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Registro Completo |
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
24/02/2011 |
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Data da última atualização: |
03/05/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GUEDES FILHO, O.; VIEIRA, S. R.; CHIBA, M. K.; GREGO, C. R. |
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Afiliação: |
OSVALDO GUEDES FILHO, ESALQ/USP; SIDNEY ROSA VIEIRA, IAC; MARCIO KOITI CHIBA, IAC; CELIA REGINA GREGO, CNPM. |
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Título: |
Geostatistical analysis of crop yield maps in a long term no tillage system. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Bragantia, Campinas, v. 69, suplemento, p. 9-18, 2010. |
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Idioma: |
Inglês |
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Conteúdo: |
It is known, for a long time, that crop yields are not uniform at the field. In some places, it is possible to distinguish sites with both low and high yields even within the same area. This work aimed to evaluate the spatial and temporal variability of some crop yields and to identify potential zones for site specific management in an area under no-tillage system for 23 years. Data were analyzed from a 3.42 ha long term experimental area at the Centro Experimental Central of the Instituto Agronômico, located in Campinas, São Paulo State, Brazil. The crop yield data evaluated included the following crops: soybean, maize, lablab and triticale, and all of them were cultivated since 1985 and sampled at a regular grid of 302 points. Data were normalized and analyzed using descriptive statistics and geostatistical tools in order to demonstrate and describe the structure of the spatial variability. All crop yields showed high variability. All of them also showed spatial dependence and were fitted to the spherical model, except for the yield of the maize in 1999 productivity which was fitted to the exponential model. The north part of the area presented repeated high values of productivity in some years. There was a positive cross correlation amongst the productivity values, especially for the maize crops. |
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Palavras-Chave: |
Cross semivariogram; Management zones; Spatial variability. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/28511/1/03ap.pdf
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Marc: |
LEADER 01872naa a2200193 a 4500
001 1878781
005 2019-05-03
008 2010 bl uuuu u00u1 u #d
100 1 $aGUEDES FILHO, O.
245 $aGeostatistical analysis of crop yield maps in a long term no tillage system.
260 $c2010
520 $aIt is known, for a long time, that crop yields are not uniform at the field. In some places, it is possible to distinguish sites with both low and high yields even within the same area. This work aimed to evaluate the spatial and temporal variability of some crop yields and to identify potential zones for site specific management in an area under no-tillage system for 23 years. Data were analyzed from a 3.42 ha long term experimental area at the Centro Experimental Central of the Instituto Agronômico, located in Campinas, São Paulo State, Brazil. The crop yield data evaluated included the following crops: soybean, maize, lablab and triticale, and all of them were cultivated since 1985 and sampled at a regular grid of 302 points. Data were normalized and analyzed using descriptive statistics and geostatistical tools in order to demonstrate and describe the structure of the spatial variability. All crop yields showed high variability. All of them also showed spatial dependence and were fitted to the spherical model, except for the yield of the maize in 1999 productivity which was fitted to the exponential model. The north part of the area presented repeated high values of productivity in some years. There was a positive cross correlation amongst the productivity values, especially for the maize crops.
653 $aCross semivariogram
653 $aManagement zones
653 $aSpatial variability
700 1 $aVIEIRA, S. R.
700 1 $aCHIBA, M. K.
700 1 $aGREGO, C. R.
773 $tBragantia, Campinas$gv. 69, suplemento, p. 9-18, 2010.
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