|
|
|
| Registros recuperados: 232 | |
|
|
| Gama-Rodrigues,Antonio Carlos da; Barros,Nairam Félix de; Comerford,Nicholas Brian. |
| The objective of this paper is to study selected components of the nutrient cycle of pure and mixed stands of native forest species of Atlantic Forest in southeastern Brazil. Tree diameter, height, above-ground biomass, and nutrient content were determined in 22-year-old stands. Litterfall, litter decomposition, and nutrient concentration were evaluated from August 1994 to July 1995. The following species were studied: Peltogyne angustiflora, Centrolobium robustum, Arapatiella psilophylla, Sclerolobium chrysophyllum, Cordia trichotoma, Macrolobium latifolium. The litter of a natural forest and a 40-year-old naturally regenerated second-growth forest was sampled as well. The mixed-species outmatched pure stands in height, stem volume and total biomass (29.4... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tropical forests; Forest litter; Soil fertility. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000200011 |
| |
|
|
| Yada,Marcela Midori; Melo,Wanderley José de; Mingotte,Fábio Luiz Checchio; Melo,Valéria Peruca de; Melo,Gabriel Maurício Peruca de. |
| ABSTRACT The large production of sewage sludge (SS), especially in large urban centers, has led to the suggestion of using this waste as fertilizer in agriculture. The economic viability of this action is great and contributes to improve the environment by cycling the nutrients present in this waste, including high contents of organic matter and plant nutrients. This study evaluated the chemical and biochemical properties of Dystrophic and EutroferricLatossolos Vermelhos (Oxisols) under corn and after SS application at different rates for 16 years. The field experiment was carried out in Jaboticabal, São Paulo State, Brazil, using a randomized block design with four treatments and five replications. Treatments consisted of control - T1 (mineral... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Enzymatic activity; Soil basal respiration; Microbial biomass; Urban waste. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501303 |
| |
|
|
| Carvalho,Perla Silva Matos de; Franco,Laís Barreto; Silva,Samuel de Assis; Sodré,George Andrade; Queiroz,Daniel Marçal de; Lima,Julião Soares de Souza. |
| ABSTRACT: The use of management zones has ensured yield success for numerous agricultural crops. In spite of this potential, studies applying precision agricultural techniques to cacao plantations are scarce or almost nonexistent. The aim of the present study was to delineate management zones for cacao crop, create maps combining soil physical properties and cacao tree yield, and identify what combinations best fit within the soil chemical properties. The study was conducted in 2014 on a cacao plantation in a Nitossolo Háplico Eutrófico (Rhodic Paleudult) in Bahia, Brazil. Soil samples were collected in a regular sampling grid with 120 sampling points in the 0.00-0.20 m soil layer, and pH(H2O), P, K+, Ca2+, Mg2+, Na+, H+Al, Fe, Zn, Cu, Mn, SB, V, TOC,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Unsupervised classification; Soil fertility. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100312 |
| |
|
| |
|
|
| Dalchiavon,Flávio Carlos; Carvalho,Morel de Passos e; Montanari,Rafael; Andreotti,Marcelo. |
| It is well-known nowadays that soil variability can influence crop yields. Therefore, to determine specific areas of soil management, we studied the Pearson and spatial correlations of rice grain yield with organic matter content and pH of an Oxisol (Typic Acrustox) under no- tillage, in the 2009/10 growing season, in Selvíria, State of Mato Grosso do Sul, in the Brazilian Cerrado (longitude 51º24' 21'' W, latitude 20º20' 56'' S). The upland rice cultivar IAC 202 was used as test plant. A geostatistical grid was installed for soil and plant data collection, with 120 sampling points in an area of 3.0 ha with a homogeneous slope of 0.055 m m-1. The properties rice grain yield and organic matter content, pH and potential acidity and aluminum content were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Soil fertility; Geostatistics; Spatial variability; Oryza sativa. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000100005 |
| |
|
| |
|
| |
|
|
