Análises técnicas e econômicas no sistema de integração lavoura-pecuária submetido à adubação nitrogenada

Costa, Nídia Raquel; Andreotti, Marcelo; Gioia, Máila Terra; Tarsitano, Maria Aparecida Anselmo; Pariz, Cristiano Magalhães; Buzetti, Salatiér

doi:10.1590/s0034-737x2012000500004

Cited by 5 publications

(6 citation statements)

References 11 publications

(9 reference statements)

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“…However, in corn production systems, the need for fertilizers is known as one of the factors that increases the production costs (COSTA et al, 2012b); in addition, its misuse can cause environmental harm. However, it is known that inoculating corn seeds with diazotrophic bacteria can improve the crop nitrogen supply (DARTORA et al, 2013;KAPPES et al, 2013) and can thereby reduce the need for externally applied nitrogen fertilizers.…”

Section: Introductionmentioning

confidence: 99%

Inoculation of Diazotrophic Bacteria and Nitrogen Fertilization in Topdressing in Irrigated Corn

et al. 2016

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-Corn is a nitrogen-intensive crop, and the use of management practices such as inoculation of the seed with diazotrophic bacteria, which can maximize crop productivity and reduce the need of nitrogen fertilizers, may result in lower production costs. The present study aimed to evaluate the effect of inoculation of corn seed with Azospirillum brasilense and controlled addition of nitrogen to topdressing on the nutrition, production components, and productivity of crop grain. The experimental design was a randomized block design, with four replications in a 2 × 5 factorial scheme. The treatments consisted of inoculation or not of corn seed with A. brasilense (at 100 mL per 25 kg of seed) and five nitrogen (N) levels in topdressing (0, 30, 60, 90, and 120 kg N ha -1 from urea [45% N]) were applied when the corn was in the phenological growth stage V6. Foliar macronutrients, foliar chlorophyll index (FCI), production components, and yield of corn grain were valuated. Inoculation of corn seeds with A. brasilense increased plant height and grain yield. Fertilization in topdressing, with N levels up to 120 kg ha -1 , linearly increased the foliar nutrients and productivity of corn cultivated in the spring/summer in the low-altitude Cerrado region of Brazil.Keywords: Azospirillum brasilense. Zea mays. nitrogen. no-tillage system. INOCULAÇÃO DE BACTÉRIA DIAZOTRÓFICA E ADUBAÇÃO NITROGENADA DECOBERTURA EM MILHO IRRIGADO RESUMO -O milho é uma cultura exigente em nitrogênio e a utilização de práticas de manejo como a inoculação das sementes com bactérias diazotróficas, poderão maximizar a produtividade da cultura, atrelados a redução do uso de adubos nitrogenados, podendo refletir em menor custo de produção. O presente trabalho objetivou avaliar o efeito da inoculação de sementes de milho com Azospirillum brasilense e adição controlada de nitrogênio em cobertura sobre a nutrição, componentes da produção e produtividade de grãos da cultura. O delineamento experimental foi o de blocos casualizados, com quatro repetições, em esquema fatorial 2 x 5. Os tratamentos foram constituídos pela inoculação ou não das sementes do milho com A. brasilense (dose de 100 mL para 25 kg de sementes) e cinco doses de nitrogênio (N) em cobertura (0, 30, 60, 90 e 120 kg N ha -1 fonte ureia [45% N]) foram aplicadas quando o milho estava no estádio fenológico V6. Teores de macronutrientes foliares, o índice de clorofila foliar (FCI), os componentes da produção e a produtividade de grãos do milho foram avaliados. Constatou-se que a inoculação das sementes de milho com A. brasilense incrementou a altura de plantas e a produtividade de grãos. A adubação em cobertura, com a dose de até 120 kg N ha -1 , aumentou linearmente os teores nutricionais foliares e a produtividade de grãos do milho irrigado cultivado na primavera/ verão na região de Cerrado de baixa altitude do Brasil.Palavras-chave: Azospirillum brasilense. Zea mays. nitrogênio. sistema plantio direto.

