Keywords: biomass, nutrient distribution, DRIS, leaves, branches, roots, fruit.
The present study was carried out in two ‘Persa’ lemon orchards, each one with a different soil type, with the objective of understanding dry matter and nutrient distribution in citrus organs and determining their nutrimental value. Orchard 1, 12-years-old, was growing in a clay-sandy soil; and Orchard 2, 9-years-old, in a clay soil. The method of study consisted of extracting four whole trees per orchard to divide each one of them into its different organs: leaves, flowers, fruits, branches, trunk, and roots. The variables measured included fresh and dry weight of each organ. We determined nutrient concentration using chemical analysis: N, P, K, Ca, Mg, B, Cu, Fe, Mn, and Zn. Data from both orchards underwent analysis of variance and mean comparison tests separately. Fibrous roots (< 1 mm diameter) for both orchards presented high micronutrient concentrations, particularly Fe and Mn. For both orchards, nutrients extracted in higher quantity by the fruit were K and Ca; and Zn and Cu in less quantity. Regarding biomass distribution, trunk and stems provided 60.32 %, roots represented 26.93 %, and leaves 9.41 % of tree total dry matter; while leaf N represented 17.5 % of the total plant in Orchard 1. This represented 1.85 times more nitrogen in relation to leaf dry weight. Similar data were obtained from Orchard 2. Cu and N were the most required nutrients in both orchards.