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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
06/09/2002 |
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Data da última atualização: |
25/07/2018 |
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Autoria: |
LUCHIARI JÚNIOR, A.; SHANAHAN, J.; SCHEPERS, J.; FRANCIS, D.; SCHLEMMER, M.; SCHEPERS, A.; INAMASO, R.; FRANCA, G.; MANTOVANI, E.; GOMIDE, R. |
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Afiliação: |
Embrapa Milho e Sorgo; EVANDRO CHARTUNI MANTOVANI, CNPMS; REINALDO LUCIO GOMIDE, CNPMS. |
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Título: |
Crop and soil based approaches for site specific nutrient management. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
In: CONGRESSO NACIONAL DE MILHO E SORGO, 24., 2002, Florianópolis, SC. Meio ambiente e a nova agenda para o agronegócio de milho e sorgo: [palestras]. Sete Lagoas: ABMS: Embrapa Milho e Sorgo; Florianópolis: Epagri, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
Recent precision agriculture research has focused on use of soil- (management zones) and crop-based (crop canopy reflectance determined with on-the-go sensors) methods for variable application of crop inputs such as N. The goal of our work is to show the advancements and applicability of these procedures in the United States and in Brazil obtained in collaborative research developed by ARS and Embrapa. Remotely sensed bare-soil images, elevation data, yield maps and soil electrical conductivity were used to categorize spatial and temporal field variability into management zones. A geo-referenced sampling scheme was designed to obtain soil chemical information for the zones. Stepwise multiple regression analysis was used to identify which indicators of the terrain were associated with spatial variation in crop yield. Elevation, soil color, slope, and soil electrical conductivity accounted for nearly 60% of the spatial variation in average yields, indicating that these variables could be useful when defining management zones. Since soil brightness was correlated with many of the terrain attributes, aerial photography would seem to be a promising method for developing management zones and obtaining important field information related to soil properties and crop productivity. However, because of wide variations in climate and its effect on spatial yield patterns, the management zone concept alone would appear inadequate for variable application of N inputs. A more successful approach would be to use a combination of soil-derived management zones along with the ability to practically monitor in- season crop N status and apply supplemental N as needed. Crop canopy reflectance sensors that measures reflectance at 550, 632, 600, 680 and 800 nm were used to assess chlorophyll status in corn (Zea mays, L.) growing under 5 N rates (0, 50, 100, 150 kg/ha and as needed defined by chlorophyll readings. The sensors are interfaced with a differential global positioning system (DGPS) to facilitate the generation of field reflectance maps. Results show that reflectance data converted into the green normalized difference vegetation index (GNDVI), utilizing the green and NIR bands was the most sensitive to assess variations in leaf chlorophyll content (assumed to be N status induced by varying levels of N application) and that variation in the sensor readings are highly correlated with ground-based chlorophyll meter readings. In the USA, the sensor was mounted on a high-clearance applicator for geo-referenced-on-the-go measurements in an irrigated cornfield. The mapping capabilities of the sensors indicate the potential to detect N stresses and subsequently direct localized application of variable rate N fertilizer. The sensor is robust in its operation and provides a number of data collection options and can be used under cloud conditions. However, significant efforts are still needed to deal with the soil background reflectance under incomplete ground cover situations and to determine the appropriate algorithms to translate sensor output into meaningful management options. MenosRecent precision agriculture research has focused on use of soil- (management zones) and crop-based (crop canopy reflectance determined with on-the-go sensors) methods for variable application of crop inputs such as N. The goal of our work is to show the advancements and applicability of these procedures in the United States and in Brazil obtained in collaborative research developed by ARS and Embrapa. Remotely sensed bare-soil images, elevation data, yield maps and soil electrical conductivity were used to categorize spatial and temporal field variability into management zones. A geo-referenced sampling scheme was designed to obtain soil chemical information for the zones. Stepwise multiple regression analysis was used to identify which indicators of the terrain were associated with spatial variation in crop yield. Elevation, soil color, slope, and soil electrical conductivity accounted for nearly 60% of the spatial variation in average yields, indicating that these variables could be useful when defining management zones. Since soil brightness was correlated with many of the terrain attributes, aerial photography would seem to be a promising method for developing management zones and obtaining important field information related to soil properties and crop productivity. However, because of wide variations in climate and its effect on spatial yield patterns, the management zone concept alone would appear inadequate for variable application of N inputs. A more successful app... Mostrar Tudo |
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Thesagro: |
Solo. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/33872/1/Palestra-Crop-soil.pdf
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Marc: |
LEADER 03936naa a2200241 a 4500
001 1485670
005 2018-07-25
008 2002 bl uuuu u00u1 u #d
100 1 $aLUCHIARI JÚNIOR, A.
