Leaching of applied phosphorus in container media

Marconi, D.; Nelson, Paul V.

doi:10.1016/0304-4238(84)90061-x

Cited by 56 publications

(36 citation statements)

References 4 publications

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“…In substrates with a higher buffer power P sol is held constantly at a low level, which reduces the risk of P leaching in outdoor cultivation and possible P toxicity, while guaranteeing an adequate P supply of the plants by replenishing the substrate solution ( Marconi and Nelson , 1984; Williams and Nelson , 2000; McDowell et al, 2001; Ogutu et al, 2009). Owen et al (2007) showed a reduction of P loss by leaching of 34% in a pine‐park substrate amended with a commercial bentonite compared to a control treatment without mineral amendment.…”

Section: Discussionmentioning

confidence: 99%

Phosphorus buffering capacity of substrate clays and its significance for plant cultivation

Binner

Dultz

2015

J. Plant Nutr. Soil Sci.

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Peat is commonly used as the main component of horticultural substrates, but it has a very low buffering capacity for the anionic macronutrient phosphorus (P), which can be increased by the addition of clays. The aim of this study was to characterize the P adsorption capacity of different substrate clays and to evaluate its significance for plant P uptake. Substrate clays were characterized with a single-point batch experiment and adsorption and desorption isotherms. The data were fitted to the Langmuir equation for a calculation of the maximum adsorption capacity. Additionally, the contents of oxalate extractable Fe and Al (SFe ox + Al ox ) were determined. The influence of a varying P adsorption capacity of the clays on the P availability to plants in the respective peat-clay substrates and pure peat was investigated in a growth experiment with Impatiens walleriana fertigated with 0, 17, and 35 mg P L -1 solution, respectively. The observed and calculated (Langmuir) P adsorption capacity of the clays could be well-characterized by both the batch experiment and the adsorption isotherms and was highly correlated with the SFe ox +Al ox . A higher P adsorption capacity of the clay amendment in mixed substrates resulted in a lower P concentration in the substrate solution, while the CAT extractable P concentration (P CAT ) was the same. Plant growth and shoot P concentrations were enhanced in the substrates, showing a higher P adsorption capacity, since plants were able to take up the whole amount of P CAT , and also part of the non-CAT extractable P. However, the release rate was too low to ensure optimal plant growth, which was in accordance with the result of the desorption experiment. The absolute extent of P release was increased with the increasing P adsorption capacity of the clays and higher degree of P saturation (DPS).

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Section: Discussionmentioning

confidence: 99%

Phosphorus buffering capacity of substrate clays and its significance for plant cultivation

Binner

Dultz

2015

J. Plant Nutr. Soil Sci.

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“…Essa relação inversa entre adsorção e lixiviação de P em substratos também foi constatada por Marconi & Nelson (1984) e Williams & Nelson (1996).…”

Section: Quadro 1 Análises (1) Dos Substratos Fibra De Coco (Fc) Plunclassified

“…Essa prática, quando bem utilizada, favorece o desenvolvimento da planta (Godoy & Cole, 2000), mas o uso de doses elevadas de P, além de ser antieconômico, pode causar riscos ao ambiente, devido ao carreamento desse nutriente pela água drenada, principalmente quando se utilizam fertilizantes solúveis de liberação rápida (Broschat, 1995;Godoy & Cole, 2000), elevada lâmina de água de irrigação (Ku & Hershey, 1997), substratos com baixa capacidade de adsorção de P (Yeager & Wright, 1982;Marconi & Nelson, 1984;Williams & Nelson, 1996) e plantas com taxas de enraizamento e de absorção de nutrientes lentas. Poder-se-ia pensar também que a macroporosidade alta de muitos substratos favoreceria a eluviação de partículas sólidas do fertilizante, fato não comprovado por Yeager & Barrett (1984) para fertilizantes solúveis.…”

Section: Introductionunclassified

Características químicas do lixiviado na fase de enraizamento de estacas de cacau em substratos adubados com fósforo

Júnior

Carmello

Faria³

2008

Rev. Bras. Ciênc. Solo

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“…The high loss of nutrients through leaching was probably due the limited nutrient retention capacity of the composted bark-based potting medium (Fox and Kamprath 1970, Marconi and Nelson 1984, Cole and Dole 1997, Huett 1997. Cole and Dole (1997) found that 47%…”

Section: Leaching and The Management Of P Nutritionmentioning

confidence: 99%