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Registro Completo |
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Biblioteca(s): |
Embrapa Algodão. |
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Data corrente: |
22/03/2016 |
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Data da última atualização: |
22/03/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BRANDAO, Z. N.; SOFIATTI, V.; BEZERRA, J. R. C.; FERREIRA, G. B.; MEDEIROS, J. C. |
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Afiliação: |
ZIANY NEIVA BRANDAO, CNPA; VALDINEI SOFIATTI, CNPA; JOSE RENATO CORTEZ BEZERRA, CNPA; GILVAN BARBOSA FERREIRA, CNPA; JOSÉ C. MEDEIROS, CNPA. |
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Título: |
Spectral reflectance for growth and yield assessment of irrigated cotton. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Australian Journal of Crop Science, v. 9, n. 1, p. 75-84, jan. 2015. |
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ISSN: |
1835-2693 |
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Idioma: |
Português |
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Conteúdo: |
The canopy reflectance using ground-based sensors has the potential to provide information on crop nitrogen content. The objective of this study was to determine relationships between canopy spectral reflectance and leaf N content, leaf area index (LAI), aboveground biomass (Biom) and yield of irrigated cotton under four nitrogen rates (0, 90, 180 and 270kg ha-1). Measurements of canopy reflectance were made throughout the growing seasons (2009-2010) using a hand-held spectroradiometer. Samples for LAI and Biom were obtained three times from squaring until fruiting. The normalized difference vegetation index (NDVI), soil adjusted vegetation index (SAVI), modified soil adjusted vegetation index (MSAVI) and the modified transformed vegetation index (MTVI2) were calculated from the hyperspectral reflectance data. All vegetation indexes (VIs) and also SPAD-502 readings allowed to figure out mathematical models for N content prediction in cotton leaves with great precision (r > 0.74). It also showed good correlations (r from 0.55 to 0.96) with the LAI since the first flowering. The vegetation indexes obtained through the canopy reflectance, explained more than 64% of the variation in cotton biomass. The MTVI2 was the index that provided the best LAI prediction in advanced stages. The peak flowering stage was the best time to estimate the cotton biomass, where the MSAVI and MTVI2 showed to be excellent predictors. The results indicate that the cotton yield can be estimated through the hyperspectral reflectance since the squaring until fruiting in irrigated conditions. MenosThe canopy reflectance using ground-based sensors has the potential to provide information on crop nitrogen content. The objective of this study was to determine relationships between canopy spectral reflectance and leaf N content, leaf area index (LAI), aboveground biomass (Biom) and yield of irrigated cotton under four nitrogen rates (0, 90, 180 and 270kg ha-1). Measurements of canopy reflectance were made throughout the growing seasons (2009-2010) using a hand-held spectroradiometer. Samples for LAI and Biom were obtained three times from squaring until fruiting. The normalized difference vegetation index (NDVI), soil adjusted vegetation index (SAVI), modified soil adjusted vegetation index (MSAVI) and the modified transformed vegetation index (MTVI2) were calculated from the hyperspectral reflectance data. All vegetation indexes (VIs) and also SPAD-502 readings allowed to figure out mathematical models for N content prediction in cotton leaves with great precision (r > 0.74). It also showed good correlations (r from 0.55 to 0.96) with the LAI since the first flowering. The vegetation indexes obtained through the canopy reflectance, explained more than 64% of the variation in cotton biomass. The MTVI2 was the index that provided the best LAI prediction in advanced stages. The peak flowering stage was the best time to estimate the cotton biomass, where the MSAVI and MTVI2 showed to be excellent predictors. The results indicate that the cotton yield can be estimated through... Mostrar Tudo |
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Palavras-Chave: |
Irrigated cotton; Nitrogen fertilization. |
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Thesagro: |
Algodão; Área foliar; Gossypium hirsutum. |
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Thesaurus Nal: |
leaf area index; remote sensing. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/141569/1/Spectral-reflectance-for-growth-....pdf
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Marc: |
LEADER 02356naa a2200265 a 4500
001 2041649
005 2016-03-22
008 2015 bl uuuu u00u1 u #d
022 $a1835-2693
100 1 $aBRANDAO, Z. N.
