Efeito da omissão de nutrientes no crescimento e estado nutricional de mudas de açaizeiro (Euterpe oleracea Mart.) var. Vêr-o-peso em latossolo amarelo argiloso e arenoso.

Abstract

In order to evaluate the growth, dry mass production and the contents and accumulation of macro-and micronutrients in seedlings of assai palm (variety Ver-o-Peso) in sandy and clayey yellow latosol we conducted a greenhouse experiment based on the missing element technique. The experimental design was completely randomized with 14 treatments in clayey and 15 treatments in sandy yellow latosol, both in five replicates. The treatments were: complete fertilizer with liming (complete); complete fertilizer and no liming (complete-lime) (only sandy latosol); no fertilizer and no liming (control); complete fertilization with lime but with the individual omission of nitrogen, phosphorus, potassium, calcium, calcium without lime, magnesium, magnesium without lime, sulfur, boron, copper, manganese. An analysis of variance was performed on the data for the following variables: plant height, stipe diameter, leaf dry mass, stipe dry mass, and content and accumulation of nutrients in the leaves. In sandy yellow latosol initial growth in height of the assai palm was limited by the individual omission of P, N e K, Calime , Mg e Mg-lime and Cu. The production of leaf dry mass was affected by the following individual omissions in decreasing order: P > Cu > N > K > Mg. Leaf area was restricted by the following individual omissions in order: Ca-lime > N > P > K > Mg > Zn. Plant development as measured by relative growth of the aerial part is affected by the lack of Ca-cal > P > N > Mg-lime > Cu > K > Mg with an average reduction of 31%. The nutrients most needed by assai palm seedling as evidenced by the content and accumulation of the nutrients in the leaf dry mass follow the order: N > K > S > Ca > Mg > P > Mn > Zn > B > Cu. In clayey yellow latosol the initial growth in height of the assai palm was limited by the individual omission of N, P and Mg. The production of leaf dry mass was affected by the following individual omissions in decreasing order: N > K > Mg. Leaf area was restricted by the following individual omissions in order: N > P > K. Plant development as measured by relative growth of the aerial part is affected by the lack of P > K > N > Mg with an average reduction of 61,9%. The nutrients most needed by assai palm as evidenced by the content and accumulation of the nutrients in the leaf dry mass follow the order: N > K > Ca > Mg > P > Mn > Zn > B > Cu > S.