The cowpea represents one of the most important agricultural species of the brazilian Northeast, and proper management of mineral fertilizer that culture becomes essential to their production. The present work aimed to study the effect of the interaction between potassium and phosphorus in the presence of the inoculant INPA 03-11B in the culture of cowpea for Production Pole of Bom Jesus, Piaui, Brazil. The experiment was conducted in the experimental area of the Federal University of Piaui, Campus of Bom Jesus, PI, about a Quartzarenic Neosol. The experimental design was a randomized block with four replications. The treatments consisted of four levels of potassium (0, 35, 70 and 105 kg K 2 O ha -1 ) and four levels of phosphorus (0, 40, 80 and 120 kg P 2 O 5 ha -1 ). Nodule number, nodule dry and fresh biomass, shoot dry biomass and grain yields were evaluated. The potassium and phosphorus levels and their interaction affected nodulation and parameters indicators of production of cowpea. The interaction between the phosphorus and potassium levels favored the nodulation, shoot dry biomass and grain yield. The highest grain yield of cowpea was obtained with the fertilization of 67.73 kg of P 2 O 5 ha -1 and 35 kg of K 2 O ha -1 .
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机译：pea豆是巴西东北部最重要的农业品种之一，对矿物肥料的适当管理使养殖成为其生产所必需的。本工作旨在研究在巴西皮奥伊邦伯耶生产极的of豆培养物中，在接种INPA 03-11B的pea豆培养物中钾和磷之间的相互作用的影响。该实验是在皮尤邦联邦耶稣大学校园的皮奥伊联邦大学实验区进行的，该实验区是关于石英的新溶胶。实验设计是具有四个重复的随机区组。处理包括四个水平的钾（0、35、70和105 kg K 2 O ha -1）和四个水平的磷（0、40、80和120 kg P 2 O 5 ha -1）。评价根瘤数，根瘤干和新鲜生物量，茎干生物量和谷物产量。钾和磷水平及其相互作用影响affected豆的结瘤和参数指标。磷和钾水平之间的相互作用有利于结瘤，茎干生物量和籽粒产量。施肥67.73 kg的P 2 O 5 ha -1和35 kg的K 2 O ha -1可获得最高的pea豆籽粒产量。
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