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Section: Introductionmentioning

confidence: 99%

Inoculation of Diazotrophic Bacteria and Nitrogen Fertilization in Topdressing in Irrigated Corn

et al. 2016

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“…Under these conditions, for the efficient implementation and management of NTS, crop rotation using species with high potential for straw production and high C/N ratio is essential to ensure soil coverage for a longer period. Corn (Zea mays) and the brachiarias Urochloa brizantha and Urochloa ruziziensis, especially the latter, stand out for the easy drying and less tiller cluster formation, which promote a more uniform soil coverage and facilitate the next crop sowing (Fiorentin et al, 2011;Costa et al, 2012b;Rodrigues et al, 2012;Sabundjian et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Agronomic performance of common bean in straw mulch systems and topdressing nitrogen rates in no-tillage

et al. 2015

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In no-tillage systems, straw coverage on soil surface is the key to success, and the choice of crops for rotation is crucial to achieve the sustainability and quality that conservation agriculture requires. The objective of this study was to evaluate the agronomic performance of the common bean cultivar IAC Formoso sown in succession to three straw mulch systems (corn alone, corn/Urochloa ruziziensisintercrop and U. ruziziensisalone) and topdress nitrogen rates (0; 40; 80; 120 and 160 kg ha-1N), at the four-leaf stage, three years after the implementation of no-tillage. The experiment was arranged in a randomized block split plot design, with three replications. Common bean highest yields were achieved in succession to U. ruziziensisalone and intercropped with corn. The corn/U. ruziziensisintercrop provided both straw and seed production, allowing for quality no-tillage. Topdressed nitrogen influenced the common bean yield when in succession to corn alone, U. ruziziensisalone and corn/U. ruziziensisintercrop in no-tillage.

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“…This grass species does not regenerate as fast as 'Mombaça' grass, and it produces straw that inhibits weed development. Costa et al (2012) also observed that the yield of beans increased when they grew on straw from forages of the genus Urochloa.…”

Section: Resultsmentioning

confidence: 84%

“…Fifty-three percent of the operational costs were invested in the harvest, and 74% of the input costs were invested in pest control products, soil-acidity amelioration, and fertilizers. Since corn is highly dependent on soil fertility for maximum yield (Costa et al, 2012), and it does not fix nitrogen, it demanded the highest fertilizer costs of the three crops studied. The profitability indicator data are presented in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Economic analysis of sorghum consortia with forages or with dwarf pigeon pea succeeded by soybean or corn

Pascoaloto

Andreotti

Cruz

et al. 2017

Pesq. agropec. bras.

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The objective of this work was to determine the most economically viable integrated no-tillage crop-livestock system by intercropping sorghum with tropical forages or dwarf pigeon pea, succeeded by soybean or corn, over a two-year period. The experiment was carried out in a randomized complete block design with four replicates. The treatments consisted of forage sorghum intercropped with: 'Marandu' grass; 'Marandu' grass and dwarf pigeon pea; 'Mombaça' grass; 'Mombaça' grass and dwarf pigeon pea; and dwarf pigeon pea and single sorghum, harvested for silage in the first cut and regrowth, succeeded by soybean or corn. The following calculations were made: effective operational cost, total operational costs, gross revenues, operational income, profitability index, equilibrium price, and equilibrium productivity. These variables were determined for individual crops, as well as for the sum of the crops occupying the same area over time. The sorghum consortia with 'Mombaça' grass, with or without dwarf pigeon pea, had 18 and 14% lower productivity and profitability, respectively, than the sorghum consortia with 'Marandu' grass, with or without dwarf pigeon pea. Soybean in succession requires less chemical control of the 'Mombaça' grass than corn in succession.

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Análises técnicas e econômicas no sistema de integração lavoura-pecuária submetido à adubação nitrogenada

Cited by 5 publications

References 11 publications

Inoculation of Diazotrophic Bacteria and Nitrogen Fertilization in Topdressing in Irrigated Corn

Inoculation of Diazotrophic Bacteria and Nitrogen Fertilization in Topdressing in Irrigated Corn

Agronomic performance of common bean in straw mulch systems and topdressing nitrogen rates in no-tillage

Economic analysis of sorghum consortia with forages or with dwarf pigeon pea succeeded by soybean or corn

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