A técnica da irrigação no crescimento e na produtividade da cana-de-açúcar no Nordeste.

Abstract

The main objective of that research went study to feasability from the technique from the irrigation in the growth and in the agricultural productivity from the of of in the Region Northeast of Brazil. Especificamente: analyzed itself to answer of the variables of growth from the culture from the sugar cane, third sheet, to the application of peculiar irrigation water sheets and levels of adubacao with zinc; Described Itself to relation between the techniques of irrigation and the development from the culture from the of of irrigated in the region, emphasizing the increase of productivity. In the first part from the research an experiment was driven in the Farm Grass I I (latitude 6°54'59,88"S, length 35°09'17,86", and altitude of 121 m), located in the town of Grass/PB. To farm situatesitself about the basin hidrografica of the Coastal North from the Paraiba, subbacia of the Miriri. They were studied, the effect of the irrigation water sheets in we will have of fracao from the ETc (sequeiro, 25%, 50%, 75% and 100% from the ETc), about the development from the culture from the of of, cultivate SP 79-1011. The levels of adubacao with zinc adopted were: 0, 1, 2, 3 and 4 kg of Zn ha-1, having like spring the sulfate of zinc heptahidratado (ZnS04 7H20), with 22% of zinc, being the quantities of the product, respectively, of 0,00, 4,54, 9,00,13,63 and 18,18 kg ha-1, applied in soil, in the form liquid with bombs kind costal. The handlings with you laminate of water of irrigation they caused significant effect, about the plant height variables, area foliar, number of perfilho, fitomassa of the colmo and fitomassa gross. In a second moment was carried out a search in scientific articles, theories, dissertations, books, and newspapers specialized, available in libraries and public institutions and in the Internet, with the purpose of build a foundation theoretician of fear and of know to reality from the of of irrigated in the Northeast of Brazil. In the Northeast the use from the technique from the irrigation in the culture from the of of was essential for the increase from the productivity and consequently from the his economic feasability