|
|
|
| Registros recuperados: 67 | |
|
|
| Silva, Luciana Maria da; Silva Junior, Rogério Lamim; Leão Pereira Resende, Cecília; Marangoni Montes, Rafael; Santiago Silva Benett, Katiane; Benett, Cleiton Gredson Sabin. |
| O presente trabalho teve como objetivo avaliar a influência da adubação com formulados na semeadura e doses de nitrogênio em cobertura sobre as características produtivas do milho cultivado na safrinha. O experimento foi conduzido entre os meses de março a junho de 2018, na fazenda da Universidade Estadual de Goiás, Unidade Universitária de Ipameri-GO. O delineamento experimental utilizado foi o de blocos casualizados no esquema fatorial 3 x 5 sendo três formulações de adubos na semeadura (06-22-12; 08-20-15 e 06-22-12 + 2% de carbono orgânico) e cinco doses de N (0, 50, 100, 150 e 200 kg ha-1) em cobertura, com quatro repetições. Determinou-se o teor de nitrogênio foliar, massa fresca e seca de folhas, altura de plantas, diâmetro do colmo, altura de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Nitrogen fertilization; Fertilizer of planting; Zea mays L.; Adubação nitrogenada; Adubo de plantio. |
| Ano: 2022 |
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6968 |
| |
|
| |
|
|
| Stocker,Vinícius; Souza,Eduardo G. de; Johann,Jerry A.; Beneduzzi,Humberto M.; Silva,Franciléia de O. e. |
| ABSTRACT The application of nitrogen (N) fertilizer is complex and expensive, so its correct management has financial and environmental benefits. The use of optical proximity sensors is a promising technique. However, the movement of the agricultural machinery or of the person carrying the sensor will result in height differences and/or different tilt and twist angles with respect to the canopy. We considered whether these variations would affect the reflectance measurement. In this study, we took normalized difference vegetation index (NDVI) readings of a wheat canopy, to which 90 kg ha-1 of urea had been applied in stage 5, and observed the NDVI in stages 6, 8 and 10.5. We also tested soybeans, to which 90 kg ha-1 of urea had been applied in stage R1,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen fertilization; Precision agriculture; GreenSeeker; NDVI. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000800096 |
| |
|
|
| Aviz,William L. C. de; Lima Junior,Joaquim A. de; Silva,André L. P. da; Oliveira,Pedro D. de; Gama,Cândido M. P.. |
| ABSTRACT Jambu (Acmella oleracea (L.) R.K.) is a short-cycle leafy vegetable from the Amazon region, which needs an adequate availability of water and nutrients, mainly nitrogen, to obtain a rapid mass increase. This research aimed to study the effect of different soil-water stresses and nitrogen doses on jambu cultivation in the state of Pará. The experiments were conducted at the Igarapé-Açu experimental farm of the Federal Rural University of Amazonia (UFRA). The Jamburana variety was used in a 10 × 10 cm spacing, using a randomized block design in a 4 × 4 factorial scheme with three replications. Each plot had a dimension of 0.4 × 0.5 m (0.2 m2), totaling 20 plants in 4 rows, but only the plants of the central rows were useful. Treatments consisted of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acmella oleracea (L.) R.K.; Tensiometry; Dripping; Nitrogen fertilization. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100016 |
| |
|
|
| Bezerra,Francicso M. L.; Freitas,Cley A. S. de; Silva,Alexandre R. A. da; Mota,Suetônio de B.; Aquino,Boanerges F. de. |
| The objective of this study was to evaluate the productive performance of sunflower plants irrigated with different levels of domestic treated sewage and groundwater well with different doses of nitrogen. It was used randomized blocks design in split-split plots with four replications. In the plots, we evaluated the effect of two types of irrigation water, in the subplots we evaluated the five irrigation levels expressed as 25, 50, 75, 100 and 125% of the Class A pan Evaporation (CAE), and in the sub subplots, we evaluated the effect of four different doses of nitrogen (25, 50, 75 and 100 kg ha-1). The irrigation of sunflower with domestic sewage produced greater yield potential of grain and oil. The use of water from treated wastewater can replace up to... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Helianthus annuus; Recycle; Drip irrigation; Nitrogen fertilization. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600014 |
