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| Registros recuperados: 88 | |
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| Amanullah; Khan, Mir Wali; Almas, Lal K.; Stewart, Bob A.. |
| Potassium (K) and phosphorus (P) application to sunflower (Helianthus annus L.) reduced cost of production, increased seed oil and protein concentration, yield and net returns on the K and P deficient soils in Northwest Pakistan. Field experiment was conducted at the New Developmental Research Farm of NWFP (North West Frontier Province) Agricultural University Peshawar, Pakistan during summer 2006. The experiment was carried out in a randomized complete block design with split plot arrangements using three replications. Six levels of K (0, 25, 50, 75, 100 and 125 kg ha-1) were kept in main plots while four levels of P (0, 45, 90 and 135 kg ha-1) were kept in sub-plots. Increase in K and P levels enhanced seed oil concentration, on the other hand, increase... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Sunflower; Potassium; Phosphorus; Oil; Protein; Economic analysis; Northwest Pakistan; Farm Management; International Development; International Relations/Trade; Production Economics; Productivity Analysis. |
| Ano: 2010 |
URL: http://purl.umn.edu/56437 |
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| Rosas, Francisco. |
| We introduce a world fertilizers model that is capable of producing fertilizer demand projections by crop, by country, by macronutrients, and by year. For each crop, the most relevant countries in terms of production, consumption, or trade are explicitly modeled. The remaining countries are modeled, for each crop, within a regional aggregate. The nutrient coverage includes nitrogen (N), phosphorous (P), and potassium (K). In this report we present the data and procedures used to set up the model as well as the assumptions made. The fertilizer model interacts with the yield equations of the FAPRI-ISU model (Food and Agricultural Policy Research Institute at Iowa State University), and by means of a set of production elasticities, projects each nutrient’s... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agriculture; Fertilizer; Nitrogen; Phosphorous; Policy analysis; Potassium; Projections; Crop Production/Industries; Demand and Price Analysis; Production Economics. |
| Ano: 2011 |
URL: http://purl.umn.edu/103223 |
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| Borgatti,LMO; Albuquerque,R; Meister,NC; Souza,LWO; Lima,FR; Trindade Neto,MA. |
| The aim of this study was to compare performance and carcass characteristics of broilers fed diets with different Dietary Electrolyte balances (DEB) during the summer season. A total of 1,280 one-day-old Ross sexed chicks were distributed in 32 experimental units according to a randomized block design in a 4x2 factorial arrangement (4 levels and 2 sexes) and 4 replicates per treatment (40 birds per replicate). Feed program consisted of 3 phases (1-21, 22-42, 43-49 days of age). Experimental diets were formulated based on corn and soybean meal and adjusted to 210, 250, 290 and 330 mEq/kg of Na + K - Cl through the addition of sodium carbonate, potassium carbonate and ammonium chloride. Weekly measurements of body weight gain and feed intake were done, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broiler performance; Chloride; Electrolytes; Potassium; Sodium. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000300004 |
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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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| Borges,SA; Maiorka,A; Laurentiz,AC; Fischer da Silva,AV; Santin,E; Ariki,J. |
| Two experiments were carried out using 712 day-old chicks to evaluate the electrolytic balance (Na+K-Cl) in pre-starter (1-7 days) broiler diets. The feed, based on corn and soybean meal with 21.5 % protein and 2,900 kcal ME/kg, was offered ad libitum. In experiment I, K level was fixed, and Na and Cl levels were changed, using four 4 treatments and eight replicates of 16 birds. In experiment II, increasing levels of Na and K were used, with a total of four treatments and five repetitions of 10 birds. In both experiments, the dietary electrolytic balance was 40; 140; 240 and 340 mEq/kg. Electrolytic balance caused a quadratic effect on weight gain and feed:gain ratio, and a linear increase in feed intake when the electrolytic balance was increased by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broilers; Chlorine; Electrolytes; Potassium; Sodium. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2002000200008 |
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| Maiorka,A; Magro,N; Bartels,HAS; Kessler,AM; Penz Jr,AM. |
| An experiment with 400 one-day-old male chicks (Ross) was conducted to evaluate the effects of different Na levels (0.10, 0.22, 0.34 and 0.46%) and different cation/anion balances (Na+K-Cl) (100, 150, 200, 250 and 300 meq/kg) in pre-starter diets on broiler performance. The corn and soybean-based diets had 22% crude protein and 2,900 kcal/kg metabolizable energy and were fed ad libitum. Performance data showed a positive quadratic effect of increasing Na levels on feed and water consumption, weight gain and feed conversion. Na+K-Cl also had a quadratic influence on feed intake and weight gain. None of the effects tested affected the amount of water measured in excreta. Derivatives of obtained regression equations pointed to optimal Na levels of 0.45% for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broiler; Chlorine; Electrolyte balance; Performance; Potassium; Sodium; Water. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000300002 |