| Rigo,Amanda Zolet; Corrêa,Juliano Corulli; Mafra,Álvaro Luiz; Hentz,Paulo; Grohskopf,Marco André; Gatiboni,Luciano Colpo; Bedendo,Gizelle. |
| ABSTRACT Use of organic fertilizers in integrated crop-livestock (iCL) systems may affect soil phosphorus fractions. This study aimed to determine phosphorus fractions in the soil under the iCL system after six years of application of organic or mineral fertilizers. The experiment was conducted on a Rhodic Kandiudox (Nitossolo Vermelho Distroférrico) in a randomized block design, using a 5 × 3 + 1 factorial scheme, with four replicates. The treatments consisted of three organic fertilizers (poultry litter, pig slurry, and compost) and two mineral fertilizers (M1, equivalent to pig slurry; and M2, equivalent to poultry litter) in interaction with three application rates, corresponding to 75, 100, and 150 % of the fertilizer recommendation for the crop of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manure; P fractionation; P sorption; Soil fertility. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100508 |
| |
|
|
| Jacomino,Vanusa Maria Feliciano; Oliveira,Kerley Alberto Pereira de; Taddei,Maria Helena Tirollo; Siqueira,Maria Célia; Carneiro,Maria Eleonora Deschamps Pires; Nascimento,Marcos Roberto Lopes; Silva,David Faria da; Mello,Jaime Wilson Vargas de. |
| Phosphogysum (PG) or agricultural gypsum, a solid waste from the phosphate fertilizer industry, is used as soil amendment, especially on soils in the Cerrado region, in Brazil. This material may however contain natural radionuclides and metals which can be transferred to soils, plants and water sources. This paper presents and discusses the results of physical and chemical analyses that characterized samples of PG and compares them to the results found in two typical soils of the Cerrado, a clayey and sandy one. These analyses included: solid waste classification, evaluation of organic matter content and of P, K, Ca, Mg, and Al concentrations and of the mineralogical composition. Natural radionuclides and metal concentrations in PG and soil samples were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphogysum; Soil fertility; Radionuclides; Metals; Contamination. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500038 |
| |
|
|
| Sixel,Ricardo Michael de Melo; Arthur Junior,José Carlos; Gonçalves,José Leonardo de Moraes; Alvares,Clayton Alcarde; Andrade,Gabriel Ramatis Pugliese; Azevedo,Antonio Carlos; Stahl,James; Moreira,Antônio Maurício. |
| ABSTRACT The impact of intensive management practices on the sustainability of forest production depends on maintenance of soil fertility. The contribution of forest residues and nutrient cycling in this process is critical. A 16-year-old stand of Pinus taeda in a Cambissolo Húmico Alumínico léptico (Humic Endo-lithic Dystrudept) in the south of Brazil was studied. A total of 10 trees were sampled distributed in five diameter classes according to diameter at breast height. The biomass of the needles, twigs, bark, wood, and roots was measured for each tree. In addition to plant biomass, accumulated plant litter was sampled, and soil samples were taken at three increments based on sampling depth: 0.00-0.20, 0.20-0.40, 0.40-0.60, 0.60-1.00, 1.00-1.40,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Nutrient cycling; Forest management. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501416 |
| |
|
|
| Garcia,Cira Hortensia Pérez; Lima,Hedinaldo Narciso; Silva,Francisco Weliton Rocha; Neves Junior,Afrânio Ferreira; Teixeira,Wenceslau Geraldes; Macedo,Rodrigo Santana; Tavares,Sérgio Guimarães. |
| Large areas of Plinthosols with ferruginous materials such as plinthite and/or petroplinthite are fairly common in the Brazilian Amazon basin. This work was carried out to investigate the chemical behavior, mineralogical composition and weathering stage of four representative soil profiles with plinthite and petroplinthite, in Iranduba, AM (Central Amazon). Three well-drained soil profiles at high elevations were studied (P1, Plinthic Vetic Ferralsol; P2 and P3, Vetic Endopetric Plinthosol) and a contrasting poorly drained soil (P4 Haplic Plinthosol), located at low elevation. After profile descriptions, soil samples were collected from each horizon, air-dried, sieved (2 mm), and analyzed for particle-size distribution, pH, exchangeable cations (Al3+,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plinthosol; Soil fertility; XRD; Weathering degree; Central Amazon. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400011 |
