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| Registros recuperados: 88 | |
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| Van Langenhove, Leandro; Verryckt, Lore T.; Bréchet, Laëtitia; Courtois, Elodie A.; Stahl, Clement; Hofhansl, Florian; Bauters, Marijn; Sardans, Jordi; Boeckx, Pascal; Fransen, Erik; Peñuelas, Josep; Janssens, Ivan A.. |
| Atmospheric deposition is an important component of the nutrient cycles of terrestrial ecosystems, but field measurements are especially scarce in tropical regions. In this study we analysed 15 months of precipitation chemistry collected in an old growth tropical forest located in French Guiana. We measured nutrient inputs via bulk precipitation and throughfall and used the canopy budget model to estimate nutrient fluxes via canopy exchange and dry deposition. Based on this method we quantified net fluxes of macronutrients and compared their contribution to internal cycling rates via litterfall. Our results suggest that while atmospheric deposition of nitrogen was relatively high (13 kg ha−1 year−1), and mainly in organic forms, the N inputs via litterfall... |
| Tipo: Text |
Palavras-chave: Throughfall; Litterfall; Nutrient cycling; Nitrogen; Phosphorus; Potassium. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74123/73572.pdf |
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| Carmona,Felipe de Campos; Anghinoni,Ibanor; Holzschuh,Marquel Jonas; Martins,Amanda Posselt. |
| Soils of the coastal plains of Rio Grande do Sul, Brazil, are affected by salinization, which can hamper the establishment and development of crops in general, including rice. The application of high doses of KCl may aggravate the crop damage, due to the high saline content of this fertilizer. This study aimed to evaluate the effect of K fertilizer management on some properties of rice plant, grown in soils with different sodicity levels, and determine which attribute is best related to yield. The field study was conducted in four Albaqualfs with exchangeable Na percentages of 5.6, 9.0, 21 and 32 %. The management of KCl fertilizer consisted of the application of 90 kg ha-1 K2O broadcast, 90 kg ha-1 K2O in the row and 45 kg ha-1 K2O in the row + 45 kg ha-1... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sodium; Potassium; Oryza sativa L.; Density; Spikelet sterility; Grain yield. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300023 |
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| Hirzel,Juan; Walter,Ingrid. |
| Poultry litter (PL) is an organic matter source used as soil amendment. Besides its important nutrient content, it is a cheap alternative to conventional fertilizers in crop production. The efficient use of PL also helps reduce the environmental problems normally associated with its disposal near poultry production farms. This article reports the relative effects of PL and conventional fertilizers on the availability of soil N, P and K, dry matter (DM) production and total nutrient content in silage corn (Zea mays L.). The field experiment was carried out in a soil derived from volcanic ash (Tipic Melanoxerands) of Central South Chile. Corn was grown for three seasons (2002-2005) and PL and conventional fertilizers were applied in the first two years. The... |
| Tipo: Journal article |
Palavras-chave: Poultry litter; Soil fertility; Corn; Nitrogen; Phosphorus; Potassium. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300006 |
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| Silva, Ricardo Carlos Pereira da; Oliveira, Francisco de Assis de; Oliveira, Ademar Pereira de; Medeiros, José Francismar de; Alves, Rita de Cássia; Paiva, Francisco Italo Gomes. |
| Bell peppers are sensitive to salinity; therefore, it is necessary to find alternatives to reduce saline stress. An experiment was conducted in a greenhouse at Federal Rural University of the Semi-Arid Region, in Mossoró, Rio Grande do Norte State, Brazil, to evaluate the effects of salinity and K+/Ca2+ ratios on bell pepper production. The experimental design consisted of randomized blocks in a 5 x 4 factorial scheme with four replicates, corresponding to five K+/Ca2+ ratios (F1 = 3.3/1, F2 = 2.8/1, F3 = 2.2/1, F4 = 1.8/1, and F5 = 1.5/1) and four salinity levels in the nutrient solution using NaCl (1.75, 3.25, 4.75, and 6.25 dS m-1). The following parameters were evaluated: the number of fruits (total, marketable and unmarketable), the mean weight of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum L.; Salinity; Potassium; Calcium; Soilless culture. Capsicum annuum L.; Salinity; Potassium; Calcium; Soilless culture.. |
| Ano: 2020 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42498 |
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| Silva,Valéria N. da; Silva,Luiz E. de S. F. da; Silva,Apolino J. N. da; Macedo,Gorete R. de. |
| ABSTRACT The study was conducted in a greenhouse at the Agricultural Research Corporation of Rio Grande do Norte (EMPARN), in order to evaluate the effect of biofertilizers and potassium phosphate rocks, triple superphosphate (TSP) and potassium chloride (KCl), crushed rocks on the chemical properties of the soil and performance of the bacteria Paenibacillus polymyxa in the absorption of macronutrients by the cowpea bean crop. An Ultisol (10 kg per pot) was used with the addition of biofertilizers at levels 40, 70, 100 and 200% of recommendation for TSP and KCl, inoculated or not with bacteria. There was an effect of fertilization on the absorption of macronutrients, being the best results for P and K with TSP + KCL, and N, Ca and Mg for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PRPG; Rock powder; Phosphorus; Potassium. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001201136 |