245 $aSpectral reflectance for growth and yield assessment of irrigated cotton.$h[electronic resource]
260 $c2015
520 $aThe canopy reflectance using ground-based sensors has the potential to provide information on crop nitrogen content. The objective of this study was to determine relationships between canopy spectral reflectance and leaf N content, leaf area index (LAI), aboveground biomass (Biom) and yield of irrigated cotton under four nitrogen rates (0, 90, 180 and 270kg ha-1). Measurements of canopy reflectance were made throughout the growing seasons (2009-2010) using a hand-held spectroradiometer. Samples for LAI and Biom were obtained three times from squaring until fruiting. The normalized difference vegetation index (NDVI), soil adjusted vegetation index (SAVI), modified soil adjusted vegetation index (MSAVI) and the modified transformed vegetation index (MTVI2) were calculated from the hyperspectral reflectance data. All vegetation indexes (VIs) and also SPAD-502 readings allowed to figure out mathematical models for N content prediction in cotton leaves with great precision (r > 0.74). It also showed good correlations (r from 0.55 to 0.96) with the LAI since the first flowering. The vegetation indexes obtained through the canopy reflectance, explained more than 64% of the variation in cotton biomass. The MTVI2 was the index that provided the best LAI prediction in advanced stages. The peak flowering stage was the best time to estimate the cotton biomass, where the MSAVI and MTVI2 showed to be excellent predictors. The results indicate that the cotton yield can be estimated through the hyperspectral reflectance since the squaring until fruiting in irrigated conditions.
650 $aleaf area index
650 $aremote sensing
650 $aAlgodão
650 $aÁrea foliar
650 $aGossypium hirsutum
653 $aIrrigated cotton
653 $aNitrogen fertilization
700 1 $aSOFIATTI, V.
700 1 $aBEZERRA, J. R. C.
700 1 $aFERREIRA, G. B.
700 1 $aMEDEIROS, J. C.
773 $tAustralian Journal of Crop Science$gv. 9, n. 1, p. 75-84, jan. 2015.
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Registro original: |
Embrapa Algodão (CNPA) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite; Embrapa Unidades Centrais. |
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Data corrente: |
23/06/1999 |
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Data da última atualização: |
16/08/2022 |
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Autoria: |
COSER, A. C.; MARTINS, C. E.; FONSECA, D. M. da; SALGADO, L. T.; ALVIM, M. J.; TEIXEIRA, F. V. |
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Afiliação: |
CNPGL. |
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Título: |
Efeito de diferentes períodos de ocupação da pastagem de capim-elefante sobre a produção de leite |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v. 34, n. 5, p. 861-866, 1999. |
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Idioma: |
Português |
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Conteúdo: |
RESUMO - O trabalho objetivou determinar o melhor periodo de ocupacao de pastagem de capim-elefante (Pennisetum purpureum Schum. cv. Napier), na producao de leite. Foram testados tres periodos de ocupacao (1, 3 e 5 dias de pastejo), com 30 dias de descando. O delineamento experimental usado foi de blocos casualizados, com duas repeticoes, durante tres anos. Foi usada uma taxa de lotacao de 4 UA/ha. Durante o periodo experimental os animais recebiam suplementacao concentrada, a base de 2,0 kg/vaca/dia. Foram realizadas estimativas da disponibilidade e qualidade da forragem, da altura das plantas e da cobertura do solo a cada 14 dias, e registradas as producoes de leite, diariamente. De acordo com os resultados, a disponibilidade e a qualidade da forragem e a producao de leite nao foram influenciados pelos diferentes periodos de ocupacao. No periodo das aguas, foram observadas producoes de leite de 10,9, 10,8 e 10,8 kg/vaca/dia e 7.848, 7.800 e 7.776 kg/ha, nos tratamentos de 1, 3 e 5 dias de ocupacao, respectivamente (P>0,05). As maiores flutuacoes na producao diaria de leite por vaca ocorreram no tratamento com cinco dias de pastejo, explicadas pela reducao de forragem em quantidade e qualidade, ao longo do periodo de ocupacao em cada piquete. ABSTRACT - Elephant grass (Pennisetum purpureum Schum. cv. Napier) pastures were grazed by lactating dairy cows with the aim of assessing the best grazing period to maximize milk production. Three grazing periods (1, 3 and 5 days, with 30 days resting) were tested using a randomized block design, with two replications, during three years. Each paddock was grazed by 4 milking cows. During the experimental period, the cows received individually 2,0 kg/day of a concentrate mixture. Estimates of forage availability and quality, plant height, ground cover and milk production, were recorded. Results showed that available forage and quality and milk production were not influenced by the three different grazing periods. Average milk production/cow/day in the rainy season were 10.9, 10.8 and 10.8 kg and the average milk yields per hectare were 7,848, 7,800 and 7,776 kg/ha for 1, 3 or 5 grazing days, respectively (P>0.05). The largest flotations in dairy milk yield per cow occurred in the five grazing days treatment, explained for both forage availability