| |
|
|
| Vieira,Sidney Rosa; Guedes Filho,Osvaldo; Chiba,Márcio Koiti; Cantarella,Heitor. |
| Assessing the spatial variability of soil chemical properties has become an important aspect of soil management strategies with a view to higher crop yields with minimal environmental degradation. This study was carried out at the Centro Experimental of the Instituto Agronomico, in Campinas, São Paulo, Brazil. The aim was to characterize the spatial variability of chemical properties of a Rhodic Hapludox on a recently bulldozer-cleaned area after over 30 years of coffee cultivation. Soil samples were collected in a 20 x 20 m grid with 36 sampling points across a 1 ha area in the layers 0.0-0.2 and 0.2-0.4 m to measure the following chemical properties: pH, organic matter, K+, P, Ca2+, Mg2+, potential acidity, NH4-N, and NO3-N. Descriptive statistics were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Soil fertility; Traditional management; Semivariogram. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500041 |
| |
|
|
| Bezerra,Marcio G. da S.; Silva,Gualter G. C. da; Difante,Gelson dos S.; Emerenciano Neto,João V.; Oliveira,Ermelinda M. M.; Morais,Éric G.. |
| ABSTRACT There is a worldwide concern regarding the management of agroindustrial residues, involving sustainable practices that contribute to taking advantage of the residues as inputs in productive processes, allowing greater efficiency in the integration of agricultural activities and mitigating their adverse effects on the soil. Therefore, the objective of this study was to assess the effects of application of cassava wastewater on the chemical attributes of the soil cultivated with Brachiaria brizantha cv. Marandu. The experimental design was in randomized blocks with five treatments (0, 15, 30, 60 and 120 m³ ha-1 of cassava wastewater) and four repetitions. To characterize soil chemical attributes soil samples were collected at depths 0 to 10 and 10... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biofertilizer; Macronutrients; ‘manipueira’; Soil fertility. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000800579 |
| |
|
|
| Maia,Celsemy E.; Morais,Elis R. C. de. |
| ABSTRACTThis study aimed to estimate the critical levels for soil chemical attributes through the criterion of reduced continuous probability distribution (NCRIz) in areas under irrigated banana cultivation and evaluate soil fertility of low-yield areas in the Apodi Plateau. A dataset composed of analysis of 60 producing areas and their respective yields was used. It was concluded that the method can be used to obtain critical levels for soil chemical attributes and the critical levels obtained for the irrigated areas under banana cultivation corresponded to 7.2 for pH, 0.91 g kg-1 for N, 0.31, 6.34, 2.63, 1.42 and 25.76 mg kg-1 for Cu, Fe, Mn, Zn and P, respectively, and 6.43, 1.14, 0.24 and 0.36 cmolc kg-1 for Ca, Mg, Na and K, respectively. In the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Modelling; Musa spp.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001000926 |
| |
|
|
| Carvalho,Maria da C. S.; Nascente,Adriano S.; Ferreira,Gilvan B.; Mutadiua,Celso A. P.; Denardin,José E.. |
| ABSTRACT There is little information about common bean fertilization in African Savannas. The objectives of this study were as follows: i) to evaluate the common bean yield potential in the environmental conditions of Lichinga, Niassa, Mozambique, and ii) to determine the common bean response to phosphorus and potassium fertilization applied together in order to verify whether the interpretation of soil analysis for the Brazilian Cerrado could be adopted for Savanna soils in Mozambique. The experimental design was a randomized block design in a 5 x 4 x 2 factorial arrangement. Treatments consisted of a combination of phosphorus doses (0, 35, 70, 140 and 280 kg ha-1 of P2O5), potassium doses (0, 50 100 and 200 kg ha-1 of K2O), and different growing seasons... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Yield components; Soil fertility. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000500308 |
| |
|
|
