Sub-irrigação em capim elefante e mucuna preta com uso de águas cinza em Cabaceiras - PB.

Abstract

The semiarid region of Northeast faces major droughts of the century, implying the loss of about 40 % of the cattle herd of strong genetic potential which is demanded for decades for improvement. To contribute to the dilemma, we created a model of Unit Agricultural Production Subsidiary ( UPAC ) , in order to irrigate two cultures with gray water from a public laundry . The research was conducted in the district of Ribeira -PB , a non- calcic soil Bruno , from the adaptation developed by Galbialti (2009 ) . The system was installed by digging 8 tanks 3x2x1m , waterproofed with plastic canvas , filled with sand , gravel , gravel , tires and 30cm of soil. The treatment I, II and treatment without cover with cover ( mulching ) . Cultures have enabled the deployment of elephant grass purple and velvet bean , whose biometry was performed at 120 days . The chemical analysis of crude protein (CP) neutral detergent fiber ( NDF) and acid detergent fiber ( ADF) corrected for MS at 105 ° C were performed according to Silva (1990 ) . The increase in DM production cut at 120 days, agrees with the results observed by Costa and Oliveira (1983) and Queiroz Filho et al (2000). Digestible components tend to decrease with age, while increasing its fibers (Pinto et al.1994) The statement was confirmed in this work, when there was a reduction in the levels of ( PB ) in Mobile Content ( CC ) and an increase in NDF and ADF with the cut at 120 days . Queiroz Filho et al (2000) found an increase in the fibrous parts of the forage grass aging elephant with this grass . The decrease in the nutritional value of the forage grass purple elephant with increasing age of the cut at 120 days , determined by low levels of CP 5.84 , the high NDF and ADF 80.04 48.26 , whether the low ratio F / C 50.07 and 0.86 . in this work we found 150 cm long and 7.38 cm wide with sub irrigation with gray water , which influenced the development of the plant . Already velvet bean had a higher value for the diameter in the treatment without cover , as this occurred because it does not suffer from competition with other cultures , or exercise allelopathy on weeds . The use of gray water becomes a viable alternative to minimize the scarcity of water.