NUTRIENTS IN BIOMASS, YIELD AND QUALITY OF PINEAPLE SECOND HARVEST-THE EFFECT OF SOIL MANAGEMENT TECHNIQUES AND PLANTING TECHNIQUES

Abstract

This essay was established at the Fundação Estadual de Pesquisa Agropecuária Experimental station in Maquine in the northeastem Rio Grande do Sul state coastland, Brasil. From august 1997 to october 1999 were evaluated in a pineaple experiment the effect of soil management techniques (conventional, strip- tillage and no-tillage, planting tecniques (furrow and spear), on biomass yield and its nutrient contents. Fruit quality and productivity were also evaluated in this pineaple cv. pérola second harvest. Results showed that soil management techniques did not affect biomass production and nutrient concentration on pineaple leaves. In the conventional tillage, biomass productivity (green and dry) and that of fruits was 45.6; 7.4; 14.4 t/ha and its contents of N; P; K; Ca and Mg amounted 99; 10; 238; 10 and 10 kg/ha respectively. Mantained the due proportions of biomass yield and its nutrients in the higher technological levei (MODEL, 1999) the fertilization needs would be 587 kg of N and 946 kg of K O. Productivity and percentage of harvest in conventiohal ti Ilage (14.35 t/ha and 51.2 %) were higher than in no :tillage (8.61 t/ha and 31.2%) respectively. Length of fruit and crown diameter in the conventional-tillage were higher than in no-tillage, but fruit lenght and total degree of soluble solids showed to be not affected by treatments.