| |
|
|
| Tavares,Armando R; Ferreira,Mauricio L; Jocys,Teresa; Kanashiro,Shoey; Silva,Karina G. |
| ABSTRACT Rhipsalis paradoxa, Rhipsalis baccifera and Hatiora salicornioides are epiphytic cacti from the Atlantic Forest. They have a great ornamental potential due to the exotic characteristic of their joints (stems segments). The study aimed to evaluate the growth and development of roots and shoots as well as macronutrient and micronutrient contents in the joints of these species fertilized with different concentrations of urea as a nitrogen source. The study also analyzed the importance of the root system on nitrogen absorption. Plants were weekly irrigated with modified Hoagland & Arnon solutions with 0, 16.7, 33.3, 49.9 or 66.6 mM N applied as urea. After 180 days of cultivation, plants were separated into joints and roots for biometric and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhipsalis paradoxa; Rhipsalis baccifera; Hatiora salicornioides; Nitrogen fertilization; Stems and roots; Nutrient levels.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362016000300340 |
| |
|
|
| Jorge,Marcos F; Pinho,Camila F; Nascentes,Alexandre L; Alves,Dinara G; Almeida,Gilda V; Silva,Jonathas BG; Silva,Leonardo DB. |
| ABSTRACT The use of wastewater in the fertigation of agricultural crops increases productivity and product quality, and contributes to reduce environmental pollution. In this work, the objective was to evaluate how the use of dairy cattle wastewater (DCWW) in the fertigation of tomatoes affected production and productivity, as well as foliar nutritional contents, in an organic farming system. Treatments consisted of six nitrogen doses (0, 50, 100, 200, 300 and 400%), having N recommendation for tomato (100 kg/ha) as reference, applied using DCWW via fertigation. DCWW is made up of washing water, urine, feces and milk. Stem diameter, branch length, weekly fruit yield per plant and aggregate productivity were evaluated. N, P, K, Ca, Mg, S, Cu, Mn, Fe, Zn and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicum; Foliar analysis; Nitrogen fertilization; Final disposal.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200230 |
| |
|
| |
|
|
| Baptestini,Júlio Cezar M; Oliveira,Rubens A; Vidigal,Sânzio M; Puiatti,Mário; Cecon,Paulo Roberto. |
| ABSTRACT Onion is considered the third most important vegetable in terms of economic value in Brazilian horticulture. The factors of production which most limit the productivity of the species are water and nutrients; so, irrigation and soil fertility control are determinant criteria for crop success. The aim of this study was to evaluate the influence of different water depths and nitrogen doses on the productivity of onion, Aquarius hybrid. Five water depths [(0, 75, 100, 125 and 150% of crop evapotranspiration (ETc)] and five nitrogen doses (0, 120, 180, 240 and 300 kg ha-1, urea form), arranged in a scheme of subdivided plots, in a completely randomized design with four replicates. We used sprinkler irrigation system. Irrigation management and water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allium cepa; Irrigameter; Nitrogen fertilization. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000100073 |
| |
|
|
| Alves,Aglair C; Jesus,Fábio N; Alves,Péricles B; Santos,Hamilton V; Souza,Girlene S; Santos,Anacleto R. |
| ABSTRACT The aim of this study was to evaluate the effect of light quality and nitrogen availability on the biomass production, yield and composition of essential oil of lemon balm (Lippia alba). Five doses of N (0; 40; 80; 120 and 160 kg ha-1) were studied, using urea and three light quality conditions obtained with the use of colored shading nets (blue and red), 50% irradiance and under full sun. The experiment was arranged in a 5x3 factorial scheme, in split plots, with seven replicates. After 60 days of cultivation under the shading nets, a higher dry leaf biomass (4.83 g per plant) was observed in the plants under blue net cultivation at a dose of 102 kg ha-1 of N. The plants grown under full sun presented greater amount of neral and geranial, major... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lippia alba; Shading nets; Nitrogen fertilization; Medicinal plant; Light quality. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000100094 |
