Avaliação do efeito da aplicação do adubo orgânico e/ou inorgânico no rendimento de duas variedades de arroz (Oryza sativa) no regadio de Chókwè

Abstract

The present work aims to evaluate the effect of the application of organic and/or inorganic fertilizer on the yield of two rice varieties (oryza sativa L.) in the Chókwè irrigation system. For this purpose, a test was carried out at the Chókwè Agricultural Station in the period between December 2003 and May 2004. The experiment was carried out following the DBCC, split plots, which had three replications and four different fertilization levels, administrative were the following: Control (T1), 25 ton composed per ha (T2), 30 kgP2O5/ha+120KgN/ha ( T3) and 25 ton Comp/ha+30KgP2O5/ha+120KgN/ha (T4). Yield components were evaluated, namely: Number of tillers per plant, height, number of plants per m2 (survival rate), total number of grains per panicle, percentage (%) and full grains per, panicle length, weight of 1000 seeds and total weight of panicola grain. Of the treatments studied, the two fertilizations (compounds and the combined) showed significant differences, at a significance level of 5% in relation to the control, increasing the grain yield. The combined had a tendency to produce higher grain yield despite not having registered significant differences with compost and mineral. Compost fertilization has greater benefits in economic terms than combined fertilization, in turn, than mineral fertilization. On the other hand, for tillering, only mineral fertilization had significant differences in relation to the control, while for plant height all treatments had significant differences in relation to the control, being the one combined with greater height. It is recommended to farmers in the region with low purchasing power, a fertilization with compost, as it would contribute to the increase of the gross margin. To large farmers it is recommended that it would not be economically viable.