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| Registros recuperados: 98 | |
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| NASCENTE,Adriano Stephan; KROMOCARDI,Ruby. |
| ABSTRACT The upland rice farmers in Suriname use local varieties and low level technologies in the field. As a result, the upland rice grain yield is low, at about 1 000 kg ha-1. Our objective was to evaluate the use of upland rice cultivars from Suriname and Brazil, and the effect of nitrogen, N, phosphorus, P, and potassium, K, fertilizers on cultivation variables. We undertook four field trials in the Victoria Area, in the Brokopondo District, using a randomized block design each with four replications. The most productive rice varieties were BRS Esmeralda (grain yield 2 903 kg ha-1) and BRS Sertaneja (2 802 kg ha-1). The highest grain yield of 2 620 kg ha-1 was achieved with a top dressing application of 76.41 kg N ha-1 20 days after sowing. For P, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa L.; Rice varieties; Nitrogen; Phosphorus; Potassium. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000300185 |
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| Perfeto,Paulo Nelo Medeiros. |
| In Grateloupia doryphora and Gymnogongrus griffithsiae the seasonal variation of their chemical compounds was studied, establishing a relation with the physical and chemical properties of seawater. High values of proteins in the studied species were detected during the winter, 28.88% in G. doryphora and 26.68% in G. griffithsiae, corresponding to the maximum period of ammonium concentration in the marine environment. The variation in carbohydrates content showed an inverse relation with the proteins, with a maximum of 54.72% in G. doryphora and of 55.36% in G. griffithsiae, both in summer, positively correlated with salinity and temperature of sea water. Lipids content was low in both species. In G. doryphora the values ranged between 0.81 and 1.30% and,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae; Proteins; Carbohidrates; Lipids; Ashes; Nitrogen; Phosphorus; Potassium. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061998000100006 |
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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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| Santos, Henrique Pereira dos; EMBRAPA; Fontaneli, Renato Serena; EMBRAPA; Spera, Silvio Tulio; EMBRAPA; Tomm, Gilberto Omar; EMBRAPA. |
| O objetivo deste estudo, empregando o delineamento de blocos casualizados, com quatro repetições, foi avaliar a fertilidade do solo no período de oito anos, num Latossolo Vermelho Distrófico típico, em Coxilha, RS, em seis sistemas de produção de grãos com pastagens anuais de inverno e de verão: I) trigo/soja e pastagem de aveia preta + ervilhaca/milho; II) trigo/soja e pastagem de aveia preta + ervilhaca + azevém/milho; III) trigo/soja e pastagem de aveia preta + ervilhaca/pastagem de milheto; IV) trigo/soja e pastagem de aveia preta + ervilhaca + azevém/pastagem de milheto; V) trigo/soja, aveia branca/soja e pastagem de aveia preta + ervilhaca/pastagem de milheto; e VI) trigo/soja, aveia branca/soja e pastagem de aveia preta + ervilhaca + azevém/pastagem... |
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Palavras-chave: 5.02.01.07-7 Solos Florestais matéria orgânica; Fósforo; Potássio; Integração lavoura-pecuária; Sistemas mistos 5.01.03.00-8 Fitotecnia organic matter; Phosphorus; Potassium; Lay farming; Mixed systems. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/925 |
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| Santos, Max Henrique Vieira dos; Universidade Federal de Alagoas; Araújo, Afranio César de; Universidade Federal de Alagoas]; Santos, Deon Moreno Ribeiro dos; Universidade Federal de Alagoas; Lima, Nadielan da Silva; Universidade Federal de Alagoas; Lima, Cícero Luiz Calazans de; Universidade Federal de Alagoas; Santiago, Antônio Dias; EMBRAPA/CPATC. |
| O presente trabalho foi realizado durante o ano de 2006 na área da Embrapa/UEP/Rio Largo, situada no Campus Delza Gitaí - Unidade Acadêmica Centro de Ciências Agrárias – UFAL, com o objetivo de avaliar a utilização da manipueira - resíduo gerado no processamento da mandioca (Manihot esculenta Crantz) como fonte de potássio na cultura da alface (Lactuca sativa L). O experimento foi conduzido em casa-de-vegetação, em delineamento inteiramente casualizado, com seis tratamentos e seis repetições, sendo os tratamentos: 0, 100, 200, 300, 400 e 500 mL de manipueira por vaso de 5 L. Utilizou-se a cultivar de alface Regina SF 3500, sendo as avaliações realizadas 33 dias após o transplantio. Foram analisadas as características: área foliar, massa fresca das folhas,... |
| Tipo: Pesquisa de campo |
Palavras-chave: 5.00.00.00-4; 5.01.01.06-4; 5.01.03.00-8; Manihot esculenta; Lactuca sativa; Potássio Ciências Agrárias Manihot esculenta; Lactuca sativa; Potassium. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4819 |