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| Carmona,Felipe de Campos; Anghinoni,Ibanor; Holzschuh,Marquel Jonas; Andrighetti,Marcelo Hoerbe. |
| Salinity levels in soils of the Outer Coastal Plain of Rio Grande do Sul, Brazil, can be high, due to excess of Na in the irrigation water, evapotranspiration and soil development from marine sediments. The cultivation of irrigated rice could be an alternative, since ion uptake as well as leaching by the establishment of a water layer could mitigate the effects of soil salinity. This study aimed to evaluate the dynamics of basic cations in the solution of Albaqualf soils with different salinity levels growing irrigated rice. The plow layer contained exchangeable Na percentages (ESP) of 5.6, 9.0, 21.2 and 32.7 %. The plant stand, dry matter, Na, K and Ca + Mg uptake at full flowering and grain yield were evaluated. The levels of Na, K, Ca + Mg and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Exchangeable sodium percentage; Potassium; Calcium; Magnesium; Electrical conductivity. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600009 |
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| Giovaninni,L.H.; Kogika,M.M.; Lustoza,M.D.; Kanayama,K.K.; Reche Júnior,A.. |
| Values of sodium, ionized calcium, potassium and chloride obtained by ion-selective electrode method, from serum and blood samples of healthy cats, were compared. Serum ionized calcium value was lower (5.2mg/dl) than blood ionized calcium (5.4mg/dl), and serum potassium (4.47mmol/l) and serum chloride (117.2mmol/l) values were higher than blood potassium (3.94mmol/l) and blood chloride (115mmol/l). |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cat; Calcium; Chloride; Sodium; Potassium. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352007000300040 |
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| Nóbrega, Giovanna Henriques da; UFCG; Silva, Aderbal Marcos de Azevêdo; UFCG; Pereira Filho, José Morais; UFCG; Azevedo, Solange Absalão; UFCG; Silva, Guilherme de Lira Sobral; UFCG; Alcalde, Claudete Regina; UEM. |
| Este trabalho teve como objetivo estimar a composição corporal e exigências nutricionais em macrominerais para ganho de peso de cabritos ½ Boer ½ SRD, na fase de crescimento, em pastejo na região semiárida. O experimento foi desenvolvido na fazenda ‘Nupeárido’, no município de Patos, Estado da Paraíba. Foram utilizados 24 cabritos com peso corporal médio inicial de 15 kg, em pastejo, distribuídos em quatro tratamentos com níveis crescentes de suplementação concentrada (0; 0,5; 1,0 e 1,5% do peso corporal). Os animais, mantidos em sistema de semiconfinamento, receberam suplementação alimentar, em baias individuais, ao serem recolhidos diariamente. Quando um dos animais de cada grupo atingia 30 kg de peso corporal, todos os demais... |
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Palavras-chave: 5.04.00.00-2 Zootecnia cabritos; Cálcio; Fósforo; Potássio; Sódio; Semiárido Exigências Nutricionais dos Animais kid goats; Calcium; Phosphorus; Potassium; Sodium; Semi-arid. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4797 |
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| Mendonça,A.C.; Carneiro,E.M.; Bosqueiro,J.R.; Crepaldi-Alves,S.C.; Boschero,A.C.. |
| We studied the development of the insulin secretion mechanism in the pancreas of fetal (19- and 21-day-old), neonatal (3-day-old), and adult (90-day-old) rats in response to stimulation with 8.3 or 16.7 mM glucose, 30 mM K+, 5 mM theophylline (Theo) and 200 µM carbamylcholine (Cch). No effect of glucose or high K+ was observed on the pancreas from 19-day-old fetuses, whereas Theo and Cch significantly increased insulin secretion at this age (82 and 127% above basal levels, respectively). High K+ also failed to alter the insulin secretion in the pancreas from 21-day-old fetuses, whereas 8.3 mM and 16.7 mM glucose significantly stimulated insulin release by 41 and 54% above basal levels, respectively. Similar results were obtained with Theo and Cch. A more... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rat islet cell; Glucose; Pancreatic islets; Carbamylcholine; Theophylline; Potassium; Insulin secretion. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000600018 |
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| Oliveira,JE; Albino,LFT; Rostagno,HS; Páez,LE; Carvalho,DCO. |
| Three experiments were conducted to determine the nutritional requirements of potassium (K) for male Ross broiler chickens, from 8 to 21, 22 to 42 and 43 to 53 days of age. The following parameters were evaluated: body weight gain (BWG), feed intake (FI) and feed conversion ratio (FCR). In each experiment, a completely randomized experimental design was used, with six treatments (K levels), and six, eight and eight numbers of replicates, and eight, five and four birds per pen, respectively. The experimental diets were basal diets deficient in K but supplemented with K carbonate to result in levels of 0.30, 0.44, 0.58, 0.72, 0.86 and 1.00% K. Estimated requirements for BWG were 0.628, 0.714 and 0.798% K, for the periods 8-21, 22-42 and 43-53 d, respectively. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broiler chickens; Ion; Mineral; Potassium; Requirement; Weight gain. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000100006 |
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| Registros recuperados: 88 | |
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