Probabilidade de atendimento da demanda hídrica para a cultura da cana-deaçúcar (Saccharum spp) em Rio Largo-AL.

Abstract

Brazil is currently the world's largest producer of sugar cane, and the state of Alagoas one of the main producers, and economically dependent on your system agroindustrial. The future expectations of the culture in Brazil are favorable to the expansion through increased productivity through new technologies, aiming to maximize the production and minimize costs. As a semi-perennial plant, culture suffers the influence of climate variations throughout the year, and the availability of water the main factor causing the variability in productivity, year by year. The objective of the study was to identify the demand water for the crop at different stages of their development (through empirical equations), identifying the phases where culture will be more strongly affected by the lack of water (water deficit), making the water balance, and calculate the probability of attendance water demand. The meteorological data were obtained from the Meteorological Station of the Experimental Area Campus Delza Gitaí, Rio Largo AL. Taking into consideration the conditions analyzed, the results of the study allowed to obtain the following conclusions: (a) it is possible to establish the water deficits in the various stages of development of culture, these can be used in decision-making related to periods of planting, optimization of irrigation, among others. (B) It was possible through the empirical equations, establishes values of the variables necessary as Evapotranspiration Potential (ETP), coefficient of Culture (KC), Evapotranspiration Maximum (ETM), and could apply to data the distribution of probability range, with results satisfactory. (C) The probability of attendance of water demand for the planting of the month of June showed to be the most feasible considering the cycle of cane plant and their new cycle.