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| Registros recuperados: 232 | |
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| Spironello,Ademar; Quaggio,José Antonio; Teixeira,Luiz Antonio Junqueira; Furlani,Pedro Roberto; Sigrist,José Maria Monteiro. |
| There is a lack of information about fertilization of pineapple grown in the State of São Paulo, Brazil. So a field experiment with pineapple 'Smooth Cayenne' was carried out to study the effects of NPK rates on yield and fruit quality. The trial was located on an Alfisol in the central part of the State of São Paulo (Agudos county). The experimental design was an incomplete NPK factorial, with 32 treatments set up in two blocks. The P was applied only at planting, at the rates of 0; 80; 160 and 320 kg/ha of P2 0(5), as superphosphate. The N and K2O rates were 0; 175; 350, and 700 kg/ha, applied as urea and potassium chloride, respectively, divided in four applications during the growth period. Response functions were adjusted to yield or to fruit... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ananas comosus (L.) Merrill; Mineral nutrition; Growth; Soil fertility; Tropics. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000100041 |
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| Balieiro Neto,Geraldo; Reis,Ricardo Andrade; Ruggieri,Ana Cláudia. |
| The objective of this experiment was to evaluate the effects of nitrogen doses (0, 100, 200, 300, and 400 kg ha-1 year-1), with or without dolomitic lime covering application, on the potassium (K) soil content at depths varying form 0 to 5, 5 to 10, and 10 to 20 cm, and the potassium concentration in the plant. The experiment was carried out in a rhodic ferralsol with a slightly rolling relief, in a 5 × 2 factorial arrangement, in a complete randomized block design, with four replications. Nitrogenated fertilization caused a linear increase in the potassium concentration in the plant and also in the mineral content in the 0-5 cm soil layer. An effect of competitive inhibition occurred between the potassium and calcium absorption, and potassium and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mineral nutrition; Soil fertility; Urea; Urochloa. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700002 |
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| Moreira,Adônis; Fageria,Nand Kumar; Souza,Gilberto Batista de; Freitas,Alfredo Ribeiro de. |
| The objective of this work was to evaluate the effects of cattle manure, reactive natural phosphate and biotite schist on the soil fertility, yield and nutritional status of Megathyrsus spp. cv. Massai. The experiment was conducted under field conditions, in a dystrophic Red Yellow Latosol (Oxisol). It was used a randomized block experimental design with the following treatments: three natural reactive rock phosphate from Algeria (Djebel-Onk) doses (0, 100 and 200 kg ha-1 of P2O5), three biotite schist doses (0, 150 and 300 kg ha-1 of K2O) and three cattle manure doses (0, 20 and 40 t ha-1). The application of natural phosphate increased dry matter yield, however, application of cattle manure and biotite schist did not influence this variable. Foliar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternative sources; Megathyrsus spp.; Mineral nutrition; Soil fertility. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000900004 |
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| Lima,Yuri Bezerra de; Sá,Francisco Vanies da Silva; Ferreira Neto,Miguel; Paiva,Emanoela Pereira de; Gheyi,Hans Raj. |
| ABSTRACT Cowpea is widely grown in the Brazilian semiarid region, however, due to excess salts in the soil and irrigation water constantly low crop productivity has been observed. Accumulation of salts in the soil, growth and biomass partition of cowpea under salt stress and phosphorus fertilization was evaluated in this study. The assay was conducted in a greenhouse in Mossoró, State of Rio Grande do Norte, Brazil, from September to December 2015, using a Alfissol Latosolic with low phosphorus content. The experiment was carried out in a randomized block design in a factorial 5 x 3 arrangement, consisting of five water salinity levels (0.5, 1.5, 2.5, 3.5 and 4.5 dS m-1) and three doses of superphosphate (60, 100 and 140% of the recommended dose for crop -... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Soil fertility; Irrigation; Growth analysis; Saturation extract. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500765 |
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| Rosolem,Ciro Antonio; Merlin,Alexandre; Bull,Júlio Cesar Longo. |
| Some plant species can change soil phosphorus (P) availability and this may be an important tool in managing tropical high fixing phosphorus soils. An experiment was conducted to evaluate phosphorus transformations in the soil and phosphatase activity during periods of Congo grass (Brachiaria ruziziensis, Germain et Evrard) growth in two tropical soils receiving 20, 40, 80, 160 mg dm-3 of inorganic P. Plants were grown for 84 days in 8-L pots. Acid phosphatase activity, P in the microbial mass, soil organic and inorganic P and P accumulation by Congo grass were evaluated. Phosphorus fertilization increased soil P availability, Congo grass yields and P accumulation in the plant. On average, less labile P forms in the soil were not changed by Congo grass;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphatase; Soil fertility; Crop rotation; Brachiaria. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400008 |
