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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
20/12/2010 |
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Data da última atualização: |
17/11/2014 |
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Autoria: |
HILLEL, D.; VLEK, P. |
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Afiliação: |
DANIEL HILLEL, Columbia University; PAUL VLEK, University of Bonn. |
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Título: |
The sustainability of irrigation. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Advances in Agronomy, v. 87, p. 55-84, 2005. |
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Idioma: |
Inglês |
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Conteúdo: |
Irrigation is the supply of water to agricultural crops by artificial means, designed to permit farming in arid regions and to offset periodic droughts in semiarid regions. Even in regions where total seasonal rainfall is adequate on average, it may be poorly distributed during the growing season and variable from season to season. Wherever traditional rain?fed farming is a high?risk enterprise, irrigation can help to ensure stable production. Irrigation has long played a key role in feeding expanding populations and is expected to play a still greater role in the future. Although irrigated land amounts to only some 17% of the world's cropland, it contributes well over 30% of the total agricultural production. That vital contribution is even greater in arid regions, where the supply of water by rainfall is least and the demand for water imposed by the bright sun and the dry wind is greatest. |
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Thesaurus Nal: |
climate change; irrigation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01308naa a2200157 a 4500
001 1870372
005 2014-11-17
008 2005 bl --- 0-- u #d
100 1 $aHILLEL, D.
245 $aThe sustainability of irrigation.$h[electronic resource]
260 $c2005
520 $aIrrigation is the supply of water to agricultural crops by artificial means, designed to permit farming in arid regions and to offset periodic droughts in semiarid regions. Even in regions where total seasonal rainfall is adequate on average, it may be poorly distributed during the growing season and variable from season to season. Wherever traditional rain?fed farming is a high?risk enterprise, irrigation can help to ensure stable production. Irrigation has long played a key role in feeding expanding populations and is expected to play a still greater role in the future. Although irrigated land amounts to only some 17% of the world's cropland, it contributes well over 30% of the total agricultural production. That vital contribution is even greater in arid regions, where the supply of water by rainfall is least and the demand for water imposed by the bright sun and the dry wind is greatest.
650 $aclimate change
650 $airrigation
700 1 $aVLEK, P.
773 $tAdvances in Agronomy$gv. 87, p. 55-84, 2005.
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Embrapa Trigo (CNPT) |
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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
06/06/2008 |
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Data da última atualização: |
02/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FAGERIA, N. K.; BALIGAR, V. C.; LI, Y. C. |
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Afiliação: |
NAND KUMAR FAGERIA, CNPAF; V. C. BALIGAR, USDA; Y. C. LI. |
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Título: |
The role of nutrient efficient plants in improving crop yields in the twenty first century. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Journal of Plant Nutrition, v. 31, n. 6, p. 1121-1157, June 2008. |
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DOI: |
https://doi.org/10.1080/01904160802116068 |
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Idioma: |
Inglês |
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Conteúdo: |
In the 21st century, nutrient efficient plants will play a major role in increasing crop yields compared to the 20th century, mainly due to limited land and water resources available for crop production, higher cost of inorganic fertilizer inputs, declining trends in crop yields globally, and increasing environmental concerns. Furthermore, at least 60% of the world's arable lands have mineral deficiencies or elemental toxicity problems, and on such soils fertilizers and lime amendments are essential for achieving improved crop yields. Fertilizer inputs are increasing cost of production of farmers, and there is a major concern for environmental pollution due to excess fertilizer inputs. Higher demands for food and fiber by increasing world populations further enhance the importance of nutrient efficient cultivars that are also higher producers. Nutrient efficient plants are defined as those plants, which produce higher yields per unit of nutrient, applied or absorbed than other plants (standards) under similar agroecological conditions. During the last three decades, much research has been conducted to identify and/or breed nutrient efficient plant species or genotypes/cultivars within species and to further understand the mechanisms of nutrient efficiency in crop plants. However, success in releasing nutrient efficient cultivars has been limited. The main reasons for limited success are that the genetics of plant responses to nutrients and plant interactions with environmental variables are not well understood. Complexity of genes involved in nutrient use efficiency for macro and micronutrients and limited collaborative efforts between breeders, soil scientists, physiologists, and agronomists to evaluate nutrient efficiency issues on a holistic basis have hampered progress in this area. Hence, during the 21st century agricultural scientists have tremendous challenges, as well as opportunities, to develop nutrient efficient crop plants and to develop best management practices that increase the plant efficiency for utilization of applied fertilizers. During the 20th century, breeding for nutritional traits has been proposed as a strategy to improve the efficiency of fertilizer