Avaliação do feijão-mungo (Vigna radiata (l.) Wilczeck) e do feijão-arroz (Vigna umbellata (thunb.) Ohwi & ohashi) em diferentes populações de plantas
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Revista Ceres
Abstract
Foram conduzidos dois ensaios para determinar a população de plantas que proporcionasse 0 maior rendimento de grãos e o maior valor agronômico do feijão-mungo e do feijão-arroz. Os tratamentos foram: realizados com 100.000 plantas/ha, 200.000 plantas/ha, 300.000 plantas/ha, 400.000 plantas/ha e 500.000 plantas/ha. O delineamento experimental foi feito em blocos casualizados com quatro repetições. Para o feijão-mungo, o plantio foi realizado em novembro de 1994, com espaçamento entre fileiras de 0,40 m e adubação de 200 kg/ha de 4-14-8. Não foi realizada adubação de cobertura. Quanto ao feijão-arroz, o plantio foi realizado em fevereiro de 1995, com espaçamento entre fileiras de 0,60 m, adubação de 200 kg/ha de 4-14-8 e adubação de cobertura com 20 kg/ha de nitrogênio. O rendimento de grãos em função da população de plantas ajustou-se a um modelo quadrático. A população de plantas não afetou a altura destas plantas e a altura de inserção da primeira vagem de ambas as culturas. Com relação ao feijão-mungo, o maior número médio de vagens por planta ocorreu na população de 300 mil plantas/ha. Quanto ao feijão-arroz, 0 número médio de semente por vagem e o comprimento de vagem diminuíram com o aumento da população de plantas. A população de plantas que proporcionou o maior rendimento de grãos para o feijão-mungo (940 kg/ha) e para o feijão-arroz (1.059 kg/ha) foi de 300 mil/ha.
Two experiments were carried out to determine the mung bean and rice bean plant populations that would provide the highest yield. The following treatments were used: 100,000, 200,000, 300,000, 400,000 and 500,000 plants/ha. The experiments were arranged in a randomized block design with four replicates. Mung bean planting was conducted in November 1994 with row spacing of 0.4om and 200 kg/ha of 4-14-8 fertilization. Nitrogen was not applied. Rice bean planting was conducted in February 1995 with row spacing of 0.6om, 200 kg/ha of 4-14-8 fertilization and 20 kg/ha of nitrogen. Grain yield as a function of plant population was fitted to a quadratic model. Plant height and height of insertion of first pod for both cultures were not affected by plant population. For mung beans, the highest mean number of pods per plant/ha occurred in the 300,000 plants/ha population. For rice bean, the mean number of seeds per pod and pod length decreased with the increase of population. The plant pºpulation showing the highest grain yield for mung beans (940 kg,/ha) and for rice beans (1,059 kg/ha) was 300,000 ha.
Two experiments were carried out to determine the mung bean and rice bean plant populations that would provide the highest yield. The following treatments were used: 100,000, 200,000, 300,000, 400,000 and 500,000 plants/ha. The experiments were arranged in a randomized block design with four replicates. Mung bean planting was conducted in November 1994 with row spacing of 0.4om and 200 kg/ha of 4-14-8 fertilization. Nitrogen was not applied. Rice bean planting was conducted in February 1995 with row spacing of 0.6om, 200 kg/ha of 4-14-8 fertilization and 20 kg/ha of nitrogen. Grain yield as a function of plant population was fitted to a quadratic model. Plant height and height of insertion of first pod for both cultures were not affected by plant population. For mung beans, the highest mean number of pods per plant/ha occurred in the 300,000 plants/ha population. For rice bean, the mean number of seeds per pod and pod length decreased with the increase of population. The plant pºpulation showing the highest grain yield for mung beans (940 kg,/ha) and for rice beans (1,059 kg/ha) was 300,000 ha.