Caracterização pedométrica de atributos de argissolos coesos do leste Maranhense

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Atributos microbiológicos, químicos e granulométricos de organossolo e latossolos vermelhos: efeito sazonal e uso do solo

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Indicadores de qualidade de um latossolo vermelho e produtividade do milho sob sistemas de manejo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo geoquímico de solos em áreas degradadas no município de Sobral (CE) com vistas à sua recuperação

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Nitrogênio com ou sem calcário superficial para recuperação do capim-marandu

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Diagnose nutricional da goiabeira

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Resposta de cultivares de feijão-caupi a calagem

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Resíduos de indústria de celulose e papel na fertilidade do solo e no desenvolvimento de eucalipto

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Mecanismos fisiológicos de cana-de-açúcar sob efeito da interação dos estresses hídrico e ácido no solo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Crescimento de mudas de Mimosa caesalpiniifolia Benth. e Astronium fraxinifolium Schott em resposta à calagem e adubação fosfatada

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Suscetibilidade magnética e sua associação com atributos do solo e do relevo em uma topossequência de Latossolos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Recuperação de um subsolo de cerrado com cultivo de plantas nativa e introduzidas

Pós-graduação em Agronomia - FEIS

Calagem, adubação e nutrição mineral de Anonáceas

Among the edaphic factors, those related to acidity are the ones that affect productivity, especially in tropical regions. For culture the Annonaceae, no research results that indicate the proper base saturation, nor the determination of doses, times, application methods and sources of nutrients for orchards Annonaceae in training and production in order to promote sustainability and higher yields. Given the importance and potential of commercial exploitation of Annonaceae in Brazil and, considering the limited available scientific information on liming, fertilization and nutrition of fruit plants of this family, some research has to be carried out urgently due to the effects of nutrients on productivity, fruit quality, post-harvest, tolerance to pests and diseases, etc.

Chemical and biological properties of phosphorus-fertilized soil under legume and grass cover (Cerrado region, Brazil)

The use of cover crops has been suggested as an effective method to maintain and/or increase the organic matter content, while maintaining and/or enhancing the soil physical, chemical and biological properties. The fertility of Cerrado soils is low and, consequently, phosphorus levels as well. Phosphorus is required at every metabolic stage of the plant, as it plays a role in the processes of protein and energy synthesis and influences the photosynthetic process. This study evaluated the influence of cover crops and phosphorus rates on soil chemical and biological properties after two consecutive years of common bean. The study analyzed an Oxisol in Selvíria (Mato Grosso do Sul, Brazil), in a randomized block, split plot design, in a total of 24 treatments with three replications. The plot treatments consisted of cover crops (millet, pigeon pea, crotalaria, velvet bean, millet + pigeon pea, millet + crotalaria, and millet + velvet bean) and one plot was left fallow. The subplots were represented by phosphorus rates applied as monoammonium phosphate (0, 60 and 90 kg ha-1 P2O5). In August 2011, the soil chemical properties were evaluated (pH, organic matter, phosphorus, potential acidity, cation exchange capacity, and base saturation) as well as biological variables (carbon of released CO2, microbial carbon, metabolic quotient and microbial quotient). After two years of cover crops in rotation with common bean, the cover crop biomass had not altered the soil chemical properties and barely influenced the microbial activity. The biomass production of millet and crotalaria (monoculture or intercropped) was highest. The biological variables were sensitive and responded to increasing phosphorus rates with increases in microbial carbon and reduction of the metabolic quotient.

Absorção de nutrientes e alterações químicas em Latossolos cultivados com plantas de cobertura em rotação com soja e milho

The effects on soil chemical properties brought about by cover crops vary considerably. This study was conducted to evaluate nutrient uptake by five cover crops used for grain, seed and forage production at different seed densities per hectare, as well as uptake by spontaneous vegetation, and their effect on the chemical properties of two Oxisols when grown in rotation with soybean and corn. The experiments were set up in Votuporanga, SP, Brazil and Selvíria, MS, Brazil in March 2008 after conventional soil tillage. A randomized complete block experimental design was used with four replications with the following cover crops at different seed densities: Sorghum bicolor at 6, 7 and 8 kg ha-1; Pennisetum americanum at 10, 15 and 20 kg ha-1; Sorghum sudanense at 12, 15 and 18 kg ha-1; hybrid of Sorghum bicolor with Sorghum sudanense at 8, 9 and 10 kg ha-1; and Urochloa ruziziensis at 8, 12 and 16 kg ha-1. We also used a spontaneous vegetation control. After management of the cover crops, in the first year of study, soybean was sown in no-tillage system and, in the second year, corn was sown, also in a no-tillage system. We evaluated the dry matter yield of different cover crops, nutrient uptake by the cover crops, and the chemical changes in the soil. It was found that in clayey soils with high aluminum content, as in Selvíria, sudan grass at a seed density of 18 kg ha-1, and sorghum at a seed density of 6 kg ha-1, in combination with liming, contributed to reduction of aluminum content and high potential acidity and an increase in base saturation. The different seed densities of each cover crop did not affect the dry matter yield of the cover crop itself, but affected nitrogen uptake of the hybrid Sorghum bicolor with Sorghum sudanense at a seed density of 10 kg ha-1, with lower uptake than at a seed density of 8 kg ha-1. Seed density also affected the organic matter content in the soil with sudan grass, with the seed density of 15 kg ha-1 providing more organic matter content than a seed density of 18 kg ha-1.