Abstract
The objective of this study was to evaluate the chemical composition and yield of three sugarcane cultivars grown under Af climate conditions. Three sugarcane cultivars were examined, namely, IACSP93-6006, RB83-5486, and SP79-1011, in a randomized block design with three treatments, four blocks, and two replicates per block; means were compared using Tukey's test at 5% probability level. Significant differences were observed for dry matter, ether extract, crude protein, acid detergent fiber, lignin (LIG), cellulose, neutral detergent fiber corrected for ash and protein (NDFap), total carbohydrates, carbohydrate fractions B2 and C, and dry matter yield. The fiber components (NDFap, LIG, and fraction C) displayed low values. The cultivars produced high dry matter yields, especially IACSP93-6006 and SP79-1011. There were no differences among sucrose (Pol) values and the NDF/Pol ratios. The low Pol values indicate that sugarcane grown under Af climate conditions does not produce high levels of sucrose. The three sugarcane cultivars grown under the Af climate conditions produce high yields of DM/ha but low concentrations of the fiber components, as well as low Pol concentrations.
Highlights
Climatic factors influence sugarcane crops, especially rainfall, air temperature, and solar radiation
Significant differences were observed for dry matter, ether extract, crude protein, acid detergent fiber, lignin (LIG), cellulose, neutral detergent fiber corrected for ash and protein (NDFap), total carbohydrates, carbohydrate fractions B2 and C, and dry matter yield
The present study evaluated the yield and the chemical composition of three sugarcane cultivars grown under Af climate conditions
Summary
Climatic factors influence sugarcane crops, especially rainfall, air temperature, and solar radiation. Each climate type has striking characteristics regarding factors that can influence the yield and technological quality of sugarcane, and the final result represents the interaction of the various conditions to which the crop was subjected (Gilbert et al, 2006). The Af climate type, as defined by the Köppen-Geiger climate classification (better known as the Köppen climate classification), is characterized as a humid tropical climate with rainfall throughout the year, a minimum annual temperature above 18 °C, and no well-defined dry season (Peel et al, 2007). Several studies on sugarcane have been conducted under various climate types: Aw (Cruz et al, 2010; Capone et al, 2011), Am (Townsend et al, 2006), Cwa (Macêdo et al, 2012), Cfa (Muraro et al, 2009), and BSh (Almeida et al, 2008).
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