| |
|
|
| Kotz-Gurgacz,Tailene Elisa; Soratto,Rogério Peres; Guidorizzi,Fernando Vieira Costa. |
| Abstract: The objective of this work was to evaluate the effect of applying N sources to leaves and N rates to the soil on the growth, N uptake, and grain and crude protein yields of the common bean (Phaseolus vulgaris) crop. Three experiments - two irrigated and one rainfed - were conducted during the 2012/2013 agricultural season, in a randomized complete block design with four replicates. The treatments consisted of the application of: four N rates (0, 45, 90, and 180 kg ha-1) to the soil, as topdressing in the V4 stage; and five N sources/rates - i.e., control, without foliar N application; 2.5 kg ha-1 N as conventional urea (N-CU); 5.0 kg ha-1 N-CU; 2.5 kg ha-1 N as slow-release urea-formaldehyde (N-SR); and 5.0 kg ha-1 N-SR - to leaves, in the R5... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Foliar fertilization; Nitrogen fertilization; Slow release; Urea-formaldehyde. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201329 |
| |
|
| |
|
| |
|
|
| Megda,Michele Xavier Vieira; Mariano,Eduardo; Leite,José Marcos; Megda,Marcio Mahmoud; Trivelin,Paulo Cesar Ocheuze. |
| Abstract: The objective of this work was to evaluate the effect of the application of ammonium chloride as a nitrogen source for sugarcane (Saccharum sp.) on the development of the crop’s shoot and roots during two consecutive cycles. The experiment was conducted on a Typic Hapludox in the first and second sugarcane ratoons. The treatments consisted of four N doses (50, 100, 150, and 200 kg ha-1) applied as ammonium chloride (NH4Cl), besides a control, without the application of N. The increase in the NH4Cl dose increased in up to three times soil electrical conductivity in the layer of 0.0-0.2 m, with a consequent increase in the concentration of chlorine in leaves. In the second cycle, the contents of chlorine increased in 1,900 mg kg-1 in the leaf with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Electrical conductivity; Nitrogen fertilization; Root system; Stalk productivity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102100 |
| |
|
|
| Catuchi,Tiago Aranda; Soratto,Rogério Peres; Francisquini Júnior,Amarildo; Guidorizzi,Fernando Vieira Costa; Tiritan,Carlos Sérgio. |
| Abstract: The objective of this work was to evaluate the nutrition, accumulation of nutrients in residual straw, pure seed yield, and seed quality of the tropical forage grasses 'Mombaça' and 'Xaraés' subjected to topdressing with nitrogen fertilizer management. Field experiments were carried out in the municipalities of Rancharia and Presidente Prudente, in the state of São Paulo, Brazil. The treatments included a control (without N topdressing) and four N fractionation forms at different forage stages: 150 kg ha-1 N, at the vegetative phase (VP); 150 kg ha-1 N, at the beginning of the reproductive phase (RP), between panicle initiation and the prebooting stages; 100 kg ha-1 N, at VP plus 50 kg ha-1 N at RP; and 50 kg ha-1 N at VP plus 100 kg ha-1 N at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Megathyrsus maximus; Urochloa brizantha; Nitrogen fertilization; Nutrient accumulation; Time of application. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102501 |
| |
|
|
| Maia,Suelen Cristina Mendonça; Soratto,Rogério Peres; Liebe,Suzane Maria; Almeida,Adriana Queiroz de. |