use or to obtain higher yields in low input agricultural systems. This strategy should continue to receive top priority during the 21st century for developing nutrient efficient crop genotypes. This paper over views the importance of nutrient efficient plants in increasing crop yields in modern agriculture. Further, definitions and available methods of calculating nutrient use efficiency, mechanisms for nutrient uptake and use efficiency, role of crops in nutrient use efficiency under biotic and abiotic stresses and breeding strategies to improve nutrient use efficiency in crop plants have been discussed. MenosIn the 21st century, nutrient efficient plants will play a major role in increasing crop yields compared to the 20th century, mainly due to limited land and water resources available for crop production, higher cost of inorganic fertilizer inputs, declining trends in crop yields globally, and increasing environmental concerns. Furthermore, at least 60% of the world's arable lands have mineral deficiencies or elemental toxicity problems, and on such soils fertilizers and lime amendments are essential for achieving improved crop yields. Fertilizer inputs are increasing cost of production of farmers, and there is a major concern for environmental pollution due to excess fertilizer inputs. Higher demands for food and fiber by increasing world populations further enhance the importance of nutrient efficient cultivars that are also higher producers. Nutrient efficient plants are defined as those plants, which produce higher yields per unit of nutrient, applied or absorbed than other plants (standards) under similar agroecological conditions. During the last three decades, much research has been conducted to identify and/or breed nutrient efficient plant species or genotypes/cultivars within species and to further understand the mechanisms of nutrient efficiency in crop plants. However, success in releasing nutrient efficient cultivars has been limited. The main reasons for limited success are that the genetics of plant responses to nutrients and plant interactions with environment... Mostrar Tudo |
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Palavras-Chave: |
Crop species; Eficiência do uso de nutrientes; Espécies de culturas; Estresses abióticos; Estresses bióticos; Plant; Produção de grãos; Root geometry. |
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Thesagro: |
Nutriente; Planta. |
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Thesaurus NAL: |
abiotic stress; biotic stress; grain yield; nutrient use efficiency. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 03806naa a2200325 a 4500
001 1216835
005 2022-06-02
008 2008 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1080/01904160802116068$2DOI
100 1 $aFAGERIA, N. K.
245 $aThe role of nutrient efficient plants in improving crop yields in the twenty first century.$h[electronic resource]
260 $c2008
520 $aIn the 21st century, nutrient efficient plants will play a major role in increasing crop yields compared to the 20th century, mainly due to limited land and water resources available for crop production, higher cost of inorganic fertilizer inputs, declining trends in crop yields globally, and increasing environmental concerns. Furthermore, at least 60% of the world's arable lands have mineral deficiencies or elemental toxicity problems, and on such soils fertilizers and lime amendments are essential for achieving improved crop yields. Fertilizer inputs are increasing cost of production of farmers, and there is a major concern for environmental pollution due to excess fertilizer inputs. Higher demands for food and fiber by increasing world populations further enhance the importance of nutrient efficient cultivars that are also higher producers. Nutrient efficient plants are defined as those plants, which produce higher yields per unit of nutrient, applied or absorbed than other plants (standards) under similar agroecological conditions. During the last three decades, much research has been conducted to identify and/or breed nutrient efficient plant species or genotypes/cultivars within species and to further understand the mechanisms of nutrient efficiency in crop plants. However, success in releasing nutrient efficient cultivars has been limited. The main reasons for limited success are that the genetics of plant responses to nutrients and plant interactions with environmental variables are not well understood. Complexity of genes involved in nutrient use efficiency for macro and micronutrients and limited collaborative efforts between breeders, soil scientists, physiologists, and agronomists to evaluate nutrient efficiency issues on a holistic basis have hampered progress in this area. Hence, during the 21st century agricultural scientists have tremendous challenges, as well as opportunities, to develop nutrient efficient crop plants and to develop best management practices that increase the plant efficiency for utilization of applied fertilizers. During the 20th century, breeding for nutritional traits has been proposed as a strategy to improve the efficiency of fertilizer use or to obtain higher yields in low input agricultural systems. This strategy should continue to receive top priority during the 21st century for developing nutrient efficient crop genotypes. This paper over views the importance of nutrient efficient plants in increasing crop yields in modern agriculture. Further, definitions and available methods of calculating nutrient use efficiency, mechanisms for nutrient uptake and use efficiency, role of crops in nutrient use efficiency under biotic and abiotic stresses and breeding strategies to improve nutrient use efficiency in crop plants have been discussed.
650 $aabiotic stress
650 $abiotic stress
650 $agrain yield
650 $anutrient use efficiency
650 $aNutriente
650 $aPlanta
653 $aCrop species
653 $aEficiência do uso de nutrientes
653 $aEspécies de culturas
653 $aEstresses abióticos
653 $aEstresses bióticos
653 $aPlant
653 $aProdução de grãos
653 $aRoot geometry
700 1 $aBALIGAR, V. C.
700 1 $aLI, Y. C.
773 $tJournal of Plant Nutrition$gv. 31, n. 6, p. 1121-1157, June 2008.
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