Cowpea performance as influenced by distinct populations and spacing in southest of Pará
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.002.0013Keywords:
Vigna unguiculata (L.) Walp, Plants spatial distribution, Agronomic characteristics, Grain productivityAbstract
The cowpea productive potential expression depends on the combination of several factors, including the production system used, climate and soil conditions of the cultivation area and practices such as the number of plants per area and spacing between planting lines. In the contexto, the aim was to evaluate the cowpea cv BRS Guariba productivity in different plants populations and spacing under edaphoclimatic conditions in southeast of Pará, Brazilian amazon. For this, was used a randomized block design, in a 2 x 5 factorial, with four replications. The treatments consisted of two spacings: 0.4 and 0.5 m; and five plant populations per hectare: 160.000, 220.000, 280.000, 340.000, 400.000 plants ha-1. Were evaluated the number of pods per plant, number of grains per pod, pod length (cm), grain yield (kg ha-1) and weight of 100 grains (g). The smallest plant population (160.000 plants ha-1) used promoted the highest average number of pods per plant in both spacings. The average pod length was 21.2 cm, which was not influenced by any factors studied. The number of grains per pod was higher in spacing of 0.5 m (11.8) compared to 0.4 m (11.3). However, there was only a difference in the number of grains per pod between the populations within the smallest planting spacing, with emphasis on the largest populations (400.000, 340.000 and 280.000 plants ha-1). Grain productivity ranged from 524.7 to 995.1 kg ha-1, with higher yields corresponding to the populations of 400.000, 340.000 and 280.000 plants ha-1, regardless of the spacing used. On the other hand, the weight of the grains was little changed due to the treatments
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