1967
DOI: 10.1111/j.1365-2389.1967.tb01497.x
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Soil Factors Affecting Plant Uptake of Phosphate

Abstract: Short-and long-term uptake of phosphate by ryegrass grown in pots were both well correlated with combinations of the logarithm of the phosphate concentration in solution (logp]), with a capacity factor (L-value). It is suggested that logIp] measures an intensity/kinetic complex that takes account of intensity, rate, and diffusion factors. The best correlation with a single parameter WBO with phosphate adsorbed by anion-exchange resin, which gives a good measure of the capacity factor and also some measure of t… Show more

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Cited by 50 publications
(20 citation statements)
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“…The amounts of extractable P differed greatly between the methods, the overall mean values (in mgkg -1) being 31.88 (Resin-a), 29.01 (Resin8-P), 8.66 (Resinl-P), 8.83 (Exch-P), 1.15 (Olsen-P) and 0.102 (KC1-P). In general, there were significant positive effects of 1988-P on extractable P, but no significant effects of 1987-P (Tables 1 and 2).…”
Section: Response Of Extractable P To 1987-p and 1988-pmentioning
confidence: 96%
“…The amounts of extractable P differed greatly between the methods, the overall mean values (in mgkg -1) being 31.88 (Resin-a), 29.01 (Resin8-P), 8.66 (Resinl-P), 8.83 (Exch-P), 1.15 (Olsen-P) and 0.102 (KC1-P). In general, there were significant positive effects of 1988-P on extractable P, but no significant effects of 1987-P (Tables 1 and 2).…”
Section: Response Of Extractable P To 1987-p and 1988-pmentioning
confidence: 96%
“…The higher amount of P extracted from the Hoda soil by this extractant suggests that this method not only considers the intensity but also gives a better estimation of the capacity factor, as observed by Gunary & Sutton (1967) and Hislop & Cooke (1968).…”
Section: P Availability Estimated By Chemical Methodsmentioning
confidence: 94%
“…Extratores químicos, como o Mehlich-1, têm acesso a formas de P que variam entre o P em solução (fator intensidade) e o P lábil (fator capacidade), podendo, também, em certas situações, extrair parte do P não-lábil, sendo seus resultados influenciados por características do solo, principalmente, por aquelas ligadas ao fator capacidade ou poder-tampão (Novais & Smyth, 1999). Para compensar o efeito do desgaste de extratores químicos, caracterizado pelo aumento do pH e adsorção de ânions de troca (SO 4 2-e Cl -no caso do Mehlich-1), por características do solo relacionadas com o fator capacidade, torna-se necessária a inclusão de medida deste fator, como o teor de argila (Gunary & Sutton, 1967) e, mais recentemente, o P-remanescente (Alvarez V. et al, 2000), na interpretação dos resultados destes métodos (CFSEMG, 1999). Todavia, extratores como o Mehlich-1, amplamente difundido no Brasil, têm recebido várias críticas em razão da solubilização de formas não-lábeis de P como o P-Ca, superestimando os valores de P disponível em solos adubados com fosfatos naturais e naqueles que pela gênese apresentam teor elevado de P-Ca.…”
Section: Introductionunclassified