Registro Completo |
Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
Data corrente: |
09/09/1993 |
Data da última atualização: |
20/04/2023 |
Autoria: |
WATSON, D. J. |
Afiliação: |
Rothamsted Experimental Station Harpenden Herts. |
Título: |
The dependence of net assimilation rate on leaf-area index. |
Ano de publicação: |
1958 |
Fonte/Imprenta: |
Annals of Botany, Oxford, v.22, n.85, p.37-54, 1958. |
Idioma: |
Inglês |
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. |
Thesagro: |
Área Foliar; Crescimento; Doença; Fertilizante; Fisiologia; Fotossíntese; Matéria Seca; Praga; Produção. |
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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Embrapa Mandioca e Fruticultura (CNPMF) |
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