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| Silva,Isley Cristiellem Bicalho da; Basílio,Josiana Jussara Nazaré; Fernandes,Luiz Arnaldo; Colen,Fernando; Sampaio,Regynaldo Arruda; Frazão,Leidivan Almeida. |
| ABSTRACT: The production of biochar from organic residues promises to be an interesting strategy for the management of organic waste. To assess the effect of biochar on soil properties and the production and nutrition of common bean (Phaseolus vulgaris L.), three simultaneous experiments were conducted in a greenhouse with different biochar from organic residues (rice husk, sawdust, and sorghum silage) used as filtration material for swine biofertilizer. In each experiment the treatments consisted of five different biochar concentrations (0, 25, 50, 75 and 100 L m−3), arranged in a completely randomized design, with four repetitions. In the experiments, the use of biochar increased soil pH, cation exchange capacity, nutrient availability in the soil, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris L.; Agricultural residues; Biochar; Soil fertility. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500378 |
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| Silva,Érica Tomé da; Melo,Wanderley José de; Teixeira,Sandra Tereza. |
| Mining is an activity that tends to degrade the environment. The restoration of mining areas, aims to accelerate and improve the succession process according to its future use. The objective of this work was to rehabilitate a soil degraded by tin mining activities in the Amazon Basin (Jamari National Forest, State of Rondônia) with the application of water treatment sludge (WTS), and verify the effect of sludge on values of pH (CaCl2 0.01 mol L-1), organic matter, P, Ca, Mg, K, H+Al, and soil micronutrient contents when cultivated with native plants, legumes, and grass species. A factorial (3 X 5) experimental design was used to optimize the rehabilitation of these areas including three N rates (100, 200, and 300 mg N kg-1 soil supplied by WTS), five plant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Micronutrient; Tin mining; Soil reclaiming; Residue. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600008 |
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| Moretti,Sarah Mello Leite; Bertoncini,Edna Ivani; Abreu-Junior,Cassio Hamilton. |
| Sewage sludge (SS) has been widely used as organic fertilizer. However, its continuous use can cause imbalances in soil fertility as well as soil-water-plant system contamination. The study aimed to evaluate possible improvements in the chemical and microbiological characteristics of domestic SS, with low heavy metal contents and pathogens, through the composting process. Two composting piles were set up, based on an initial C/N ratio of 30:1, with successive layers of tree pruning waste and SS. The aeration of piles was performed by mechanical turnover when the temperature rose above 65 ºC. The piles were irrigated when the water content was less than 50 %. Composting was conducted for 120 days. Temperature, moisture content, pH, electrical conductivity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosolid; Compost; Pathogen; Soil fertility. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500432 |
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| Bortoletto-Santos,Ricardo; Guimarães,Gelton Geraldo Fernandes; Roncato Junior,Vanderlei; Cruz,Diego Fernandes da; Polito,Wagner Luiz; Ribeiro,Caue. |
| ABSTRACT: Polymer coatings are used to control the rate of release of plant available nutrients from fertilizers as well as to reduce nutrient losses such as ammonia (NH3) volatilization. Although the literature presents several examples of materials used to coat urea, little is known about nitrogen (N) release properties such as the mechanism involved and phenomena (e.g., pore opening) in the polymer coating. Thus, this study investigated urea release from polyurethane (PU) derived from two renewable raw materials (castor oil and soybean oil), to explain how the oil structure and coating microstructure influence release and urea-N dynamics in soil. The results demonstrated that the profile of urea release and the urea-N mineralization in the soil could be... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Polyurethane; Controlled release; Plant nutrition; Soil fertility; Nitrogen. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101402 |
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| Dorneles,Evelyn Penedo; Lisboa,Bruno Brito; Abichequer,André Dabdab; Bissani,Carlos Alberto; Meurer,Egon José; Vargas,Luciano Kayser. |
| Tillage and fertilization methods may affect soil fertility. With the aim of assessing changes in soil chemical properties over a period of ten years, soil samples of a Paleudult were collected over nine seasons at three layer depths (0-5, 5-10, 10-20 cm) and were chemically analyzed. Grain yield and nutrient export in two summer crops, soybean (Glycine max) and corn (Zea mays), in a field experiment set in Eldorado do Sul, in the state of Rio Grande do Sul, Brazil, were determined. Three soil tillage systems were evaluated, conventional (CT), reduced (RT) and no-tillage (NT), combined with mineral (lime and fertilizers) and organic (poultry litter) fertilization. The no-tillage system stood out as compared to the others, especially in the surface layer,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Conventional tillage; No-tillage; Organic matter; Cation exchange capacity. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200175 |
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| Registros recuperados: 232 | |
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