245 $aCrop and soil based approaches for site specific nutrient management.$h[electronic resource]
260 $c2002
520 $aRecent precision agriculture research has focused on use of soil- (management zones) and crop-based (crop canopy reflectance determined with on-the-go sensors) methods for variable application of crop inputs such as N. The goal of our work is to show the advancements and applicability of these procedures in the United States and in Brazil obtained in collaborative research developed by ARS and Embrapa. Remotely sensed bare-soil images, elevation data, yield maps and soil electrical conductivity were used to categorize spatial and temporal field variability into management zones. A geo-referenced sampling scheme was designed to obtain soil chemical information for the zones. Stepwise multiple regression analysis was used to identify which indicators of the terrain were associated with spatial variation in crop yield. Elevation, soil color, slope, and soil electrical conductivity accounted for nearly 60% of the spatial variation in average yields, indicating that these variables could be useful when defining management zones. Since soil brightness was correlated with many of the terrain attributes, aerial photography would seem to be a promising method for developing management zones and obtaining important field information related to soil properties and crop productivity. However, because of wide variations in climate and its effect on spatial yield patterns, the management zone concept alone would appear inadequate for variable application of N inputs. A more successful approach would be to use a combination of soil-derived management zones along with the ability to practically monitor in- season crop N status and apply supplemental N as needed. Crop canopy reflectance sensors that measures reflectance at 550, 632, 600, 680 and 800 nm were used to assess chlorophyll status in corn (Zea mays, L.) growing under 5 N rates (0, 50, 100, 150 kg/ha and as needed defined by chlorophyll readings. The sensors are interfaced with a differential global positioning system (DGPS) to facilitate the generation of field reflectance maps. Results show that reflectance data converted into the green normalized difference vegetation index (GNDVI), utilizing the green and NIR bands was the most sensitive to assess variations in leaf chlorophyll content (assumed to be N status induced by varying levels of N application) and that variation in the sensor readings are highly correlated with ground-based chlorophyll meter readings. In the USA, the sensor was mounted on a high-clearance applicator for geo-referenced-on-the-go measurements in an irrigated cornfield. The mapping capabilities of the sensors indicate the potential to detect N stresses and subsequently direct localized application of variable rate N fertilizer. The sensor is robust in its operation and provides a number of data collection options and can be used under cloud conditions. However, significant efforts are still needed to deal with the soil background reflectance under incomplete ground cover situations and to determine the appropriate algorithms to translate sensor output into meaningful management options.
650 $aSolo
700 1 $aSHANAHAN, J.
700 1 $aSCHEPERS, J.
700 1 $aFRANCIS, D.
700 1 $aSCHLEMMER, M.
700 1 $aSCHEPERS, A.
700 1 $aINAMASO, R.
700 1 $aFRANCA, G.
700 1 $aMANTOVANI, E.
700 1 $aGOMIDE, R.
773 $tIn: CONGRESSO NACIONAL DE MILHO E SORGO, 24., 2002, Florianópolis, SC. Meio ambiente e a nova agenda para o agronegócio de milho e sorgo: [palestras]. Sete Lagoas: ABMS: Embrapa Milho e Sorgo; Florianópolis: Epagri, 2002.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
20/10/2008 |
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Data da última atualização: |
19/07/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - C |
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Autoria: |
PINTO NETO, A.; LUCCA, F. M. de; ALBERTON, J.; MOTA, M. F.; LUCACIN, E.; BORGES, A. M.; ACCO, A.; FONSECA, J. F. da; SILVA FILHO, J. M. da; SILVA, A. V. da; BRANDÃO, F. Z. |
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Afiliação: |
Adalgiza Pinto Neto, UNIPAR; Fabiano Mendes de Lucca, bolsita UNIPAR; Jeferson Alberton, UNIPAR; Marcelo Falci Mota, pós-graduação UNIPAR; Eduardo Lucatin, UFMG; Alan Maia Borges, UFPR; Alexandra Acco; JEFERSON FERREIRA DA FONSECA, CNPC; José Monteiro da Silva Filho, UFMG; Aristeu Vieira da Silva, UNIPAR; Felipe Zandonardi Brandão, Universidade Federal Fluminense. |
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Título: |
Avaliação dos efeitos do flunixim meglumine sobre a concentração sérica de progesterona e ciclo estral em novilhas e vacas mestiças. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Revista Brasileira de Ciência Veterinária, v. 15, n. 1, p. 10-14, jan./abr. 2008. |
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Idioma: |
Português |
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Conteúdo: |
