Abstract
ABSTRACT This study aimed to evaluate the stalk yield of ten sugarcane cultivars (RB962962, RB931011, RB931530, RB98710, RB92579, RB867515, RB863129, SP791011, RB72545 and VAT90212) subjected to water deficit, full irrigation and water surplus by subsurface drip irrigation, during three cropping seasons (2011-2014). The experiment was conducted at the Experimental Field of Embrapa Meio-Norte, Teresina, Piauí State, Brazil, in dystrophic Red Yellow Argisol. The cultivars RB962962 (162.3 Mg ha-1) and RB867515 (158.5 Mg ha-1) have better stalk yield compared with other cultivars in all water regimes and cropping seasons.
Highlights
In the Northeast region, sugarcane agribusiness is already well consolidated in the states of Alagoas, Paraíba and Pernambuco
The different water regimes (WRs) were always applied on Mondays, Wednesday and Fridays, replacing the ETo accumulated in the period between two consecutive irrigations
In the cropping season of 2011-2012, during the period of imposition of the different water regimes (DWRs), there was an effective rainfall (Pef) of 187.8 mm, which damaged the application of the water deficit (WD) regime for the evaluated varieties
Summary
In the Northeast region, sugarcane agribusiness is already well consolidated in the states of Alagoas, Paraíba and Pernambuco. The crop has occupied areas in non-traditional regions, especially in the states of Tocantins, Maranhão and Piauí, due to their characteristics of soil, topography, climate (solar radiation) and favorable logistic conditions of exportation (MAPA, 2006). These potential areas are situated in regions with semi-arid to dry sub-humid climate, with irregular rainfall (800 to 1200 mm per year) (Bastos & Andrade Júnior, 2014) and that do not meet the water demand of the crop during its cycle, requiring the use of irrigation to achieve satisfactory yield levels. For the genotype-environment interaction, it is crucial to conduct tests aiming at the expression of the productive potential of the sugarcane cultivars in different water regimes and production environments (Silva et al, 2008)
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