| Bernardi,Alberto C. de C.; Grego,Célia R.; Andrade,Ricardo G.; Rabello,Ladislau M.; Inamasu,Ricardo Y.. |
| ABSTRACT The knowledge of soil property spatial variability is useful for determining the rational use of inputs, such as the site-specific application of lime and fertilizer. The objective of this study was to evaluate the vegetation index and spatial variability of physical and chemical soil properties in an integrated crop-livestock system (ICLS). Soil samples were taken from a 6.9 ha area in a regular hexagon grid at 0-0.20 m depths. Soil P, K, Ca, Mg, and cation exchange capacity - CEC; base saturation; clay and sand were analyzed. Soil electrical conductivity (ECa) was measured with a contact sensor. The site was evaluated at the end of the corn season (April) and during forage production (October) using Landsat 5 images, remote sensing techniques... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Soil electrical conductivity; VERIS; Landsat 5; NDVI. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000800513 |
| |
|
|
| Silva,Leda V. B. D.; Lima,Vera L. A. de; Pearson,Howard W.; Silva,Tainara T. S.; Cris L. Maciel,S.; Sofiatti,Valdinei. |
| ABSTRACT The objective of this research was to investigate the effects of irrigation with treated wastewater and nitrogen (N) fertilization on the chemical characteristics of a Haplustalf soil cultivated with cotton. An experiment was conducted in a greenhouse in a completely randomized design with four replicates, and arranged in a 5 x 4 factorial. Five doses of N fertilization (0, 45, 90, 135 and 180 kg ha-1) and four sources of irrigation water (freshwater, wastewater treated by an anaerobic reactor, wastewater treated by an anaerobic reactor and post-treated by intermittent sand filter in series, wastewater treated in a septic tank and post-treated by an intermittent sand filter) were tested. Irrigation was daily performed from July 2011 to January... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reuse; Soil fertility; Irrigation. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000400308 |
| |
|
|
| Carneiro,Marcio Alves; Lima,Augusto Miguel Nascimento; Cavalcante,Ítalo Herbert Lucena; Sousa,Karla dos Santos Melo de; Oldoni,Fernanda Campos Alencar; Barbosa,Karine da Silva. |
| Abstract Correct management of potassium (K) fertilization is of fundamental importance for mango orchards, and K is one of the most exported and yield-limiting nutrients. Thus, an experiment was carried out to evaluate the production and physical-chemical characteristics of Tommy Atkins mango fruits under fertigation with different doses of potassium chloride and potassium sulfate in the semi-arid region. The experimental design was randomized blocks in split plots, using five K doses (50, 75, 100, 125 and 150% of the recommended dose) in the plots and two sources of K (potassium chloride – KCl and potassium sulfate – K2SO4) in the subplots, with four replicates. The following characteristics were evaluated: transverse and longitudinal diameters, skin... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mangifera indica L.; Soil fertility; Physical-chemical characteristics. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000503002 |
| |
|
|
| Delonzek,Edina Costa; Botelho,Renato Vasconcelos; Muller,Marcelo Marques Lopes; Maciel,Cleber Daniel de Goes; Maia,Aline José. |
| Abstract Soil management is a practice that influences the development of fruit trees. In this sense, the objective of this study was to evaluate the effect of different soil cover/mulching types on weed control and on the early development of pear trees Hosui cultvar. The experiment was conducted in two consecutive cycles: 2015/2016 and 2016/2017. Treatments consisted of the following soil covers in pear tree planting rows: natural cover, ryegrass straw intercropped with millet, pine sawdust, shading cover (70%), rice husk, Curauá fiber and weeding. Soil infestation by weeds was evaluated in the spring-summer period for two years, as well as the vegetative pear tree development (plant height and diameter and SPAD chlorophyll index). Managements using... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pyrus spp.; Spontaneous plants; Agroecology; Soil fertility; Sustainability. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000200702 |
| |
|
| |
| Registros recuperados: 232 | |
|
|
|
