The objective of this study was to evaluate green grain yield, production components and water use efficiency for cowpea-bean under different water regimes. The experiment was carried out at Embrapa Meio-Norte, in Teresina, PI, Brazil, from September to November 2009. Five irrigation blades, based on reference evapotranspiration fractions (25, 50, 75, 100, and 125 of ETo), and the evaluated cowpea-ben cultivars were BRS Guariba and BRS Paraguacu. Irrigation was performed by conventional fixed sprinkling system. The experimental design was a randomized complete block with four replicates, in a split-plot arrangement (cultivars). Maximum green grain yields achieved 2,937.3 kg ha(-1) for BRS Guariba and 2,492.9 kg ha-1 for BRS Paraguacu; these productivities were obtained under 354 mm and 423 mm irrigation blade, respectively. The irrigation blades of 275 mm and 231 mm for BRS Guariba and BRS Paraguacu cultivars, respectively, accomplished the most efficiency in water use for green grain yield. BRS Guariba shows a better performance compared with BRS Paraguacu.
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机译：本研究旨在评价不同水态下豇豆的绿色籽粒产量、生产成分和水分利用效率。该实验于2009年9月至11月在巴西PI特雷西纳的Embrapa Meio-Norte进行。根据参考蒸散分数（ETo 的 25%、50%、75%、100% 和 125%）和评估的豇豆本品种，五个灌溉叶片是 BRS Guariba 和 BRS Paraguacu。灌溉采用传统的固定喷灌系统进行。实验设计是一个随机的完整块，有四个重复，采用分割地块排列（品种）。BRS Guariba和BRS Paraguacu的最大绿色谷物产量分别为2,937.3 kg ha（-1）和2,492.9 kg ha-1;这些生产力分别在 354 mm 和 423 mm 灌溉刀片下获得。BRS Guariba 和 BRS Paraguacu 品种的灌溉叶片分别为 275 毫米和 231 毫米，在绿色谷物产量的用水效率最高。与BRS巴拉瓜苏相比，BRS瓜里巴表现出更好的表现。
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