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| Arantes,UM; Stringhini,JH; Oliveira,MC; Martins,PC; Rezende,PM; Andrade,MA; Leandro,NSM; Café,MB. |
| The aim of this study was to evaluate the performance, tibial density and mineral content, Na, K ,and Cl serum levels, and dry matter content of the litter of broilers fed diets with different levels of dietary electrolyte balances. Two experiments were carried out: during the starter phase (7 to 21 days of age, 960 broilers) and during the growe phase (22 to 38 days of age, 816 broilers). In both experiments, a completely randomized design with four treatments based on dietary electrolyte balance values (200, 240, 280 and 320 mEq/kg of diet) with four replicates was applied. Birds and diets were weighed when birds were seven, 14 and 21 days of age in the first experiment, and 22 and 38 days of age in the second experiment in order to determine weight... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bone density; Performance; Potassium; Poultry litter; Sodium. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000300010 |
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| Praes,MFFM; Lucas Junior,J; Duarte,KF; Sorbara,JOB; Matos Junior,JB; Sgavioli,S; Domingues,CHF; Garcia,RG; Hermes,RG. |
| Abstract This study evaluated the effects of the dietary inclusion of an enzyme blend and a direct-fed microbials in broiler diets on litter production and quality. In total, 900 Cobb 500(r) broiler chicks were distributed according to a completely randomized design into 4 treatments and 9 replicates of 25 birds each. Broilers were reared from 1 to 42 days of age. The treatments consisted of the following diets: NC: negative control; DFM: NC + 500 ppm of direct-fed microbials product (DFM), containing Bacillus subtilis and Bacillus licheniformis; ENZ: diet formulated with an enzyme blend (20 ppm phytase, 200 ppm protease and 200 ppm of xylanase); DFM+E: ENZ + DFM. Birds and litter were weighed at the start and end of the rearing period, for litter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Waste ratio; Total and thermotolerant coliforms; Phosphorus; Nitrogen; Potassium. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000100125 |
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| Kappes,Claudinei; Zancanaro,Leandro; Francisco,Eros Artur Bohac. |
| ABSTRACT Information on fertilizer management for cotton in narrow-row cropping system is scarce; therefore, studies are needed to improve nutrient stewardship for such systems. The aim of this study was to evaluate the effects of nitrogen and potassium application on yield and fiber quality of cotton under a narrow-row system. A field trial was carried out for three years, where the treatments were set up in an incomplete factorial arrangement [(4 × 4) + 1] under a randomized block design, with four N rates (20, 40, 60, and 80 kg ha-1), four K2O rates (0, 40, 80, and 120 kg ha-1), and one control (no N or K2O), for a total of 17 treatments, with four replicates. Urea and potassium chloride were applied on the soil surface 20 days after crop emergence.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Nitrogen; Potassium; Narrow-row cotton. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100512 |
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| Marques,Douglas José; Broetto,Fernando; Ferreira,Mozart Martins; Lobato,Allan Klynger da Silva; Ávila,Fabricio William de; Pereira,Fabricio José. |
| Potassium participates in the essential processes in plant physiology, however, the effects of K sources on plant metabolism have been little studied. Also, in certain cases, K sources and concentrations may cause undesirable effects, e.g., soil salinization. The objective was to evaluate the effect of K sources and levels on the enzyme activity of the antioxidant system and protein content in eggplant (Solanum melongena L.) leaves and to determine the most suitable K sources for these physiological characteristics. The experiment was conducted in randomized blocks, in a 2 × 4 factorial design, consisting of two K sources (KCl and K2SO4) and rates (250, 500, 750, and 1000 kg ha-1 K2O), with four replications. The following variables were evaluated: plant... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Solanum melongena L.; Potassium; Superoxide dismutase; Catalase; Protein. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000600018 |
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| Gandini,Andrezza Mara Martins; Grazziotti,Paulo Henrique; Rossi,Márcio José; Grazziotti,Danielle Cristina Fonseca Santos; Gandini,Elizzandra Marta Martins; Silva,Enilson de Barros; Ragonezi,Carla. |
| ABSTRACT Ectomycorrhizal fungi (EMF) may improve the adaptation of eucalypts saplings to field conditions and allow more efficient fertilizer use. The effectiveness of EMF inoculum application in promoting fungal colonization, plant growth, nutrient uptake, and the quality of rooted cuttings was evaluated forEucalyptus urophylla under commercial nursery conditions. For inoculated treatments, fertilization of the sapling substrate was reduced by 50 %. The experiment was carried out in a completely randomized design in a 4 × 4 factorial arrangement, wherein the factors were inoculum application rates of 0 (control), 5, 10, and 15 gel beads of calcium alginate containing the vegetative mycelium of Amanita muscaria, Elaphomyces antracinus, Pisolithus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Symbiosis; Plant nutrition; Cuttings production; Phosphorus; Nitrogen; Potassium. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000601554 |
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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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| 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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| Lima,Maria D. de; Pelúzio,Joenes M.; Mandarino,José M. G.; Lima,Divania. |
