Mancin C.R.,Agencia de Desenvolvimento Agrario e Extensao Rural |
De Souza L.C.F.,Federal University of Grande Dourados |
Vitorino A.C.T.,Federal University of Grande Dourados |
Pereira S.B.,Federal University of Viçosa |
Da Silva F.P.M.,Agencia de Desenvolvimento Agrario e Extensao Rural
Semina:Ciencias Agrarias | Year: 2013
Soils of the Cerrado have chemical, physical, and biological limitations for agriculture, which, associated with climate factors, contribute to their impoverishment. The maintenance and accumulation of soil organic matter are considered the best option of addressing this problem and to ensure a sustainable production. The purpose of this study was to evaluate different fractions of organic matter, and carbon and nitrogen contained in these compartments of a very clayey dystroferric Red Latossol under different crop rotations and at different depths under long-term no-tillage in Dourados, state of Mato Grosso do Sul. The experiment was arranged in a randomized block design with three replications, and the treatments in a 5x4 factorial design, with five crop rotation systems (1 -vetch + oat + oilseed radish/ soybean/ radish/ maize/ vetch + oats + radish/ soybean; 2 -sunflower/ soybean/ vetch + oat + radish/ maize/ sunflower/ soybean; 3 -oat/ soybean/ sunflower/ maize/ oat/ soybean; 4 -vetch + oat/ soybean/ brachiaria/ maize/ brachiaria/ soybean; 5 -vetch/soybean/vetch/maize/vetch/soybean), in four soil layers (0-5, 5-10, 10-15, 15-20 cm). Particle size was analyzed to determine the particulate fraction of organic matter (POM), and carbon (C-POM) and nitrogen (N-POM) in it. It was concluded that the levels and stock of C-POM, and nitrogen contents in the soil are not influenced by the different crop rotation systems. Crop rotation 4 increased the levels and stock of total organic carbon (TOC), carbon associated with soil minerals (C-MOM) and the total C/N ratio and total C/N ratio associated with soil minerals. The highest levels of TOC, C-POM, C-MOM, total nitrogen, N-POM and nitrogen associated with soil minerals (N-MOM) were found in the 0-5cm layer.
de Araujo L.C.,University of Sao Paulo |
Santos P.M.,Embrapa Pecuaria Sudeste |
Mendonca F.C.,Embrapa Pecuaria Sudeste |
de Barros Lima N.R.C.,Agencia de Desenvolvimento Agrario e Extensao Rural
Revista Brasileira de Zootecnia | Year: 2011
The objective of this work was to evaluate the development and productive traits of palisadegrass single cultivated or intercropped with corn, in addition to corn intercropped with pasture, under water deficit at different development stages of the plants. It was used a complete block experimental design with split plots and three replicates. Periods of water deficit were placed in the plots and types of cultivation were placed in the subplots. Irrigation was stopped at germination and initial tillering of palisadegrass and at V4 and V15 stages of corn and returned when soil moisture was 40% of available water capacity. Tiller density and palisadegrass height were evaluated weekly. Dry matter (DM) of fractions of herbage mass as well as leaf area of the plants were evaluated at corn tasseling and when grains reached physiological maturity. Components of corn production were determined in the second sampling. In palisadegrass, water influenced only tillering, which was reduced in the plots in which water defict was forced at the moment of germination or at the beginning of tilering, in both cultivation systems. Plant height and DM production were affected only by cultivation, reducing when intercropped with corn. Evaluated production components did not influence corn grain productivity, which was similar in all treatments (average of 10,145 kg/ha). Palisadegrass plants produce more DM in single cultivation than intercropped with corn. Water deficit during germination and initial tillering reduces tillering of palisadegrass during establishment phase. Water deficit, applied in this trial, does not reduce DM yield in palisadegrass or corn. © 2011 Sociedade Brasileira de Zootecnia.
Reginato P.,Agencia de Desenvolvimento Agrario e Extensao Rural |
de Souza C.M.A.,Federal University of Grande Dourados |
da Silva C.J.,Embrapa Agropecuaria Oest |
Rafull L.Z.L.,Federal University of Grande Dourados
Pesquisa Agropecuaria Brasileira | Year: 2013
The objective of this work was to evaluate seed quality and agronomic performance of crambe (Crambe abyssinica) at different sowing dates and depths. The cultivar FMS Brilhante was evaluated in four sowing dates (3/26, 4/9, 4/23, and 5/8/2012), at two depths (17.5 and 40.4 mm). Seeding depth influenced stem diameter and plant population, but had no significant effect on yield. Sowing date influences crambe agronomic performance and seed quality, regardless of sowing depth, and the best observed results are from the early April sowing.
Cardoso S.,Agencia de Desenvolvimento Agrario e Extensao Rural |
Volpe E.,Agencia de Desenvolvimento Agrario e Extensao Rural |
Motta Macedo M.C.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária
Pesquisa Agropecuaria Tropical | Year: 2016
Soil acidity and lack of nitrogen fertilization limit the yield of forage grasses. This study aimed at evaluating the effects of lime (0 kg ha-1; 2,000 kg ha-1; 4,000 kg ha-1; and 8,000 kg ha-1) and nitrogen (0 kg ha-1, 20 kg ha-1, 40 kg ha-1, 80 kg ha-1 and 160 kg ha-1) doses on forage accumulation, soil chemical properties and macronutrient concentrations in leaf blades of Massai grass (Panicum maximum cv. Massai). A randomized blocks design in a 4 x 5 factorial scheme, with four replications, was used. Lime and nitrogen doses positively affected the accumulation of green dry mass in the Massai grass as well as the base saturation in the soil. The maximum yield was obtained at nitrogen doses close to 587 kg ha-1 year-1 for nitrogen and 5,796 kg ha-1 for lime, which produced the greatest accumulation of green dry mass (15,267 kg ha-1 year-1) in the first year of assessment. The demand for lime increased from the first to the second year. Lime increased the base saturation, whereas nitrogen reduced it. The nitrogen applied to the soil raised the nitrogen, magnesium and calcium contents (g kg-1) in the leaf blades of Massai grass. Thus, Massai grass reacted positively to nitrogen and lime doses, with significant effects on the accumulation of green dry mass and soil characteristics assessed. © 2016, Universidade Federal De Goias (UFG). All rights reserved.
Figueiredo P.O.,Federal University of Mato Grosso do Sul |
Garcez F.R.,Federal University of Mato Grosso do Sul |
Matos M.D.F.C.,Federal University of Mato Grosso do Sul |
Perdomo R.T.,Federal University of Mato Grosso do Sul |
And 4 more authors.
Planta Medica | Year: 2011
A cytotoxicity-guided fractionation of the roots of Galianthe thalictroides afforded a new -carboline alkaloid, 1-(hydroxymethyl)-3-(2-hydroxypropan-2-yl)- 2-(5-methoxy-9H - carbolin-1-yl)cyclopentanol, which exhibited strong cytotoxic activity against three human cancer cell lines (MCF-7, 786-0, and UACC62). Its structure was established on the basis of 1D- and 2D-NMR spectroscopic techniques supported by HRMS data. © Georg Thieme Verlag KG Stuttgart · New York.