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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
09/09/1993 |
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Data da última atualização: |
20/04/2023 |
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Autoria: |
WATSON, D. J. |
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Afiliação: |
Rothamsted Experimental Station Harpenden Herts. |
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Título: |
The dependence of net assimilation rate on leaf-area index. |
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Ano de publicação: |
1958 |
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Fonte/Imprenta: |
Annals of Botany, Oxford, v.22, n.85, p.37-54, 1958. |
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Idioma: |
Inglês |
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Conteúdo: |
The leaf-area index (leaf area por unit area of land, L) of field crops of kale and sugar-beet was varied experimentally by removing different fractions of the plant population distributed iniformly through the crop. The net assimilation rate (E) was determined in susequent periods of Io-14 days. For kale, E decreased nearly linearly with increase of L throughout the range fron i to 5. E of sugar-beet was less affected by change in L and was apparently not decreased until L rose above about 3. Because of this dependence of E on L, the rate of dry-matter production per unit area of land, or crop growth-rate (C = EL), showeda curved relation to L; for kale it increased to a maximum when L was between 3 and 4 and fell again at higher values of L. Maximal C for suar-beet crops problaby lies near the upper limit of the current agricultural range, so there is little, if any, scope for increasing the dry-matter yiel by further increase in L. For heavy kale crops L is already far in excess of the optimum, and it may be possible to increase the total dry-matter yield of kale by repeated thinning or defoliation to hold L near the optmum. |
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Thesagro: |
Área Foliar; Crescimento; Doença; Fertilizante; Fisiologia; Fotossíntese; Matéria Seca; Praga; Produção. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01749naa a2200229 a 4500
001 1646281
005 2023-04-20
008 1958 bl uuuu u00u1 u #d
100 1 $aWATSON, D. J.
245 $aThe dependence of net assimilation rate on leaf-area index.$h[electronic resource]
260 $c1958
520 $aThe leaf-area index (leaf area por unit area of land, L) of field crops of kale and sugar-beet was varied experimentally by removing different fractions of the plant population distributed iniformly through the crop. The net assimilation rate (E) was determined in susequent periods of Io-14 days. For kale, E decreased nearly linearly with increase of L throughout the range fron i to 5. E of sugar-beet was less affected by change in L and was apparently not decreased until L rose above about 3. Because of this dependence of E on L, the rate of dry-matter production per unit area of land, or crop growth-rate (C = EL), showeda curved relation to L; for kale it increased to a maximum when L was between 3 and 4 and fell again at higher values of L. Maximal C for suar-beet crops problaby lies near the upper limit of the current agricultural range, so there is little, if any, scope for increasing the dry-matter yiel by further increase in L. For heavy kale crops L is already far in excess of the optimum, and it may be possible to increase the total dry-matter yield of kale by repeated thinning or defoliation to hold L near the optmum.
650 $aÁrea Foliar
650 $aCrescimento
650 $aDoença
650 $aFertilizante
650 $aFisiologia
650 $aFotossíntese
650 $aMatéria Seca
650 $aPraga
650 $aProdução
773 $tAnnals of Botany, Oxford$gv.22, n.85, p.37-54, 1958.
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