and quality decreases along the grazing period on each paddock. MenosRESUMO - O trabalho objetivou determinar o melhor periodo de ocupacao de pastagem de capim-elefante (Pennisetum purpureum Schum. cv. Napier), na producao de leite. Foram testados tres periodos de ocupacao (1, 3 e 5 dias de pastejo), com 30 dias de descando. O delineamento experimental usado foi de blocos casualizados, com duas repeticoes, durante tres anos. Foi usada uma taxa de lotacao de 4 UA/ha. Durante o periodo experimental os animais recebiam suplementacao concentrada, a base de 2,0 kg/vaca/dia. Foram realizadas estimativas da disponibilidade e qualidade da forragem, da altura das plantas e da cobertura do solo a cada 14 dias, e registradas as producoes de leite, diariamente. De acordo com os resultados, a disponibilidade e a qualidade da forragem e a producao de leite nao foram influenciados pelos diferentes periodos de ocupacao. No periodo das aguas, foram observadas producoes de leite de 10,9, 10,8 e 10,8 kg/vaca/dia e 7.848, 7.800 e 7.776 kg/ha, nos tratamentos de 1, 3 e 5 dias de ocupacao, respectivamente (P>0,05). As maiores flutuacoes na producao diaria de leite por vaca ocorreram no tratamento com cinco dias de pastejo, explicadas pela reducao de forragem em quantidade e qualidade, ao longo do periodo de ocupacao em cada piquete. ABSTRACT - Elephant grass (Pennisetum purpureum Schum. cv. Napier) pastures were grazed by lactating dairy cows with the aim of assessing the best grazing period to maximize milk production. Three grazing periods (1, 3 and 5 days, with... Mostrar Tudo |
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Palavras-Chave: |
Capim-elefante; Dias de descanso; Dias de ocupacao; Grazing days; Pastagens; Periodos de ocupacao; Producao de leite; Resting period. |
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Thesagro: |
Pastejo Rotativo; Produção Animal. |
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Thesaurus NAL: |
animal production; rotational grazing. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/5922/1/PAB97170.pdf
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Marc: |
LEADER 03339naa a2200325 a 4500
001 1593473
005 2022-08-16
008 1999 bl uuuu u00u1 u #d
100 1 $aCOSER, A. C.
245 $aEfeito de diferentes períodos de ocupação da pastagem de capim-elefante sobre a produção de leite
260 $c1999
520 $aRESUMO - O trabalho objetivou determinar o melhor periodo de ocupacao de pastagem de capim-elefante (Pennisetum purpureum Schum. cv. Napier), na producao de leite. Foram testados tres periodos de ocupacao (1, 3 e 5 dias de pastejo), com 30 dias de descando. O delineamento experimental usado foi de blocos casualizados, com duas repeticoes, durante tres anos. Foi usada uma taxa de lotacao de 4 UA/ha. Durante o periodo experimental os animais recebiam suplementacao concentrada, a base de 2,0 kg/vaca/dia. Foram realizadas estimativas da disponibilidade e qualidade da forragem, da altura das plantas e da cobertura do solo a cada 14 dias, e registradas as producoes de leite, diariamente. De acordo com os resultados, a disponibilidade e a qualidade da forragem e a producao de leite nao foram influenciados pelos diferentes periodos de ocupacao. No periodo das aguas, foram observadas producoes de leite de 10,9, 10,8 e 10,8 kg/vaca/dia e 7.848, 7.800 e 7.776 kg/ha, nos tratamentos de 1, 3 e 5 dias de ocupacao, respectivamente (P>0,05). As maiores flutuacoes na producao diaria de leite por vaca ocorreram no tratamento com cinco dias de pastejo, explicadas pela reducao de forragem em quantidade e qualidade, ao longo do periodo de ocupacao em cada piquete. ABSTRACT - Elephant grass (Pennisetum purpureum Schum. cv. Napier) pastures were grazed by lactating dairy cows with the aim of assessing the best grazing period to maximize milk production. Three grazing periods (1, 3 and 5 days, with 30 days resting) were tested using a randomized block design, with two replications, during three years. Each paddock was grazed by 4 milking cows. During the experimental period, the cows received individually 2,0 kg/day of a concentrate mixture. Estimates of forage availability and quality, plant height, ground cover and milk production, were recorded. Results showed that available forage and quality and milk production were not influenced by the three different grazing periods. Average milk production/cow/day in the rainy season were 10.9, 10.8 and 10.8 kg and the average milk yields per hectare were 7,848, 7,800 and 7,776 kg/ha for 1, 3 or 5 grazing days, respectively (P>0.05). The largest flotations in dairy milk yield per cow occurred in the five grazing days treatment, explained for both forage availability and quality decreases along the grazing period on each paddock.
650 $aanimal production
650 $arotational grazing
650 $aPastejo Rotativo
650 $aProdução Animal
653 $aCapim-elefante
653 $aDias de descanso
653 $aDias de ocupacao
653 $aGrazing days
653 $aPastagens
653 $aPeriodos de ocupacao
653 $aProducao de leite
653 $aResting period
700 1 $aMARTINS, C. E.
700 1 $aFONSECA, D. M. da
700 1 $aSALGADO, L. T.
700 1 $aALVIM, M. J.
700 1 $aTEIXEIRA, F. V.
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv. 34, n. 5, p. 861-866, 1999.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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