Lâminas de irrigação com água residuária e adubação orgânica na cultura do algodão BRS Safira.

Abstract

Residual water contains high levels of organic matter and minerals, mainly nitrogen and phosphorus. The re-utilization of water in agriculture not only reduces but also, in some cases, eliminates the need to use chemical fertilizers or manure. With a view to evaluating the effects of irrigation with treated domestic waste as well as the presence/absence of organic manure in the soil attributes and in the components of development/produce of the cotton crop {Gossypium hirsutum L. r. latifolium Hutch., cultivar BRS Safira, CNPA 01- 55); with an emphasis on the involvement of the community in the participation and adoption of the new technology, a field experiment was set in the Hydrographic Basin of the Ipojuca River - PE - within the Pilot Unit for Treatment and Re-utilization of Domestic Waste for Productive Means - Mutuca (ETE-MUTUCA) of the Federal Rural University of Pernambuco - UFRPE, located in the district of Mutuca, situated in the municipality of Pesqueira - PE. In this experiment, the effects of the levels of irrigation in the growth of the vegetation, the yielding of the cotton crop and the physicochemical attributes of the soil were assessed. The experimental outlining was studied in blocks in a factorial scheme (4x2) x4, whose factors were placed in 4 levels (120, 100, 80,60%) of the crop need for water; the absence/presence of organic manure (0 e 80 kg ha"1 of N); with 4 repetitions. During the research, physicochemical analysis of the effluent used in the irrigation (5 collections); and physicochemical analysis of the irrigated soil were carried out in two the experiment. The results chloride, sodium, sulfates, different time periods - at the beginning and at the end of reached have allowed the identification of the variables o:: calcium, potassium, conductivity, total hardness, volatile solids, total diluted solids, fixed diluted solids and volatile diluted solids; fixed solids and total solids were the ones which most influenced the main component - CP1 - of the quality of the water. These variables were present in the water drainage indicating high lixiviation of the salts present in the soil. The growth of the cotton crop responded more to the need for water than to the presence/absence of manure made of bovine crap. The highest rates of crop produce were reached in the largest lamina foil of applied irrigation - 120% of the produce need for water. The contents rates of carbon and organic matter in the soil, at the end of the experiment, were high due to the use of waste water and cattle manure.