Resumo: Baseando-se nos mecanismos de interrupção da síntese de PGF2a em bovinos, objetivou-se com este estudo avaliar os efeitos do flunixin meglumine (FM) sobre o comprimento do ciclo estral e sobre os níveis de progesterona, em novilhas e vacas mestiças. Após sincronização dos estros, os animais foram divididos em grupos: controle (cinco vacas e quatro novilhas) e tratado (seis vacas e seis novilhas), sendo submetidos à colheita diária de sangue, até o estro subseqüente. Do 13o ao 18o dia, aplicou-se nos animais do grupo tratado 1,65 mg/kg intramuscular de FM, e nos do grupo controle, mesmo volume de solução fisiológica. A determinação da concentração sérica de progesterona foi realizada por RIA. Os resultados do comprimento do ciclo estral foram comparados entre os grupos e entre animais, pelo teste t de Student, enquanto a concentração de progesterona foi normalizada em relação à luteólise, e analisada entre os grupos pelo teste t de Tukey (SAS). Não se observou diferença (P>0,05) no comprimento do ciclo estral entre grupos e entre novilhas e vacas, tratadas e não tratadas. O dia do ciclo estral em relação à concentração de progesterona máxima e inferior a 1,0ng/mL, e a concentração sérica de progesterona entre os animais do grupo controle e tratado, também foram semelhantes entre os grupos (P>0,05). No entanto, observou-se diferença (P<0,05) na curva que evidencia a queda da progesterona em relação ao momento da luteólise entre os animais dos grupos experimentais. Conclui-se que, embora se tenha observado efeito do tratamento, como descrito acima, sua ação seria mais bem caracterizada se a população amostral tivesse sido maior. Abstract: This paper reports results from the assessment on the effects of flunixin meglumine (FM) on the estrous cycle and serum levels of progesterone in crossbred cows and heifers. After the estrous synchronization, the animals were separated into two groups: control (5 cows and 4 heifers), and experimental (6 cows and 6 heifers). They were submitted to daily blood sampling until the next estrus. From the 13th to the 18th day of the estrous cycle, each animal from the experimental group received 1.65 mg/kg of FM by intramuscular route, while animals from the control group received equal volumes of sterile saline. Levels of progesterone were measured by radio-immune-assay. The length of estrous cycle was compared among groups and individuals by Student?s t-test, whereas the levels of progesterone were analyzed by Tukey?s t-test. There was no significant difference in the estrous cycle length among groups and individuals. The estrous cycle day, in relation to the concentration of progesterone ? highest and lower to 1.0 ng/ml, and the seric concentration of progesterone among animals from both control and experimental groups were also similar (P>0.05). However, there was no difference concerning the concentration of progesterone decrease among theexperimental groups. It was concluded that, under the conditions this study was carried out, even though the effect of the treatment was observed, its action would be better characterized if the sample population were bigger.(AU) MenosResumo: Baseando-se nos mecanismos de interrupção da síntese de PGF2a em bovinos, objetivou-se com este estudo avaliar os efeitos do flunixin meglumine (FM) sobre o comprimento do ciclo estral e sobre os níveis de progesterona, em novilhas e vacas mestiças. Após sincronização dos estros, os animais foram divididos em grupos: controle (cinco vacas e quatro novilhas) e tratado (seis vacas e seis novilhas), sendo submetidos à colheita diária de sangue, até o estro subseqüente. Do 13o ao 18o dia, aplicou-se nos animais do grupo tratado 1,65 mg/kg intramuscular de FM, e nos do grupo controle, mesmo volume de solução fisiológica. A determinação da concentração sérica de progesterona foi realizada por RIA. Os resultados do comprimento do ciclo estral foram comparados entre os grupos e entre animais, pelo teste t de Student, enquanto a concentração de progesterona foi normalizada em relação à luteólise, e analisada entre os grupos pelo teste t de Tukey (SAS). Não se observou diferença (P>0,05) no comprimento do ciclo estral entre grupos e entre novilhas e vacas, tratadas e não tratadas. O dia do ciclo estral em relação à concentração de progesterona máxima e inferior a 1,0ng/mL, e a concentração sérica de progesterona entre os animais do grupo controle e tratado, também foram semelhantes entre os grupos (P>0,05). No entanto, observou-se diferença (P<0,05) na curva que evidencia a queda da progesterona em relação ao momento da luteólise entre os animais dos grupos experimentais. Conc... Mostrar Tudo |
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Palavras-Chave: |
Flunixin meglumine; Luteólise. |
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Thesagro: |
Bovino; Progesterona; Vaca. |
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Thesaurus NAL: |
Cattle; Progesterone; Reproduction. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/218242/1/CNPC-2014-Art-01.pdf
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Marc: |
LEADER 04183naa a2200337 a 4500
001 1533930
005 2023-07-19
008 2008 bl uuuu u00u1 u #d
100 1 $aPINTO NETO, A.
