Resposta da cana-de-açúcar irrigada, 1ª soca, a diferentes níveis de adubação nos tabuleiros costeiros paraibanos.

Abstract

In the traditional áreas and mainly in the áreas of expansion of the culture canavieira in Brazil, the manuring constitutes fundamental practice mainly for the reach of larger productivities when associated the practice of the irrigation. With the objective of studying the behavior of the sugar-cane, (Saccharum L., variety SP 79 1011) first it beats, irrigated and not irrigated under different manuring leveis an experiment it was developed in Fazenda Capim, of property of the distillery Miriri, municipal district o f Grass, PB. The experimental arrangement was accomplished through a factorial analysis of the type 2 x 4 (with and without irrigation and four leveis of covering manuring, N I , N2, N3 and N4) with three repetitions, totaling 24 different combinations. The sheet of used irrigation, 27,5 mm, was applied in intervals of irrigation of 12 days. The covering manurings were composed of the elements N and K 2 0 in defined amounts, being taken as base the leveis recommended by the consultants' of the Destilaria M i r i r i team, being: N I =85 (levei used in the farm 44 kg have-1 of nitrogen and 41 kg have-1 of potassium); N2=167 (86 kg have-1 of nitrogen and 81 kg have-1 of potassium); N3=305 (157 kg have-1 of nitrogen and 148 kg have-1 of potassium); and N4=458 kg have-1 (236 kg have-1 of nitrogen and 222 kg have-1 of potassium). the culture when submitted to the irrigation it presented better revenue in ali'the appraised variables, when compared to the irrigation absence. As larger the manuring levei, in the studied interval, adult was the revenue of the appraised variables. Among the parameters organográficos studied the weight o f the stem it was not just influenced by the analyzed treatments. The technological parameters o f the sugar-cane answered significantly to the treatment irrigation that didn't happen with the treatment covering manuring and the interaction among treatments. The productivity of alcohol and of sugar it increased with the increase of the manuring levei, in both studied regimes, however, it was observed that as larger the levei of larger manuring the productivity difference among the irrigated regime o f the no irrigated.