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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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| Teles, Thaisa Grazielle Radin Magalhães; Unidade de Ensino Superior Vale do Iguaçu; Carneiro, Maria Socorro de Souza; Universidade Federal do Ceará; Soares, Ismail; Universidade Federal do Ceará; Pereira, Elzania Sales; Universidade Federal do Ceará; Souza, Pedro Zione de; Universidade Federal do Ceará; Magalhães, João Avelar; Embrapa Meio-Norte. |
| O objetivo deste trabalho foi avaliar os efeitos de combinações de doses de nitrogênio, fósforo e potássio sobre a produção de matéria seca e composição química de Brachiaria brizantha cv. MG-4. O experimento foi composto por 16 tratamentos de NPK, conforme matriz experimental Plan Puebla II, distribuídos em delineamento inteiramente casualizado com cinco repetições. Utilizou-se um Argissolo Vermelho-Amarelo Distrófico Arênico e, como fonte de N, P e K, foram utilizados sulfato de amônio e uréia, superfosfato triplo e cloreto de potássio, respectivamente. O material coletado foi separado em colmo e folha, e pré-seco para a determinação da produção matéria seca de folhas (MSF), colmos (MSC) e total (MST), teor de proteína bruta (PB), N, P e K. A adubação... |
| Tipo: Pesquisa de campo |
Palavras-chave: 5.04.00.00-2 Fósforo; Nitrogênio; Potássio; Proteína bruta 5.04.04.00-8 Phosphorus; Nitrogen; Potassium; Crude protein. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/9392 |
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| sorkhi, farshad. |
| In most northwest provinces of Iran such as West Azarbaijan province, soil salinity is a growing problem, particularly in irrigated agricultural areas, and has been found to reduce barley yield, dramatically. To investigate the effect of sodium chloride on two barley (Hordeum vulgare) cultivars, four levels of salinity: 0, 4, 8 and 12 dS/m, were employed as a factorial experiment arranged in a completely randomized design with three replications in a controlled environment of the greenhouse during 2017-2018. The results indicated that increasing salinity from 0 to 12 dS/m, decreased the emergence percentage significantly. Two cultivars of Zarjoo and Valfajr responded differently to salinity, so that Zarjoo showed a significantly higher emergence rate. This... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Emergence; Potassium; Proline; Salinity; Yield components. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5855 |
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| Carović-Stanko,Klaudija; Maloić,Mario; Pintar,Jasna; Liber,Zlatko; Radosavljević,Ivan; Bedeković,Dalibor; Guberac,Sunčica; Očić,Vesna; Lazarević,Boris. |
| Abstract The long tradition of green bean (Phaseolus vulgaris L.) cultivation in Croatia has resulted in the development of a landraces adapted to specific areas and chosen to suit different dietary habits. The hypothesis of our study was that nutritional quality (content of proteins, sugars, fibres, calcium, potassium and phosphorus in fresh pods) of 14 widely grown Croatian green bean accessions is affected by origin and morphotype. The analysed accessions were grown in non-replicated field plots where morphotypes were classified. The gene pool of adscription (Andean vs. Mesoamerican) of each accession was determined with the phaseolin marker, whereas nutritional quality traits were analysed according to standard analytical methods. The relationships... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crude protein; Gene pool; Growth habit; Functional food; Phosphorus; Potassium. |
| Ano: 2018 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952018000400523 |
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| Castañeda-Castro,Odón; Gómez-Merino,Fernando C.; Trejo-Téllez,Libia I.; Pastelín-Solano,Miriam C.. |
| The potential capacity of plant roots to absorb water and nutrients generally declines in osmotic-stressed plants, presumably because of a reduction in the nutrient element demand, and such decrease varies among plant genotypes. In order to investigate the effect of the osmotic stress caused by polyethylene-glycol 6000 (PEG) on the macronutrient concentration in sugarcane (Saccharum spp.) in vitro, we established a factorial experiment with a completely randomized distribution. Study factors were variety (Mex 69-290 and CP 72-2086) and PEG in the nutrient medium (0, 3, 6 and 9 %, to generate osmotic potential corresponding to -0.18, -0.45, -0.65 and -0.80 MPa, respectively), which resulted in eight treatments, with five replicates each. The experimental... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plant nutrition; Poaceae; PEG; Nitrogen; Phosphorus; Potassium. |
| Ano: 2015 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000800004 |
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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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| Rosolem,Ciro Antonio. |
