Plantas de cobertura e seus efeitos sobre o feijoeiro em plantio direto

Oliveira, T. K. de; Carvalho, Gabriel José de; Moraes, R. N. de S.

doi:10.1590/s0100-204x2002000800005

Cited by 116 publications

(115 citation statements)

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“…Jack bean and pearl millet showed the lowest K contents (Table 2); however, due to great dry matter production, jack bean had higher accumulated values of K than sunn hemp and pearl millet, differing from values described in the literature. Contents found in this study are higher than those observed by Oliveira et al (2002) and Ceretta et al (1994).…”

Section: Discussioncontrasting

confidence: 79%

“…Oliveira et al (2002), working with same species, observed less amounts of P than those found in the current study due to minor dry matter content and production. Conversely, Fernandes et al (2005) obtained higher amounts of P. Regarding sunn hemp, Silva et al (2006) found larger P quantities than this study, as a result of higher dry matter production.…”

Section: Discussioncontrasting

confidence: 77%

“…The P content in jack bean tissues was superior to those obtained in other studies (Fernandes et al 2007;Oliveira et al 2002). Apart from soil factors, weather and climatic variation during the year may influence nutrient uptake by plants.…”

Section: Discussioncontrasting

confidence: 63%

“…Jack bean showed a superior yield than that cultivated in the Cerrado (3.43 t ha -1 ). Moreover, pearl millet had better development under Cerrado conditions, producing 14.18 t ha -1 (Oliveira et al 2002). The low dry matter production of legumes, including jack bean, may be related to the lack of fertilization and inoculation (Oliveira et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, pearl millet had better development under Cerrado conditions, producing 14.18 t ha -1 (Oliveira et al 2002). The low dry matter production of legumes, including jack bean, may be related to the lack of fertilization and inoculation (Oliveira et al 2002). For the same species, different yields between regions can reflect variation in soil properties and weather conditions, emphasizing the importance of regional studies for NT.…”

Section: Discussionmentioning

confidence: 99%

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Grasses and legumes as cover crop in no-tillage system in northeastern Pará Brazil

et al. 2014

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Studies to select one or more species of coverage plants adapted to Amazonian soil and climate conditions of the Amazon are a promising strategy for the improvement of environmental quality, establishing no-till agricultural systems, and thereby reducing the impacts of monoculture farming. The aim of this study was to assess the persistence time, half-life time, macronutrient content and accumulation, and C:N ratio of straw coverage in a Ultisol in northeastern Pará. Experimental design was randomized blocks with five treatments and five replicates. Plants were harvested after 105 days, growth and biomass production was quantified. After 84 days, soil coverage was 97, 85, 52, 50, and 15% for signalgrass (Brachiaria brizantha) (syn. Urochloa), dense crowngrass (Panicum purpurascens), jack bean (Canavalia ensiformes), pearl millet (Pennisetum americanum) and sunn hemp (Crotalaria juncea,), respectively. Signalgrass yielded the greatest dry matter production (9,696 kg ha -1 ). It also had high C:N ratio (38.4), long half-life (86.5 days) and a high persistence in the field. Jack bean also showed high dry matter production (8,950 kg ha -1 ), but it had low C:N ratio (17.4) and lower half-life time (39 days) than the grasses. These attributes indicate that signalgrass and jack bean have a high potential for use as cover plants in no-till agricultural systems in the State of Pará. KEYWORDS: Half-life, persistence of plant biomass, recycling nutrients, C / N ratio Gramíneas e leguminosas como plantas de cobertura para o sistema de plantio direto no nordeste do estado do Pará RESUMO Estudos que visem à seleção de espécies, ou de grupos de espécies de plantas de cobertura do solo adaptadas as condições edafoclimáticas amazônicas parece ser uma estratégia viável para a melhoria da qualidade ambiental por propiciar o estabelecimento do SPD atenuando problemas relacionados ao monocultivo. O objetivo foi avaliar o comportamento de plantas de cobertura, no Nordeste paraense, quanto a persistência, tempo de meia vida, teor e acúmulo de macronutrientes e relação C/N na palhada, em Argissolo Vermelho Amarelo. O delineamento experimental foi em blocos ao acaso, com cinco tratamentos e cinco repetições. As plantas foram cultivadas a partir do mês de julho e cortadas aos 105 dias de cultivo e então foi feita a avaliação da produção. Ao final dos 84 dias a percentagem de cobertura do solo correspondeu a 97, 85, 52, 50 e 15%, para a braquiária (Brachiaria brizantha) (syn. Urochloa), capim colônia (Panicum purpurascens), feijão de porco (Canavalia ensiformes), milheto (Pennisetum americanum) e crotalária (Crotalaria juncea,), respectivamente. A braquiária apresentou maior produção de matéria seca (9.696 kg ha -1 ), elevada relação C/N (38,4), alto tempo de meia vida (86,5 dias) e grande persistência no campo. O feijão de porco apresentou alta produção de matéria seca (8.950 kg ha -1 ), porém menor relação C/N (17,4) e tempo de meia vida (39 dias), quando comparada as gramíneas. Por estas características, a braquiária e o feijã...

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Section: Discussioncontrasting

confidence: 79%

Section: Discussioncontrasting

confidence: 77%

Section: Discussioncontrasting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Grasses and legumes as cover crop in no-tillage system in northeastern Pará Brazil

et al. 2014

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Considerations for Unharvested Plant Potassium

Rosolem

Mallarino

Nogueira

2020

Improving Potassium Recommendations for Agricultural Crops

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Potassium (K) is found in plants as a free ion or in weak complexes. It is easily released from living or decomposing tissues, and it should be considered in fertilization programs. Several factors affect K cycling in agroecosystems, including soil and fertilizer K contributions, plant K content and exports, mineralization rates from residues, soil chemical reactions, rainfall, and time. Soil K+ ions can be leached, remain as exchangeable K, or migrate to non-exchangeable forms. Crop rotations that include vigorous, deep-rooted cover crops capable of exploring non-exchangeable K in soil are an effective strategy for recycling K and can prevent leaching below the rooting zone in light-textured soils. The amount of K released by cover crops depends on biomass production. Potassium recycled with non-harvested components of crops also varies greatly. Research with maize, soybean, and wheat has shown that 50–60% of K accumulated in vegetative tissues is released within 40–45 days. A better understanding of K cycling would greatly improve the efficacy of K management for crop production. When studying K cycling in agricultural systems, it is important to consider: (1) K addition from fertilizers and organic amendments; (2) K left in residues; (3) K partitioning differences among species; (4) soil texture; (5) soil pools that act as temporary sources or sinks for K. In this chapter, the role of cash and cover crops and organic residues on K cycling are explored to better understand how these factors could be integrated into making K fertilizer recommendations.

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