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	Provedor de dados NWISRL (2) Autor Adamchuk, V.I. (2) Ferguson, R.B. (2) Kyaw, T. (2) McCallister, D.L. (2) Tarkalson, D.D. (2) Marx, D.B. (1) Mais... Palavra-chave Calcareous soil (1) Corn / maize (1) Fertilizer (1) Mass Import - autoclassified (may be erroneous) (1) Tipo do documento Article (1) Conference or Workshop Item (1) Ano 2008 (1) 2007 (1) País United Kingdom (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Delinearing site-specific management zones for pH-induced iron chlorosis NWISRL Kyaw, T.; Ferguson, R.B.; Adamchuk, V.I.; Marx, D.B.; Tarkalson, D.D.; McCallister, D.L.. Iron chlorosis can limit crop yield, especially on calcareous soil. Typical management for iron chlorosis includes the use of iron fertilizers or chlorosis tolerant cultivars. Calcareous and non-calcareous soil can be interspersed within fields. If chlorosis-prone areas within fields can be predicted accurately, site-specific use of iron fertilizers and chlorosis-tolerant cultivars might be more profitable than uniform management. In this study, the use of vegetation indices (VI) derived from aerial imagery, on-the-go measurement of soil pH and apparent soil electrical conductivity (ECa) were evaluated for their potential to delineate chlorosis management zones. The study was conducted at six sites in 2004 and 2005. There was a significant statistical... Tipo: Article Palavras-chave: Calcareous soil; Fertilizer. Ano: 2008 URL: http://eprints.nwisrl.ars.usda.gov/1275/1/1251.pdf Site-specific management of pH-induced iron chlorosis of maize NWISRL Ferguson, R.B.; Kyaw, T.; Adamchuk, V.I.; Tarkalson, D.D.; McCallister, D.L.. A study was conducted over nine site/years in Nebraska, USA between 2004 and 2005 to evaluate the potential to predict chlorosis-prone areas within fields which are relatively stable in space and time. The study also investigated the potential benefits of site-specific cultivar management according to chlorosis pressure. Sites were mapped for soil apparent electrical conductivity (ECa) at two depths (0-30 cm and 0-90 cm), and soil pH at a depth of 10 cm. Sites were also sampled by hand on a regular grid to a depth of 20 cm and analyzed for a range of soil properties. Sites were evaluated in-season with natural color and near-infrared imagery, and at the end of the season by yield mapping. In all or a portion of each field, replicated paired strips... Tipo: Conference or Workshop Item Palavras-chave: Corn / maize; Mass Import - autoclassified (may be erroneous). Ano: 2007 URL: http://eprints.nwisrl.ars.usda.gov/964/1/1227.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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