| In this work, a greenhouse experiment was conducted to study the effects of N fertilization and residues of pearl millet, black oats and oilseed radish on pH and Ca, Mg, K, NO3-, and NH4+ distribution within the profile of a Distroferric Red Latosol. The equivalent of 8 t ha-1 of plant residues were placed on soil surface. Lime was applied on the soil surface and nitrogen was applied over the straw at 0, 50, 100, and 150 mg kg-1, as ammonium nitrate. Corn was grown for 57 days. Calcium contents and pH in the soil profile were decreased by Pearl millet residue, while black oat and oilseed radish increased Ca contents and these effects are not related with Ca contents in residue tissue. However, the presence of plant residues increased nitrate, ammonium, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcium; Magnesium; Nitrogen; Potassium; Soil bases; No till. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000300003 |
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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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| Wang,Y.; Mu,J.J.; Geng,L.K.; Wang,D.; Ren,K.Y.; Guo,T.S.; Chu,C.; Xie,B.Q.; Liu,F.Q.; Yuan,Z.Y.. |
| Accumulating evidence has suggested that high salt and potassium might be associated with vascular function. The aim of this study was to investigate the effect of salt intake and potassium supplementation on brachial-ankle pulse wave velocity (PWV) in Chinese subjects. Forty-nine subjects (28-65 years of age) were selected from a rural community of northern China. All subjects were sequentially maintained on a low-salt diet for 7 days (3.0 g/day NaCl), a high-salt diet for an additional 7 days (18.0 g/day NaCl), and a high-salt diet with potassium supplementation for a final 7 days (18.0 g/day NaCl+4.5 g/day KCl). Brachial-ankle PWV was measured at baseline and on the last day of each intervention. Blood pressure levels were significantly increased from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pulse wave velocity; Salt; Potassium; Interventional study. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000100083 |
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| Carreira,R.S.; Facundo,H.T.F.; Kowaltowski,A.J.. |
| Mitochondrial ion transport, oxidative phosphorylation, redox balance, and physical integrity are key factors in tissue survival following potentially damaging conditions such as ischemia/reperfusion. Recent research has demonstrated that pharmacologically activated inner mitochondrial membrane ATP-sensitive K+ channels (mitoK ATP) are strongly cardioprotective under these conditions. Furthermore, mitoK ATP are physiologically activated during ischemic preconditioning, a procedure which protects against ischemic damage. In this review, we discuss mechanisms by which mitoK ATP may be activated during preconditioning and the mitochondrial and cellular consequences of this activation, focusing on end-effects which may promote ischemic protection. These... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mitochondria; Potassium; Calcium; Free radicals; Heart; Ischemia. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000300004 |
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| Leite,Germano L.D; Picanço,Marcelo; Zanuncio,José C; Moreira,Márcio D; Jham,Gulab N. |
| Factors such as fertilization, allelochemicals, trichomes, weather, and natural enemies can influence pest populations. Thus, it is necessary to understand the factors that predispose vegetable species to pests and the role of polyculture, crop rotation, and neighboring plants. The objective of this research was to study the hosting capacity for pests of Abelmoschus esculentus (L.), Brassica oleracea L. vars. acephala and capitata, Capsicum annuum L., Cucurbita moschata (Duchesne), Cucurbita maxima Duchesne and Cucumis sativus L., Lycopersicon esculentum Mill., Solanum gilo Raddi and Solanum melongena L., and Phaseolus vulgaris L. The higher density of Bemisia tabaci (Genn.) adults on C. sativus can be due to the higher amount of pentacosane and octacosane... |
| Tipo: Journal article |
Palavras-chave: Trichomes; Allelochemicals; Nitrogen; Potassium; Insects. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300006 |
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| Sierra B,Carlos; Alfaro P,Rubén. |
| The effects of P and K on grapevines (Vitis vinifera L.) var. Muscat Rosada were evaluated four years, considering the same levels of N. The experiment was conducted at the Vicuña Experimental Station (30° S; 70°44´ W) of the Instituto de Investigaciones Agropecuarias (INIA). The soil is alluvial antropic miscellaneous (Entisols). Three fertilization treatments were established: 1) N 160 + P2O5 200 + K2O 300; 2) N 160 + P2O5 0 + K2O 300; and 3) N 160 + P2O5 200 + K2O 0. At the beginning of the experiment, grape vines received all the phosphate fertilizers, 200 kg ha-1 of P2O5 as triple superphosphate in Treatments 1 and 3. Nitrogen was applied as urea for four years. The applications were initiated when the vine buds measured 20 cm. The K was applied to... |
| Tipo: Journal article |
Palavras-chave: Grapes; Fertilization; Phosphorus; Potassium. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300010 |
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| Registros recuperados: 98 | |
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