| Abstract: The objective of this work was to establish the diagnostic leaf and the nitrogen sufficiency index (NSI) values most appropriate to estimate N requirement by the 'Pérola' common bean (Phaseolus vulgaris), based on chlorophyll meter monitoring. The diagnostic leaf was defined in an experiment with five N rates, and up to four sampling dates of the diagnostic leaves were evaluated (first, second, and third completely expanded leaves from the apex). The NSI was established in two crop seasons, under six N managements: M1, 40 kg ha-1 N at sowing + 80 kg ha-1 10 days after emergence (DAE) + 80 kg ha-1 20 DAE (reference rate); M2, 20 kg ha-1 at sowing + 40 kg ha-1 10 DAE + 40 kg ha-1 20 DAE (recommended rate); M3, 20 kg ha-1 at sowing + 30 kg ha-1 when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Diagnostic leaf; Nitrogen fertilization; Nitrogen sufficiency index; Nitrogen use efficiency; Relative chlorophyll index. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000700512 |
| |
|
|
| Corrêa,Juliano Corulli; Grohskopf,Marco André; Nicoloso,Rodrigo da Silveira; Lourenço,Késia Silva; Martini,Rosemari. |
| Abstract: The objective of this work was to evaluate soil chemical attributes, leaf nitrogen content, and corn and wheat yields under a no-tillage system in response to the application of organic, organomineral, and mineral fertilizers with or without urease and nitrification inhibitors. The experiment was carried out on the field, with one wheat and two corn crops, on a Rhodic Kandiudox, in a randomized complete block design with six replicates. The evaluated treatments were: control, without fertilization; O, poultry litter as an organic fertilizer; O+I, poultry litter and inhibitors; OM, organomineral fertilizer; OM+I, organomineral fertilizer and inhibitors; U, urea as a mineral fertilizer; and U+I, super urea with the urease inhibitor alone. The use... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Zea mays; Agronomic efficiency; Poultry litter; Nitrogen fertilization; Volatilization losses. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000800916 |
| |
|
|
| Araújo,Humberto Sampaio de; Branco,Roberto Botelho Ferraz; Moraes,Carolina Cinto de; Calori,Alex Humberto; Rós,Amarílis Beraldo; Purquerio,Luis Felipe Villani. |
| Abstract: The objective of this work was to evaluate watermelon (Citrullus lanatus) cultivation in regeneration areas of a sugarcane field, under different soil management systems and N fertilization regimes. Two experiments were carried out in the 2014/2015 and 2015/2016 harvest seasons, in areas of sugarcane plantation in Andradina, in the state of São Paulo, Brazil. Cultivations were performed in a randomized complete block design, with plots and subplots, and four replicates. The plots represented the tillage systems (conventional, minimum tillage, and no-tillage), and the subplots, the different N fertilization rates (0, 100, 200, and 300 kg ha-1) applied as topdressing. In 2014/2015, the minimum tillage system resulted in the highest commercial yield... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrullus lanatus; Conservational system; Crop rotation; Nitrogen fertilization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102500 |
| |
|
| |
|
|
| Asci, Serhat; Borisova, Tatiana; VanSickle, John J.; Zotarelli, Lincoln. |
| This study focuses on development of agricultural best management practices (BMPs) for potato production areas in Northeast Florida, and presents the results of the initial situation assessment. BMP implementation is the primary strategy used by agencies and farmers to improve the efficiency and to ensure environmental sustainability of agricultural production. Although BMPs are defined as “economically feasible” and “cost-effective”, economic analysis conducted as a part of BMP development has been limited, leaving the room for disagreement about economic impacts of specific BMPs. As a part of the situation assessment, we used interviews, group discussions, a survey, and a field trip to collect information about farmers’ production practices and to... |
| Tipo: Presentation |
Palavras-chave: Florida potato production; Partial budget analysis; Risk analysis; Best management practice; Nitrogen fertilization; Agribusiness; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Production Economics; Risk and Uncertainty. |
| Ano: 2012 |
URL: http://purl.umn.edu/119797 |
| |
| Registros recuperados: 67 | |
|
|
|
