Desempenho de variedades de cana-deaçúcar em duas épocas de colheita no Pontal do Paranapanema

Abstract

In the world agricultural scenario, Brazil stands out as the largest producer and exporter of sugarcane derivatives, thus, the increase of this crop productivity is of great interest, and one of the ways to obtain this increase is by knowing the agronomical performance of the varieties available for cultivation. Through this knowledge, it is possible to propose management that aim to allocate commercial cultivars to the different production environments available at the mills in their respective harvest seasons, thus obtaining conditions to improve the agricultural yield. In this context, the objective of this paper was to study the agronomical behavior of different sugarcane varieties, which ones were submitted to three successive cuts and two harvest seasons. The experiment was implemented at Fazenda Boa Vista III, located in the city of Teodoro Sampaio, region of Pontal do Paranapanema-SP. The edaphoclimatic environment was classified as D2. The planting was carried out in May 2011. The experiments were composed by twenty-four sugarcane varieties, being CTC2, CTC4, CTC6, CTC7, CTC9, CTC11, CTC14, CTC15, CTC16, CTC17, CTC19, CTC20, CTC24, CTC9004M, IACSP95- 5000, SP81-3250, SP80-1842, RB937570, RB867515, RB845210, RB92579, RB966928, RB855156, RB855453. The experimental unit (plot) was composed of 4 grooves of 20 meters, with spacing of 1,5 m between the grooves and 15 gems per linear meter in the planting. The harvest was carried out during the months of April and October and the productivity (TCH) was determined; sucrose and fiber content, later, it was determined the yield of TPH (TONS OF POL PER HECTARE) from the varieties. The data were submitted to analysis of variance (p <0.01), and the averages compared by the Scott & Knott test (p <0.05). In the experiment where the harvest was carried out in April, the varieties CTC20, CTC16 and RB966928 reached higher level of sucrose, sugarcane yield and sugar content per area, regardless of successive cuts. The varieties CTC16, SP80-1842 and RB966928 provided higher fiber content in all the successive cuts. In the sugarcane harvest carried out in October, the varieties CTC4, CTC20, RB937570, RB867515, CTC15 and CTC9004M provided the highest yield of POL, while the CTC20 variety presented highest content of sucrose and sugarcane yield, regardless of successive cuts. The CTC14 and CTC24 varieties provided the highest fiber content, in the first two evaluated cuts. The effect of the sugarcane harvest season was significant for all the evaluated years, being October the best harvest season for all the evaluated varieties.