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Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657

Rev. Bras. Ciênc. Solo vol.21 no.4 Viçosa Oct./Dec. 1997

http://dx.doi.org/10.1590/S0100-06831997000400012 

SEÇÃO IV - FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS

 

Phosphorus availability in soils amended with organic materials, estimated by three chemical methods and two enzyme activities(1)

 

Disponibilidade de fósforo estimada por três métodos químicos e pela atividade de duas enzimas em solos que receberam incorporação de materiais orgânicos

 

 

R. S. BertonI; P. F. PrattII; W. T. Frankenberger Jr.II

IResearcher of IAC - Seção de Fertilidade do Solo e Nutrição de Plantas, Instituto Agronômico. Caixa Postal 28 CEP 13010-970 Campinas (SP) Brazil
IIProfessor, Department of Soil and Environmental Sciences, University of California, Riverside, CA, USA

 

 


SUMMARY

Phosphorus availability in samples of Aquatibia (Typic xerofluvent) and Hoda (Ultic haploxeralf) soils incubated with increasing amounts of organic materials (barley straw, cowpea plant tops, dairy manure and sewage sludge) was estimated by different chemical methods and by measuring the activity of the enzymes acid phosphatase and phosphodiesterase, at the Department of Soils and Environmental Sciences of the University of California/Riverside, from January to November of 1985. In a greenhouse study, yield of dry matter and P uptake by corn plants cultivated in the soil samples with the same organic materials were measured. Water extraction method correlated significantly with P uptake only when dairy manure and sewage sludge were added to Aquatibia and Hoda soils, respectively. The anion-exchange resin and the Mehlich 1 methods were suitable for measuring the P availability to plants when soils received increasing amounts of organic residues, as in both cases this variable was highly correlated with the yield of dry matter and the amount of P uptaken. The high amounts of P extracted by the anion-exchange resin procedure from the soil with high P sorption capacity indicated that this method not only took into account the intensity factor but also gave a better estimate of the capacity factor. Soil phosphodiesterase activity revealed to be a good index for estimating the P availability to the plant when both soils were amended with cowpea plant tops and dairy manure.

Index terms: phosphorus availability, chemical extraction methods, enzime activity, sewage sludge, organic fertilizers, maize.


RESUMO

A disponibilidade de fósforo em amostras dos solos Aquatibia (solo aluvial) e Hoda (podzólico vermelho-amarelo eutrófico), incubados com quantidades crescentes de materiais orgânicos (palha de cevada, parte aérea de feijão-caupi, esterco de curral e lodo de esgoto), foi estimada por três métodos químicos e pela atividade das enzimas fosfatase ácida e fosfodiesterase, no Departamento de Ciências do Solo e Ambientais da Universidade da Califórnia/Riverside, de janeiro a novembro de 1985. Em estudo em casa de vegetação, a produção de matéria seca e a quantidade de P absorvida pela parte aérea de plantas de milho cultivadas nos solos que receberam os mesmos materiais orgânicos foram determinadas. A disponibilidade de P medida pela extração com água correlacionou-se, significativamente, apenas quando o esterco de curral e o lodo de esgoto foram adicionados aos solos Aquatibia e Hoda, respectivamente. A resina de troca aniônica e o Mehlich 1 foram os métodos mais indicados para determinar a disponibilidade de P para o milho quando os solos receberam quantidades crescentes dos materiais orgânicos. As altas quantidades de P extraídas pela resina de troca aniônica do solo com alta capacidade de adsorção de P indicaram que esse método foi o que melhor considerou os fatores intensidade e capacidade do solo. A atividade da enzima fosfodiesterase do solo revelou ser um bom índice para a determinação do P disponível para o milho, quando os solos receberam a adição do feijão-caupi e do esterco de curral.

Termos de indexação: disponibilidade de fósforo, métodos químicos de extração, atividade enzimática, lodo de esgoto, adubação orgânica, milho.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

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Received for publication in april 1995
Approved in october 1997

 

 

(1) Part of first author's Ph.D. thesis, University of California, Riverside, CA, USA.

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