Weather variables, water balance, growth, and agro industrial yield of sugarcane

Abstract

ABSTRACT:The objective of this study was to evaluate the meteorological variables, water deficiency, growth, and agro-industrial yield of sugarcane varieties: RB72454, RB863129, RB867515, RB92579, RB93509, RB931003, RB951541, and RB971755, in rainfed crop in two harvests in the Rio Largo-AL region. The meteorological variables were obtained in an automatic station and water balance was done by Thornthwaite & Mather method. During the study period, the air temperature ranged from 16.6 to 35.9 ºC. In the first production cycle rained 1,806 mm and the crop evapotranspiration was 1,775 mm. In the second cycle, the rainfall totaled 1,632 mm and the crop evapotranspiration was 1,290 mm. The average water excess of two production cycles was 689 mm and the water deficit totaled 665 mm. The average agricultural productivity in the plant was 86.8 t ha -1 , in the first ratoon was 75.2 t ha -1 and the agro-industrial yield average was 12.9 and 10.9 tons of sugar per hectare in the plant and first ratoon, respectively. The air temperature was not limiting to the growth of sugarcane and the rainfall was higher than the crop evapotranspiration, but due to poor distribution of the rains there was water deficit. The most productive varieties were RB93509, RB92579, and RB863129. No período da pesquisa, a temperatura do ar variou de 16,6 a 35,9º C. No primeiro ciclo de produção, choveu 1.806 mm, e a cultura evapotranspirou 1.775 mm, e, no segundo ciclo, a precipitação pluvial somou 1.632 mm, e a evapotranspiração da cultura foi 1.290 mm. O excesso hídrico médio dos dois ciclos de produção foi 689 mm; e o déficit hídrico, 665 mm. Ou seja, mesmo resultando em uma precipitação pluvial superior à evapotranspiração da cultura, devido à má distribuição das chuvas, houve deficiência hídrica. A temperatura do ar não foi limitante para o crescimento da cana-de-açúcar. A produtividade agrícola média da cana-planta foi 86,8 t ha -1 , em cana-soca foi 75,2 t ha -1 , e o rendimento agroindustrial médio foi 12,9 e 10,9 toneladas de açúcar por hectare em cana-planta e cana-soca, respectivamente. As variedades mais produtivas foram a RB93509, a RB92579 e a RB863129. KEYWORDS PALAVRAS-CHAVE

Economic Depth of Drip Irrigation on Sugarcane

“…The agro-industrial productivity of sugarcane is extremely dependent of the rainfall distribution over the production cycles. This effect was observed by Teodoro et al (2015) and Abreu et al (2013), who found that, in the cycle in which there was a higher water deficit, agricultural and agro-industrial productivity were affected significantly. This, for that the yields from the sugarcane industry are not impaired, depending on the amount and uniformity of rainfall distribution, the use of irrigation is required (TEODORO et al, 2009).…”

Evapotranspiração de canaviais em diferentes fases fenológicas por sensoriamento remoto no vale do submédio do São Francisco.

“…Silva et al (2015), no município de Capim-PB, testando diferentes métodos de estimativa da evapotranspiração, encontraram valores médios ao longo de um ciclo da cultura de 3,74 a 4,86 mm dia -1 . Além de Teodoro et al (2015), que encontraram valores de evapotranspiração de 1,58 a 5,9 mm dia -1 e observaram valores com maior amplitude.…”

Sugarcane productivity simulation under different planting times by DSSAT/CANEGRO model in Alagoas, Brazil

“…Abreu et al (2013) analyzed the productivity of six varieties for three cycles, and this variety stood out in plant crop cultivation. In many variety competition experiments conducted in Northeastern Brazil, this variety has stood out (Abreu et al, 2013;Almeida et al, 2008;Teodoro et al, 2015). For ratoon crop cultivation, the model overestimated by 11%.…”