Efeito residual da adubação orgânica no crescimento do girassol.

Abstract

Looking forward to fínd scientifíc information to support the recommendation for using compost of organic waste and water, for both water supply and wastewater irrigation in the oilseeds cultivation, which contribute to minimize environmental impacts and water wastage through water reuse. In view of the cultivation of sunflower will provide employment and profit generation, strengthen family farms and improve the quality of life and the environment. The aim of this study consists of evaluating and quantifying the isolated and associated effects of wastewater, supply water and the residual effect of doses of fertilizers from solid waste compost on growth and production of sunflower Embrapa 122/V-2000. The experiment was conducted under conditions of protected area of Agricultural Engineering of UFCG, Campina Grande, PB. The experimental design was completely randomized with three replications. The treatments were in a 2 x 6 + 2 factorial scheme, in which the factors are consisted of two qualities of irrigation water (supply water and treated wastewater), six doses of solid waste compost (0, 60, 100, 140, 180 and 220 kg ha "') and two additional treatments, absolute witnesses. Plant height, stem diameter and leaf area were significantly affected until 45 DAS by the type of water. The number of leaves was influenced by both the type of water and the dosages of compost. The dosages of organic compost had a significant effect on the number of petals, outer and inner diameter, while the types of water influenced only the inner diameter. For variables of fresh phytomass and root length, the water did not have significant effect. However, the dosages of organic compost had an influence on ali variables of fresh phytomass. The water influenced significantly the variables of leaf dry weight + stem dry weight, while the doses of organic compost influenced the total dry weight and leaf dry weight+ stem dry weight. There was significant interaction between water and dosages of compost for the total dry weight, leaf dry weight + stem dry weight and dry weight of the flowers.