Foliar Analysis as an Estimate on the Nutritional State of Conilon Coffee Plantations on Cambisoils

Abstract: The objective of this paper relies on the establishment of the sampling moment and the nutritional state of the species Conilon coffee ( Coffea canephora ) cultivated in Cambisoils. The effect of different rates of nitrogen fertilization was also studied in the leaves concentrations of N, at randomized complete block designs (N 0 = 0; N 1 = 50; N 2 = 100; N 3 = 150 and N 4 = 200 kg·ha -1 of N) in presence of P (40 kg·ha -1 of P 2 O 5 ) and K (160 kg·ha -1 of K 2 O), with four replicates. The samples were carried out in the months of March (flower blossoming stage), June (fruits growing stage), September (grain development) and December (maturation) in all treatments. Foliar analysis carried out in the month of June (fruits growing stage) for the purpose of establishing critical nutrient range values for N, settling down approaches of interpretation of the same one for the Conilon coffee plantations on Cambisoils. The biggest percentages in the yields are obtained with leaves containing N between 2.80% and 3.10%, a value below 2.80% N which they associated with indicative percentages of stable maximum yield that did not surpass the limits of the adequate nutrients supply.