Cultivo de berinjela sob irrigação com água residuária, doses de nitrogênio e fósforo.

Abstract

The use without control of water by man for various purposes has promoted scarcity of this natural resource especially in arid and semi-arid regions and consequently limiting the social and economic development of regions. The planned reuse is widely used around the world, however, Brazil, even having regions with water scarcity, this practice is not yet widespread. The eggplant (Solanum melongena L.) is a vegetable that has great importance in vegetable crops market in Brazil and worldwide. The objective of this research was to evaluate the technical feasibility of the use of nitrogen and phosphorus along with irrigation using post- treated wastewater in sand filter with intermittent flow in growth, biomass production and flowering eggplants grown in greenhouse in Paraíba semiarid region. The experiment was conducted in a greenhouse, in the Science and Technology Center Agrifood (CCTA / UFCG), Campus de Pombal - PB, and the treatments resulted in the combination of two factors: four doses of nitrogen (N1 - 3.55; N2 - 6.2; N3 - 8.9; N4 - 11.55 g N / pot) and four doses of phosphorus fertilization (P1 - 15.28; P2 - 26.74; P3 - 38.2; P4 - 49 66 g P / pot) corresponding respectively to 40; 70; 100; 130% as fertilizer indication for eggplants when grown in pots irrigated with treated wastewater post-intermittent sand filter (AR). It was added to a treatment with 100% application of N and P and whose plants were irrigated with water supply (AA). The experimental design was a completely randomized design, with treatments arranged in a factorial 4 x 4 + 1, with four replications. We conclude It follows you can use wastewater to irrigate eggplants, at conditions of semiarid. Doses of 3.55 g of N and 15.28 g P per plant when using wastewater in irrigation eggplants are sufficient to meet the nutritional needs of the crop. The fresh weight of eggplants sheet decreased linearly with the increment of N application. The fresh mass production and shoot dry eggplant plants irrigated with wastewater with 40 % application of N and P did not differ from plants receiving 100 % of the N and P indication when irrigated with water supply and reuse. The flowering was not affected by nitrogen and phosphorus doses, or by different types of water used in irrigation. There was no significant interaction of the factors studied on the variables evaluated in any of the study periods.