Abstract
Aiming at verifying different straws and nitrogen levels effects on common bean no-till, a study was carried out at Federal University of Lavras (Lavras, Minas Gerais, Brazil). The experiment design utilized was randomized blocks and four replications in split plot arrangement, with five straws (millet, jack bean, dwarf guandu, millet + jack bean and millet + dwarf guandu) in the plots and four nitrogen levels (0, 50, 100 and 150 kg ha-1) in sub-plots. The initial and final stands, plant height, grain yield and its primary compounds were evaluated. Millet straw provided greatest dry bean stand. Jack bean single and intercrops provided the largest hundred-grain weight. Nitrogen rate provided negative linear effect for initial stand, and positive effect on hundred-grain weight. Grain number per pod increased by 106 kg ha-1 N rate and had low reduction after that. There were significant interactions between straws and N rate for plant height, pod per plant and grain yield. Millet + jack bean provided greatest plant height at 115 kg ha-1 N rate. Pod number per plant had linear and positive effect on all straw types and the highest values were observed in intercropping combinations in the maximum N rate. The best grain yield was obtained under millet + jack bean in the largest N rate.
Highlights
Para o sucesso do sistema plantio direto, as experiências dos produtores e os resultados de pesquisa apontam como fator fundamental a rotação/sucessão de culturas, as quais devem ser escolhidas com base na exigência nutricional e exploração pelo sistema radicular, nas pragas e
Vagens por planta de feijoeiro, cultivar BRS-MG Talismã, em diferentes coberturas de solo e doses de nitrogênio no sistema de plantio direto em implantação
Summary
Cícero Monti Teixeira1*, Gabriel José de Carvalho, Messias José Bastos de Andrade, Antônio Eduardo Furtini Neto e Edson Luiz Silva Marques. O maior estande do feijoeiro foi obtido na palhada de milheto. A maior massa de 100 grãos foi obtida com o cultivo sob feijão-de-porco e nos consórcios. As doses de N proporcionaram efeito linear negativo para o estande inicial e positivo para a massa de 100 grãos. Houve interações significativas entre palhadas e doses para altura de plantas, vagens por planta e rendimento de grãos. A maior altura de plantas foi obtida no milheto + feijão-de-porco na dose de 115 kg ha-1 de N. Para o número de vagens por planta, houve efeito linear positivo para todas as palhadas, com os maiores valores sendo obtidos nos consórcios na maior dose. O maior rendimento de grãos foi obtido no milheto + feijão-de-porco na maior dose. Palavras-chave: plantio direto, feijão, plantas de cobertura, adubação nitrogenada
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