Cultura associada de feijão e milho. XII - adubações nitrogenada e molíbdica
Loading...
Files
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Revista Ceres
Abstract
Foram instalados em Coimbra, MG, três experimentos em fatorial 2 x 2 x 2, em que os fatores foram: sistemas de produção (monocultivo de milho e consórcio milho-feijão), adubação nitrogenada em cobertura (0 e 40 kg/ha de N) e adubação molíbdica foliar (0 e 50 g/ha de Mo). Todos os
tratamentos receberam, no plantio, a adubação de 600 kg/ha de 4-14-8. Estirpes nativas de rizóbio povoavam os solos utilizados. O milho foi plantado no espaçamento de 1,0 m entre fileiras e na densidade correspondente a 40 mil plantas por hectare. No consórcio, o feijão (densidade de, aproximadamente, 150 mil plantas/ha) foi semeado dentro
das fileiras do milho. Nos dois primeiros experimentos, utilizaram-se a variedade de milho ‘Ag 210’ e o feijão ‘Ouro Negro'; no terceiro, o milho ‘Ag 6601’ e o feijão ‘Ouro’. O Mo teve efeito sobre a leguminosa, ou aumentando-lhe a produção (cerca de 40%) ou o teor de N no tecido vegetal (perto de 41%) ou ambos. O feijão consorciado diminuiu o rendimento do milho em cerca de 26% em média. Houve apenas indícios de ação do Mo sobre o milho. 0 N aumentou a produção do milho em 44% num experimento.
In Coimbra, MG, Brazil, three 2^3 factorial experiments were carried out, in which the factors were: production systems (maize monocrop and maize associated with beans), side-dressing application of N fertilizer (O and 40 kg of N per ha), and foliar application of molybdenum (0 and 50 g of Mo per ha). Ali treatments received 600 kg/ha of the mixture 4-14-8 at planting time. The soils contained native strains of Rhizobium. Maize was planted in rows 1.0 m apart, at a density of 40 thousand plants/ha; beans were pianted within maize rows at a density of approximately 150 thousand plants/ha. The maize cultivar ‘Ag 210’ and the bean cultivar ‘Ouro Negro' were used in two experiments and ‘Ag 6601’ and ‘Ouro’ in the third. Mo had a positive effect on beans, increasing either the yield (about 40%) orthe tissue N content (about 41%) or both. Maize yield had a mean decrease of 26% when associated with beans. Some indications of Mo effect on maize were found. In one experiment N application increased maize yield by 44%.
In Coimbra, MG, Brazil, three 2^3 factorial experiments were carried out, in which the factors were: production systems (maize monocrop and maize associated with beans), side-dressing application of N fertilizer (O and 40 kg of N per ha), and foliar application of molybdenum (0 and 50 g of Mo per ha). Ali treatments received 600 kg/ha of the mixture 4-14-8 at planting time. The soils contained native strains of Rhizobium. Maize was planted in rows 1.0 m apart, at a density of 40 thousand plants/ha; beans were pianted within maize rows at a density of approximately 150 thousand plants/ha. The maize cultivar ‘Ag 210’ and the bean cultivar ‘Ouro Negro' were used in two experiments and ‘Ag 6601’ and ‘Ouro’ in the third. Mo had a positive effect on beans, increasing either the yield (about 40%) orthe tissue N content (about 41%) or both. Maize yield had a mean decrease of 26% when associated with beans. Some indications of Mo effect on maize were found. In one experiment N application increased maize yield by 44%.