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Registro Completo |
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Biblioteca(s): |
Embrapa Agroindústria Tropical; Embrapa Amazônia Ocidental. |
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Data corrente: |
06/07/1993 |
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Data da última atualização: |
06/07/1993 |
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Autoria: |
CONRAD, J. P.; VEIHMEYER, F. J. |
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Título: |
Root development and soil moisture. |
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Ano de publicação: |
1929 |
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Fonte/Imprenta: |
Hilgardia, v.4, n.4, p.113-134, May, 1929. |
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Idioma: |
Inglês |
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Conteúdo: |
In all studies on the water relations of plants in which soil moisture is involved, much greater care should be given to the manner of taking the samples and to the interpretation of the results. The use of the moisture equivalent for the reduction of moisture contents to a common basis is suggested. Variations in soil texture that are not interpreted by moisture equivalents or by any other of the so-called soil-moisture constants may be great enough to make the results unreliable unless many samples are taken for each condition investigated. The data in this paper indicate that moisture under rows of grainsorghum plants is apparently extracted in successive zones and the extraction is progressive whenever no material additions of moisture occur during the growing season. The percentages for relative wetness expressed as ratios of soilmoisture contents to their respective moisture equivalents, may be used to indicate the development of roots, and the results of adequate moisture samples, taken at proper times, indicate with a fair degree of accuracy the presence or absence of roots of plants growing on the soil tested. A correlation has been shown to exist under the conditions of this study between the amount of roots and the extent to which the soil has been dried by root activity. The writers reason that if the soil is wet at the beginning of the growing season to the full depth to which roots of plants would normally penetrate, subsequent additions of water by rain or irrigation, unless adverse conditions ... MenosIn all studies on the water relations of plants in which soil moisture is involved, much greater care should be given to the manner of taking the samples and to the interpretation of the results. The use of the moisture equivalent for the reduction of moisture contents to a common basis is suggested. Variations in soil texture that are not interpreted by moisture equivalents or by any other of the so-called soil-moisture constants may be great enough to make the results unreliable unless many samples are taken for each condition investigated. The data in this paper indicate that moisture under rows of grainsorghum plants is apparently extracted in successive zones and the extraction is progressive whenever no material additions of moisture occur during the growing season. The percentages for relative wetness expressed as ratios of soilmoisture contents to their respective moisture equivalents, may be used to indicate the development of roots, and the results of adequate moisture samples, taken at proper times, indicate with a fair degree of accuracy the presence or absence of roots of plants growing on the soil tested. A correlation has been shown to exist under the conditions of this study between the amount of roots and the extent to which the soil has been dried by root activity. The writers reason that if the soil is wet at the beginning of the growing season to the full depth to which roots of plants would normally penetrate, subsequent additions of water by rain or irr... Mostrar Tudo |
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Palavras-Chave: |
Planta - agua - relacao; Planta - transpiracao; Raizes - desenvolvimento - solo - umidade - relacao; Root; Solo - umidade - determinacao. |
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Thesagro: |
Sorgo. |
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Thesaurus Nal: |
soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02127naa a2200217 a 4500
001 1417620
005 1993-07-06
008 1929 bl --- 0-- u #d
100 1 $aCONRAD, J. P.
245 $aRoot development and soil moisture.
260 $c1929
520 $aIn all studies on the water relations of plants in which soil moisture is involved, much greater care should be given to the manner of taking the samples and to the interpretation of the results. The use of the moisture equivalent for the reduction of moisture contents to a common basis is suggested. Variations in soil texture that are not interpreted by moisture equivalents or by any other of the so-called soil-moisture constants may be great enough to make the results unreliable unless many samples are taken for each condition investigated. The data in this paper indicate that moisture under rows of grainsorghum plants is apparently extracted in successive zones and the extraction is progressive whenever no material additions of moisture occur during the growing season. The percentages for relative wetness expressed as ratios of soilmoisture contents to their respective moisture equivalents, may be used to indicate the development of roots, and the results of adequate moisture samples, taken at proper times, indicate with a fair degree of accuracy the presence or absence of roots of plants growing on the soil tested. A correlation has been shown to exist under the conditions of this study between the amount of roots and the extent to which the soil has been dried by root activity. The writers reason that if the soil is wet at the beginning of the growing season to the full depth to which roots of plants would normally penetrate, subsequent additions of water by rain or irrigation, unless adverse conditions ...
650 $asoil
650 $aSorgo
653 $aPlanta - agua - relacao
653 $aPlanta - transpiracao
653 $aRaizes - desenvolvimento - solo - umidade - relacao
653 $aRoot
653 $aSolo - umidade - determinacao
700 1 $aVEIHMEYER, F. J.
773 $tHilgardia$gv.4, n.4, p.113-134, May, 1929.
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Registro original: |
Embrapa Agroindústria Tropical (CNPAT) |
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