTING QUADRANTS ON MACRONUTRIENT AMOUNTS

The effect of the position of the leaves on the tree collected for che mical analysis, in relation to the quadrants, in 'Pera Rio','Valencia' and 'Baianinha' orange trees and in 'Murcote' mandarin grafted over ' Rangpur' lime rootstock, was studied. The experiment was carried out i n the Vitoria Farm at Alfenas, MG, Brazil. The experimental design was in randomized blocks, with four replications. The treatments were: No rth, South, East, West, North and South, East and West, and all quadra nts (test plot). With relation to the quadrants, 'Pera Rio' and 'Valen cia' presented variations for the Ca amounts; 'Murcote' for the K amou nts, and 'Baianinha' did not vary. Comparing the cultivars, Baianinha and Murcote presented higher amounts of P and K and smaller amounts of Mg. 'Pera Rio' and 'Valencia' had higher amounts of Ca and smaller of N in relation to the others and equal amounts between themselves. 'Mu rcote presented the highest amount of N. S amounts were equal for all cultivars.