Consumo hídrico e coeficiente de cultivo dual da cana de açúcar cultivada sob diferentes lâminas de irrigação.

Abstract

The objective of this work was to determine the water requirements, dual crop coefficient and water use efficiency, as well as to analyze the growth variables of sugarcane cultivated in the coastal tablelands of the State of Paraíba. () experimental design was in randomized blocks, comprising four irrigation treatments with two central pivots, with three replications, using reference evapotranspiration (ETO) in water management, as follows: 25% ETo, 50% ETO , 75% ETO and 100% ETO. The dual cropping coefficient was obtained according to the FAO-56 methodology (: & reference evapotranspiration by the Penman—Monteith method, using air temperature, relative humidity, wind speed and solar radiation data collected at the Collection Platform near the experimental area. The results obtained indicate that soil moisture exerts a greater influence on the height of the stems than on the diameter of the sugarcane plant and that the productivity of the sugarcane is significantly affected by water deficit conditions. Water use efficiency decreases and productivity increases with the increase in the water depth applied to the sugarcane crop and sugarcane evapotranspiration— ranges from 2.69 to 3.92 mm da'.