245 $aAvaliação dos efeitos do flunixim meglumine sobre a concentração sérica de progesterona e ciclo estral em novilhas e vacas mestiças.
260 $c2008
520 $aResumo: Baseando-se nos mecanismos de interrupção da síntese de PGF2a em bovinos, objetivou-se com este estudo avaliar os efeitos do flunixin meglumine (FM) sobre o comprimento do ciclo estral e sobre os níveis de progesterona, em novilhas e vacas mestiças. Após sincronização dos estros, os animais foram divididos em grupos: controle (cinco vacas e quatro novilhas) e tratado (seis vacas e seis novilhas), sendo submetidos à colheita diária de sangue, até o estro subseqüente. Do 13o ao 18o dia, aplicou-se nos animais do grupo tratado 1,65 mg/kg intramuscular de FM, e nos do grupo controle, mesmo volume de solução fisiológica. A determinação da concentração sérica de progesterona foi realizada por RIA. Os resultados do comprimento do ciclo estral foram comparados entre os grupos e entre animais, pelo teste t de Student, enquanto a concentração de progesterona foi normalizada em relação à luteólise, e analisada entre os grupos pelo teste t de Tukey (SAS). Não se observou diferença (P>0,05) no comprimento do ciclo estral entre grupos e entre novilhas e vacas, tratadas e não tratadas. O dia do ciclo estral em relação à concentração de progesterona máxima e inferior a 1,0ng/mL, e a concentração sérica de progesterona entre os animais do grupo controle e tratado, também foram semelhantes entre os grupos (P>0,05). No entanto, observou-se diferença (P<0,05) na curva que evidencia a queda da progesterona em relação ao momento da luteólise entre os animais dos grupos experimentais. Conclui-se que, embora se tenha observado efeito do tratamento, como descrito acima, sua ação seria mais bem caracterizada se a população amostral tivesse sido maior. Abstract: This paper reports results from the assessment on the effects of flunixin meglumine (FM) on the estrous cycle and serum levels of progesterone in crossbred cows and heifers. After the estrous synchronization, the animals were separated into two groups: control (5 cows and 4 heifers), and experimental (6 cows and 6 heifers). They were submitted to daily blood sampling until the next estrus. From the 13th to the 18th day of the estrous cycle, each animal from the experimental group received 1.65 mg/kg of FM by intramuscular route, while animals from the control group received equal volumes of sterile saline. Levels of progesterone were measured by radio-immune-assay. The length of estrous cycle was compared among groups and individuals by Student?s t-test, whereas the levels of progesterone were analyzed by Tukey?s t-test. There was no significant difference in the estrous cycle length among groups and individuals. The estrous cycle day, in relation to the concentration of progesterone ? highest and lower to 1.0 ng/ml, and the seric concentration of progesterone among animals from both control and experimental groups were also similar (P>0.05). However, there was no difference concerning the concentration of progesterone decrease among theexperimental groups. It was concluded that, under the conditions this study was carried out, even though the effect of the treatment was observed, its action would be better characterized if the sample population were bigger.(AU)
650 $aCattle
650 $aProgesterone
650 $aReproduction
650 $aBovino
650 $aProgesterona
650 $aVaca
653 $aFlunixin meglumine
653 $aLuteólise
700 1 $aLUCCA, F. M. de
700 1 $aALBERTON, J.
700 1 $aMOTA, M. F.
700 1 $aLUCACIN, E.
700 1 $aBORGES, A. M.
700 1 $aACCO, A.
700 1 $aFONSECA, J. F. da
700 1 $aSILVA FILHO, J. M. da
700 1 $aSILVA, A. V. da
700 1 $aBRANDÃO, F. Z.
773 $tRevista Brasileira de Ciência Veterinária$gv. 15, n. 1, p. 10-14, jan./abr. 2008.
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Embrapa Caprinos e Ovinos (CNPC) |
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