Efeito da densidade de plantio em cultivares de feijão-de-corda [Vigna unguiculata (L.) Walp] sob condições de irrigação

• Ano de defesa: 1995
• Autor(a) principal: Carvalho, Wellington Pereira de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Agronomia
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/47480

A field experiment was carried out in Fortaleza, Ceará, Brazil, from November 1994 to February 1995, with the objectives of studying the behavior of ten cowpea cvs (Vigna unguiculata (L) Walp), from the Federal University of Ceará germoplasm bank, with differences in growth habit, in two population densities (41.666 and 125.000 plants/ha), under irrigation conditions. The cvs differed in L maximum, percentage and days to reach maximum percentage of solar radiation interception, number of flowers/plant, reproductive efficiency, number of lateral branches/plant, plant size, number of pods/plant, weigh of 100 grains, number and weigh of grains/pod, pod length, grain yield/plant and grain yield/ha. The maximum L, the percentage of solar radiation interception, and the grain yield/ha increased with the higher population (125.000 plants/ha). On the other hand, the number of days required for interception of maximum solar radiation, the number of flowers/plant, the number of lateral branches, and the number of grains and pods per plant were reduced with the increase of plant population. Plant density had no influence on reproductive efficiency, number of pod/plant, weigh of 100 grains, number and weigh of grains per pod and pod length. The cvs showed low values for L maximum, varying from 1,24 (41.666 plants/ha) to 2,76 (125.000 plants/ha). Cowpea was not able to intercept the total solar radiation that reached the crop, with average levels of maximum interception varying from 47,02% to 73,13% at the low and high plant population, respectively. The cv CE 670, intermediate spreading buch type, had the higher average yield over the two plant populations, showing an outstanding plasticity to extreme population densities. The cv CE 116, a buch type, had the higher grain yield when planted in the 125.000 plants/ha population. The hypothesis that under irrigation conditions the buch type cvs show a better yield response to increase in planting density as compared to the prostate/creeping type cvs, was not confirmed under the population limits studied. The grain yield/ha was positively correlated to the number of grains/pod, plant size and grain yield/plant.