| ABSTRACT The present study was conducted in order to determine the effects of potassium (K) fertilizer doses on the protein yield of different soybean cultivars, sown in two seasons, in the agricultural year 2013/14 (12/05/13 and 01/23/14), in Palmas-TO, Brazil. The experimental design, in each sowing season, was randomized blocks with 60 treatments and three replicates. The treatments were arranged in a 10 × 6 factorial scheme, represented by ten cultivars (BRS 325RR, M 9144RR, BRS 33871RR, TMG 1288RR, BRS 333RR, P 98Y70RR, TMG 1180RR, BRS 9090RR, M 8766RR and BRS 8990RR) and six doses of K fertilizer (0, 40, 80, 120, 160 and 200 kg ha-1 K2O). The late sowing decreased the protein yield. K fertilization increased the protein yield in soybean cultivars.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Potassium; Planting; Industrial yield. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600392 |
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| Silva,André A. R. da; Lima,Geovani S. de; Azevedo,Carlos A. V. de; Soares,Lauriane A. dos A.; Gheyi,Hans R.; Oliveira,Raucha C. de. |
| ABSTRACT The objective of this study was to evaluate growth, flowering and production components of the cotton cv. ‘BRS Topázio’ irrigated with water of different salinity levels and potassium (K) doses in the soil. The research was conducted in a greenhouse. The experiment was set in a randomized complete block design with four replicates, in 4 x 4 factorial arrangement with 4 levels of irrigation water salinity (1.5, 3.0, 4.5 and 6.0 dS m-1) and four K doses (50, 75, 100 and 125% of the recommendation); the dose of 100% corresponded to 150 mg K2O kg-1 of soil. Irrigation water salinity reduced stem diameter, plant height, number of leaves and leaf area of the cotton cv. ‘BRS Topázio’. Leaf area at 53 DAS was the most affected variable. The highest K dose... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum L.; ‘BRS Topázio’; Salt stress; Potassium. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000900628 |
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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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| Medeiros,Reinaldo F.; Pereira,Walter E.; Rodrigues,Rummenigge de M.; Nascimento,Ronaldo do; Suassuna,Janivan F.; Dantas,Tony A. G.. |
| ABSTRACTStrawberry (Fragaria x ananassa) is a crop that has rapid growth and is highly influenced by fertilization. Due to its development speed, the plant needs to absorb sufficient macronutrients in order to meet its demand. The objective of this research was to evaluate growth and yield of strawberry under different doses of nitrogen (N), phosphorus (P) and potassium (K) fertilization. The treatments, using Box's central composite design, were distributed in randomized blocks with four replicates and consisted of five N doses (0.16, 0.37, 0.88, 1.4 and 1.6 g plant-1) and five P doses (0.3, 0.58, 1.2, 1.8 and 2.1 g plant-1), in the presence (1.67 g plant-1) and absence of K. Seedlings of the cultivar 'Oso Grande' were cultivated in 10-L pots. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fragaria x ananassa Duch.; Nitrogen; Phosphorus; Potassium. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000900865 |
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| Viégas,Ricardo A.; Queiroz,José E.; Silva,Lígia M. de M.; Silveira,Joaquim A. G.; Rocha,Iza M. A.; Viégas,Pedro R. A.. |
| Under NaCl-salinity Na+ and Cl- accumulation of shoot and root vary greatly among glycophyte plants; this is mostly due to genetic diversity and has been utilized to distinguish between plant responses to salinity. The current study aimed to evaluate the accumulation and Na+ and Cl- tissue partitioning and its effect on dry mass gain and K+ accumulation in one-month-old Prosopis juliflora, Leucaena leucocephala, Piptadenia macrocarpa and Mimosa hostilis seedlings grown for 30 days, in sand watered with nutrient solution loading 100 mol m-3 of NaCl, in greenhouse. The Na+ and Cl- accumulation, but not partitioning between shoot and root, depended on plant species. All the plants accumulated Cl- over Na+ both in shoot and root. The K+ content of plants did... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salinity; Potassium; Sodium; Chloride. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662003000200012 |
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| Duarte,Tiago C.; Cruz,Simério C. S.; Soares,Guilherme F.; Sena Júnior,Darly G. de; Machado,Carla G.. |
| ABSTRACT The aim with this study was to evaluate the effects of single- and twin-row spatial arrangements associated with different doses of fertilization on soybean yield and its components. The experiment was carried out at Federal University of Goiás, Campus of Jataí, in a split-plot randomized block design with 10 treatments and four replicates. Each plot corresponded to a dose of P and K fertilization (0, 50, 100, 200 and 400% of the recommended dose) and the subplots to two types of spatial arrangements: single and twin rows. The yield components evaluated were plant final population, number of pods and seeds per plant, number of seeds per pod, weight of a thousand grains and yield. The increase in fertilization dose, even at doses two and four times... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max (L.); Twin rows; Spacing; Phosphorus; Potassium. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001100960 |
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| Registros recuperados: 88 | |
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