50 results

Soil uses in the sugarcane fallow period to improve chemical and physical properties of two latosols (oxisols)

Carolina Fernandes, José Eduardo Corá, Adolfo Valente Marcelo

01/Feb/2012

Sugarcane production should be integrated with crop diversification with a view to competitive and sustainable results in economic, social and environmental aspects. The purpose of this study was to assess the influence of different soil uses during the sugarcane fallow period on the chemical and physical properties of eutroferric Red Latosol – LVef (Oxisol) and Acric Latosol – LVw (Acric Oxisol), in Jaboticabal, São Paulo State, Brazil (21º14’05” S, 48º17’09” W, 600 m asl). A randomized block design was used […]

Forms of inorganic phosphorus in soil under different long term soil tillage systems and winter crops

Tales Tiecher, Danilo Rheinheimer dos Santos, João Kaminski, Ademir Calegari

01/Feb/2012

The cultivation of crops with different capacity of P uptake and use under long-term soil tillage systems can affect the distribution of P cycling and inorganic forms in the soil, as a result of higher or lower use efficiency of P applied in fertilizers. The purpose of this study was to evaluate the effect of long-term cultivation of different winter species under tillage systems on the distribution of inorganic P forms in the soil. In 1986, the experiment was initiated […]

Management systems and the carbon and nitrogen stocks of cerrado oxisol under soybean-maize succession

Rafael de Souza Nunes, André Alves de Castro Lopes, Djalma Martinhão Gomes de Sousa, Ieda de Carvalho Mendes

01/Aug/2011

Carbon and N stocks in soils are determined by the balance between addition and losses, and tillage and cropping systems are decisive in this process. This study aimed to evaluate the effect of soil management systems based on tillage, cover crops and P fertilization on C and N stocks in physical fractions of the soil organic matter and on microbial biomass and respiration in a soil after 11 years under soybean-maize rotation. The experiment was initiated in 1999 in an […]

Effect of 15n-labeled hairy vetch and nitrogen fertilization on maize nutrition and yield under no-tillage

José Alan de Almeida Acosta, Telmo Jorge Carneiro Amado, Andreas de Neergaard, Mads Vinther, Leandro Souza da Silva, Rodrigo da Silveira Nicoloso

01/Aug/2011

This study evaluated the effect of hairy vetch (Vicia villosa Roth) as cover crop on maize nutrition and yield under no tillage using isotope techniques. For this purpose, three experiments were carried out: 1) quantification of biological nitrogen fixation (BNF) in hairy vetch; 2) estimation of the N release rate from hairy vetch residues on the soil surface; 3) quantification of 15N recovery by maize from labeled hairy vetch under three rates of mineral N fertilization. This two-year field experiment […]

Least limiting water range in soil under crop rotations and chiseling

Juliano Carlos Calonego, Ciro Antonio Rosolem

01/Jun/2011

Soil water availability to plants is affected by soil compaction and other variables. The Least Limiting Water Range (LLWR) comprises soil physical variables affecting root growth and soil water availability, and can be managed by either mechanical or biological methods. There is evidence that effects of crop rotations could last longer than chiseling, so the objective of this study was to assess the effect of soil chiseling or growing cover crops under no-till (NT) on the LLWR. Crop rotations involving […]

Triticale, pearl millet and phosphates for no-till straw production

José Antonio de Fátima Esteves, Ciro Antonio Rosolem

01/Jun/2011

Water soluble phosphates are the most often used phosphorus sources in fertilizers for ease of P release to the soil. However, in tropical soils, much of this P is adsorbed to soil particles and becomes unavailable to plants. Conversely, reactive phosphates may be slow initial releasers of the nutrient, but be released continually to the developing crops, reducing soil P fixation. The aim of this study was to investigate the application of two P sources to triticale and assess the […]

Agronomic aspects of leguminous to green fertilization in the Cerrado of the High Jequitinhonha Valley

Ricardo Borges Teodoro, Fábio Luiz de Oliveira, Diego Mathias Natal da Silva, Claudenir Fávero, Mateus Augusto Lima Quaresma

01/Apr/2011

The intensive and inadequate use of soils accelerates its degradation, requiring the intervention by means of conservation practices to restore the productive capacity of the same. The aim of this study was to evaluate the behavior and development of different legumes used as green manure in soils of the Cerrado, High Jequitinhonha Valley in Turmalina, MG. The experimental design was in randomized blocks with seven treatments and four replications, the treatments were the leguminous: Mucuna nivea, Mucuna aterrima, Dolichos lablab, […]

Physical quality of an Oxisol under management systems evaluated by the Index “S”

Fabiana de Souza Pereira, Itamar Andrioli, Faber de Souza Pereira, Paula Regina de Oliveira, José Frederico Centurion, Ricardo Jorge Falqueto, [...]

01/Feb/2011

The monitoring of soil quality based on physical properties is important for the evaluation and maintenance of the sustainability of agricultural systems. An indicator property of soil quality should be sensitive to management changes. This study aimed to evaluate the S parameter as an indicator of soil physical quality and aggregation of an Oxisol, managed for 11 years in systems with and without the inclusion of off-season cover crops. The treatments consisted of: conventional system (SC) and conservation systems with […]

Nitrogen washing from C3 and C4 cover grasses residues by rain

Ciro Antonio Rosolem, Rodrigo Werle, Rodrigo Arroyo Garcia

01/Dec/2010

Crop species with the C4 photosynthetic pathway are more efficient in assimilating N than C3 plants, which results in different N amounts prone to be washed from its straw by rain water. Such differences may affect N recycling in agricultural systems where these species are grown as cover crops. In this experiment, phytomass production and N leaching from the straw of grasses with different photosynthetic pathways were studied in response to N application. Pearl millet (Pennisetum glaucum) and congo grass […]

Physical properties of a typic paleudalf under long-term no-tillage and cropping systems

Mastrângello Enívar Lanzanova, Flávio Luiz Foletto Eltz, Rodrigo da Silveira Nicoloso, Telmo Jorge Carneiro Amado, Dalvan José Reinert, Marta Rodrigues da Rocha

01/Aug/2010

No-tillage associated to cover crops may maintain soil quality, improving or preserving favorable soil physical conditions for plant growth. This study assessed soil bulk density, porosity, penetration resistance, and water infiltration of a PALEUDALF, in the Experimental Area of the Soil Science Department of the Federal University of Santa Maria, in Santa Maria, RS, Brazil, in an experiment started in 1991, with the following crop successions and rotations: (1) Corn/Soybean – Jackbean – MFP; (2) Bare soil – SDES; (3) […]

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