Adubação do milho: XV - Ensaios com diversos fosfatos (1. ª série)

Viégas, G. P.; Freire, E. S.; Venturini, W. R.

doi:10.1590/s0006-87051960000100058

Cited by 10 publications

(1 citation statement)

References 2 publications

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“…Studies in Brazil have shown that P from Araxa rock phosphate is much less available than P from superphosphate when equal amounts of P are applied (Malavolta et al, 1953;Viegas et al, 1960). This n:sult would be expected because of the low citric acid solubility of Araxa rock phosphate.…”

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confidence: 99%

Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus¹

Yost¹,

Naderman²,

Kamprath³

et al. 1982

Agronomy Journal

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As agricultural development intensifies in tropical countries and as costs of superphosphate production increase, the need for further evaluation of rock phosphates has become apparent. An acid tolerant pasture grass (Brachiaria decumbens Stapf.) was used to evaluate the initial and residual (3 years) availability of P from several phosphate materials. A field study was conducted on a Typic Haplustox of the Cerrado of Central Brazil. Initial availability of P supplied as normal superphosphate, Hyperphosphate, Thermalphosphate, and North Carolina rock phosphate was similar when the soils were not limed (pH = 4.3, Al = 1.4 meq/100g). Where lime had been added and pH was increased to 5.4 the P in Hyperphosphate and N.C. rock phosphate was initially less available than P added as superphosphate and Thermalphosphate. After 10 months of contact, lime no longer significantly depressed P availability in these relatively soluble rock phosphates as measured by forage dry weight. The P in the other phosphate rock of low citric acid solubility, Araxá, was virtually unavailable during the 3 months after application. However, within 13 months, maximum forage yields were attained where this material had been applied to unlimed soil and at 25 months maximum yields were obtained on both limed and unlimed soil. Higher rates of Araxá material were required to obtain maximum yields than with normal superphosphate. Forage yields were 2 to 4 times greater where superphosphate was surface applied each year than where similar amounts were incorporated prior to planting. A comparison of extractant methods for soil P indicated that highly acidic extractants (e.g., 0.05 N HC1 + 0.025 N H2SO4) overestimated available P where rock phosphate had been applied. Where superphosphate or rock phosphate had been applied, P availability was better assessed by extractants such as 0.5 M NaHCO3 and Bray 1. The results emphasize the need to supplement laboratory and short‐term studies with long‐term evaluations of P materials with acid tolerant perennial crop species available in tropical countries.

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Section: -------------------mentioning

confidence: 99%

Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus¹

Yost¹,

Naderman²,

Kamprath³

et al. 1982

Agronomy Journal

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Adubação do milho: XVI - Ensaios com diversos fosfatos (2.ª série)

Viécas¹,

Freire²,

Venturini

1960

Bragantia

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Continuando a publicação dos resultados obtidos em ensaios de adubação do milho com diversos fosfatos, os autores relatam três que foram conduzidos, sempre nos mesmos canteiros, de 1941-42 a 1944-45. Um dêles foi instalado em solo arenito Bauru, na Estação Experimental de Pindorama; os outros dois. em terra-roxa-misturada, nas Estações Experimentais de Tatuí e Limeira. No ensaio de Limeira, numa área muito deficiente de Fósforo, farinha de ossos se mostrou inferior a superfosfato, e, apatita de Ipanema, muito inferior a qualquer dos outros adubos; nos de Tatuí e Pindorama, conduzidos em solos que só no útlimo ano responderam moderadamente à adição de fósforo, os fosfatos estudados tiveram efeitos equivalentes.

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Adubação do milho: XVII - Ensaios com diversos fosfatos (3.0 série)

Viégas¹,

Smith²,

Freire

1961

Bragantia

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No presente artigo são apresentados, em prosseguimento ao estudo da eficiência de vários fosfalos para a cultura do milho, os resultados obtidos em mais três ensaios: um realizado em 1945-46, cm Ribeirão Prêto; outro, de 1947-48 a 1949-50, em Engenheiro Hermilo; e o terceiro, de 1947-48 a 1950-51, em Ipanema. No ensaio de Ribeirão Prêto, conduzido nos canteiros que serviram por alguns anos para idêntica experiência com algodão, a resposta ao fósforo foi nula c não houve diferença entre super tos fato, Serranafosfato, Cibrafosfato e farinha de ossos degelatinados. Nos de Engenheiro Hermilo e Ipanema, nos quais o efeito do fósforo foi enorme, Serranafosfato, farinha de ossos degelatinados e fosfato argeliano mostraram-se menos eficientes que superfosfato. Enquanto o primeiro ensaio foi instalado em terra-roxa-legilima, os outros dois o foram em solos arenosos, claros, do Glacial. Todavia, parece que a eficiência relativa dos fosfatos em estudo não dependeu essencialmente do tipo de solo, mas sobretudo da maior nu menor necessidade de fósforo nas áreas utilizadas para os ensaios.

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Adubação do milho: XV - Ensaios com diversos fosfatos (1. ª série)

Cited by 10 publications

References 2 publications

Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus¹

Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus¹

Adubação do milho: XVI - Ensaios com diversos fosfatos (2.ª série)

Adubação do milho: XVII - Ensaios com diversos fosfatos (3.0 série)

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Adubação do milho: XV - Ensaios com diversos fosfatos (1. ª série)

Cited by 10 publications

References 2 publications

Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus1

Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus1

Adubação do milho: XVI - Ensaios com diversos fosfatos (2.ª série)

Adubação do milho: XVII - Ensaios com diversos fosfatos (3.0 série)

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Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus¹

Availability of Rock Phosphate as Measured by an Acid Tolerant Pasture Grass and Extractable Phosphorus¹