M. C. M. Macedo

Physical quality of an Oxisol under an integrated crop-livestock-forest system in the Brazilian Cerrado

A qualidade fisica do solo e um importante fator para a sustentabilidade dos sistemas agricolas. O objetivo desta pesquisa foi avaliar as propriedades fisicas do solo e o carbono orgânico em um Latossolo Vermelho distrofico, sob sistema de integracao lavoura-pecuaria-floresta. O experimento foi conduzido no Mato Grosso do Sul, Brasil. Os tratamentos consistiram de sete sistemas: integracao lavoura-pecuaria-floresta, com 357 arvores ha-1 e altura de pastejo de 30 cm (CLF357-30); integracao lavoura-pecuaria-floresta, com 357 arvores ha-1 e altura do pastejo de 45 cm (CLF357-45); integracao lavoura-pecuaria-floresta, com 227 arvores ha-1 e altura do pastejo de 30 cm (CLF227-30); integracao lavoura-pecuaria-floresta, com 227 arvores ha-1 e altura do pastejo de 45 cm (CLF227-45); integracao lavoura-pecuaria, com a altura do pastejo de 30 cm (CL30); integracao lavoura-pecuaria, com a altura do pastejo de 45 cm (CL45); e vegetacao nativa (NV). As propriedades do solo foram avaliadas nas profundidades de 0-10 e 10-20 cm. Todos os tratamentos com pastagem aumentaram a densidade do solo (rb) e resistencia a penetracao (RP) e diminuiram a porosidade total (¦t) e macroporosidade (¦ma), em comparacao com a NV. Os valores de rb (1,18-1,47 Mg m-3), ¦ma (0,14-0,17 m3 m-3) e PR (0,62-0,81 MPa) na profundidade de 0-10 cm nao foram restritivos ao crescimento de plantas. A mudanca de uso do solo a partir NV para CL ou CLF diminuiu o carbono orgânico (SOC) e o estoque de carbono orgânico (SOCpool). Todos os tratamentos com pastagem apresentaram SOCpool similar na profundidade de 0-10 cm e foram menores em comparacao a NV (17,58 Mg ha-1).

Renovação de pastagem degradada com calagem, adubação e leguminosa consorciada em Neossolo Quartzarênico

The degradation is considered to be the major problem of cultivated pastures in the Cerrado. In Quartzipsament, an experiment was conducted to evaluate several degraded pasture recovering treatments of Brachiaria decumbens , introducing Brachiaria brizantha cv. Marandu. The treatments were: Witness; Liming; Liming + P; Liming + ½(PK); Liming + PK. Liming + PK + Micronutrients; Liming + PK + Micronutrients + Legume. The experimental design was that of randomized blocks with four replications. Three cuts in a 325 days period were done and, in the end, the evaluation of roots production and soil chemical analysis. All renovation systems differed from the witness and some of them differed among themselves in terms of dry mass of aerial portion, with emphasis to the legume treatment. The roots production was significantly greater in three treatments when compared to the witness. Significant increases in the nutrient levels and soil pH were verified, in function of lime and fertilization application

Degraded pasture recovering with liming, fertilization, and associated legume in Quartzipsament.

The degradation is considered to be the major problem of cultivated pastures in the Cerrado. In Quartzipsament, an experiment was conducted to evaluate several degraded pasture recovering treatments of Brachiaria decumbens , introducing Brachiaria brizantha cv. Marandu. The treatments were: Witness; Liming; Liming + P; Liming + ½(PK); Liming + PK. Liming + PK + Micronutrients; Liming + PK + Micronutrients + Legume. The experimental design was that of randomized blocks with four replications. Three cuts in a 325 days period were done and, in the end, the evaluation of roots production and soil chemical analysis. All renovation systems differed from the witness and some of them differed among themselves in terms of dry mass of aerial portion, with emphasis to the legume treatment. The roots production was significantly greater in three treatments when compared to the witness. Significant increases in the nutrient levels and soil pH were verified, in function of lime and fertilization application

Renovação de pastagem degradada com calagem, adubação e leguminosa consorciada em Neossolo Quartzarênico - DOI: 10.4025/actasciagron.v30i1.1162

The degradation is considered to be the major problem of cultivated pastures in the Cerrado. In Quartzipsament, an experiment was conducted to evaluate several degraded pasture recovering treatments of Brachiaria decumbens , introducing Brachiaria brizantha cv. Marandu. The treatments were: Witness; Liming; Liming + P; Liming + ½(PK); Liming + PK. Liming + PK + Micronutrients; Liming + PK + Micronutrients + Legume. The experimental design was that of randomized blocks with four replications. Three cuts in a 325 days period were done and, in the end, the evaluation of roots production and soil chemical analysis. All renovation systems differed from the witness and some of them differed among themselves in terms of dry mass of aerial portion, with emphasis to the legume treatment. The roots production was significantly greater in three treatments when compared to the witness. Significant increases in the nutrient levels and soil pH were verified, in function of lime and fertilization application