a rapid method to estimate leaf area in seedlings of "cagaita" (eugenia dysenterica d. c.) Foliar diagnosis in cttrus. 1. Effect of cultivars and of leaf collecting quadrants on macronutrient amounts

Abstract

The effect of the position of the leaves on the tree collected for chemical analysis, in relation to the quadrants, in 'Pera Rio', 'Valência' and 'Baianinha' orange trees and in 'Murcote' mandarin tree, grafted over 'Rangpur' lime rootstock, was studied. The experiment was carried out in the Vitória Farm at Alfenas, MG, Brazil. The experimental design was in randomized blocks, with four replications. The treatments were: North, South, East, West, North and South, East and West, and all quadrants (test plot). With relation to the quadrants, 'Pera Rio' and 'Valência' presented variations for the Ca amounts; 'Murcote' for the K amounts, 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 'Valência' had higher amounts of Ca and smaller of N in relation to the others and equal amounts between themselves. 'Murcote' presented the highest amount of N. S amounts were equal for all cultivars.