MIRANDA, R. J. A.; http://lattes.cnpq.br/8713773735563883; MIRANDA, Ricardo José Araújo.
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.