Uniformidade da irrigação por aspersão na cultura da cana-de-açúcar em dois estádios de desenvolvimento

Abstract

The aim of this work was evaluated the effect of two sugar cane development stages on the water distribution characteristics above and underneath the soil surface. The experiment was carried out in field at the Estação Experimental de Cana-de-Açúcar de Carpina (EECAC) from October to November, 2014. It was used a cultivated area with sugar cane ratoon in two stages of development (low cane and high cane, respectively, with 100 and 360 days after the first harvest). The sprinkler was located in the middle of the area whose approximate measures are 44 x 44 meters, being half of the area occupied by low cane and the other half by high cane. It was marked in a symmetric way around the sprinkler, spots to measure the precipitated depth, as well as the soil moisture, before and after the irrigation, forming in a regular grid of 4 x 4 meters. To simulated different spacings among the sprinklers it was used the Catch 3D software. The Christiansen uniformity coefficient (CUC) and distribution uniformity coefficient (CUD), the average precipitated depth and the average infiltrated depth were determined, considering the two development stages of the culture. It was observed at the end of the experiment that the uniformity of precipitation distribution in low cane was bigger than that observed in high cane. There was no difference between the infiltration and precipitation uniformity for the high cane. The infiltrated and precipitated depth are equivalent to the high cane.