RESUMO:A utilização da irrigação deve ser extremamente criteriosa, uma vez que faz uso de um recurso natural muito importante devido à sua iminente escassez, a água. A seleção de variedades mais responsivas a irrigação possui também um impacto importante no que tange ao aumento de produtividade desde que a cultura esteja bem alocada no ambiente de produção.O experimento foi conduzido na Estação Experimental do Camaratuba (Mamanguape-PB), visando avaliar características agronômicas de duas variedades de cana-de-açúcar, em delineamento experimental em blocos casualizados, com 3 repetições, no esquema fatorial 2x2, sendo os fatores dois manejos de irrigação (regimes hídricos de sequeiro e com irrigação subsuperficial utilizando tubos porosos) e duas cultivares de cana-de-açúcar (RB 92579 e RB 002754) perfazendo assim 12 parcelas experimentais. A irrigação da cana-de-açúcar aumentou significativamente a altura da planta e o diâmetro dos colmos, sendo a variedade RB92579 a que apresentou os melhores resultados. PALAVRAS-CHAVE: Tubos poroso, ambiente de produção, variedade RB92579 COMPARATIVE STUDY OF TWO SUGAR CANE VARIETIES CULTIVATED UNDER DIFFERENT HYDRIC REGIMESABSTRACT: The use of irrigation must be extremely judicious, since it makes use of a very important natural resource due to its imminent scarcity: the water. The selection of more responsive varieties to irrigation have also an important impact when it comes to the increase of productivity as long as the culture is well located in its production environment. The experiment was conducted in the Camaratuba Experimental Station located in Mamanguape-PB, in a 2x2 factorial scheme with randomized blocks and three replicates summing 12 experimental plots. The factors were two irrigation management schemes (dry farming and subsurface irrigation using porous tubes) and two sugar cane varieties (RB92579 and 1 Doutor, professor UFCG/CES/UAE.
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