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| Registros recuperados: 163 | |
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| Assis Júnior,Raimundo Nonato de; Mota,Jaedson Cláudio Anunciato; Freire,Alcione Guimarães; Alencar,Thiago Leite de. |
| Abstract The objective of this work was to evaluate soil porous media quality under different uses, as well as to propose a new index to monitor changes in its structure due to management: the Srelative index. An Inceptisol under irrigated banana cultivation and secondary forest, in the Brazilian Apodi Plateau, was evaluated at three soil layers (0.0-0.1, 0.1-0.2, and 0.2-0.3 m) as to: particle size, particle and bulk density, organic matter content, intrinsic permeability to air, and water retention curve. Total porosity, index for pore continuity (defined by the ratio between soil intrinsic permeability to air and aeration porosity), volume of blocked pores, and the S and Srelative indices were determined. The Srelative index was calculated as the ratio... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Blocked porosity; Irrigation management; Pore continuity; Soil management; Soil permeability to air; Srelative index. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901575 |
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| Nascimento,Fábio Nunes do; Andrade Júnior,Aderson Soares de; Bastos,Edson Alves; Ribeiro,Valdenir Queiroz; Lopes,Alzeneide da Silva. |
| Abstract: The objective of this work was to evaluate the stalk yield, technological quality parameters, and sugar and alcohol productions in the first sugarcane (Saccharum officinarum) crop cycle, according to the response to N and K2O applications by subsurface drip fertigation. The experiment was carried out in a dystrophic Ultisol, in a randomized complete block design with four replicates. The treatments consisted of a 2X + 2X + 1 incomplete factorial arrangement with the application of 60, 80, 120, 160, and 180 kg ha-1 N and 60, 80, 120, 160, and 180 kg ha-1 K2O. The maximum estimated yield (217.5 Mg ha-1) was obtained with the application of 180 kg ha-1 N and 60 kg ha-1 K2O. Sugar and alcohol productions increased with N application above 120 kg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum officinarum; Alcohol production; Fertilizer; Irrigation management; Sugarcane juice. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201346 |
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| Gurski,Bruno César; Jerszurki,Daniela; Souza,Jorge Luiz Moretti de. |
| Abstract: The objective of this work was to define the best alternative methods for estimating the reference evapotranspiration (ETo) in the main climatic types (Cfa and Cfb) of the state of Paraná, Brazil. The methods tested were Budyko, Camargo, Hargreaves-Samani, Linacre, and Thornthwaite, which were compared to the ETo calculated with the Penman-Monteith ASCE (EToPM) method, between 1986 and 2015, in eight meteorological stations. The performance of the alternative methods was obtained from the coefficient of determination (R2), index “d” of agreement, index “c” of performance, and root mean square error (RMSE). The Hargreaves-Samani method has a better performance in estimating the ETo for the main climatic types in the state of Paraná. The Camargo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate variability; Irrigation management; Missing climate data; Penman Monteith; Simplified models; Water balance. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000901003 |
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| RIAZ,A.; KHALIQ,A.; FIAZ,S.; NOOR,M.A.; NAWAZ,M.M.; MAHBOOB,W.; ULLAH,S.. |
| ABSTRACT: In direct seeded rice (DSR), flushes of weeds are encountered, and mostly subsequent herbicides need to apply to control weeds that appear later. A farmer friendly approach was hypothesized in present study to integrate the management strategies for water, soil and cost effective weed free rice production. Efficacy of various herbicides in weed control to improve the performance of aerobic rice grown under varying tillage and alternate water regimes was evaluated. Five weed management techniques (weedy check, weed-free, pendimethalin followed by manual weeding, pendimethalin + bispyribac sodium (BS) + bensulfuron (B) and pendimethalin + MCPA) were carried out within the alternate wetting and drying (AWD) regimes (15 and 20 cm depth) under two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerobic rice; Herbicides; Irrigation management; Benefit-cost ratio. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100259 |
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| Registros recuperados: 163 | |
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