Data/hora: 22/06/2024 06:46:35

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 24/08/1995
Data da última atualização: | 24/08/1995
Autoria: | VERMA, B. C.; SWAMINATHAN, K.
Título: | A comparison between biological and chemical methods for the estimation of plant available phosphorus in soils.
Ano de publicação: | 1978
Fonte/Imprenta: | Journal of the Indian Society of Soil Science, v.26, n.2, p.179-186, 1978.
Idioma: | Inglês

Conteúdo:

The efficiencies with which biological and chemical methods estimate plant available
phosphorus in eight Indian soils were compared. Biological methods were in general better
predictors than chemical ones, when the absolute yield of potato of the control treatment 
was adopted as the criterion and among them the cunninghamella plaque technique had
the highest reability, followed by the biological slope-ratio method and the L value techni-
que. But the per cent yield criterion was useful preferably with soil chemistry tests, of 
which only Schofield's mono-calcium phosphate potential could predict reliably the phos-
phorus availability status in these soils. On compressing the widely divergent test values
by a log-transformation, Spurway's test turned out to be extremely efficient as a predictor.
With the simultaneous use of phosphate potential and the log-transformed Spurway test
value as conjoint predictors, an R2 value of 0.92 was obtained, which thereby improved
the value of soil tests as predictors of plant available phosphorus. It is that this approach
takes into account the Q/I ratio as mesure of soil P availability.

Palavras-Chave: | Criteria biological methods; Metodo biologico; Multiple-predictor technique; Plant available phosphorus; Predictor.
Thesagro: | Fertilidade; Fósforo; Planta; Solo.
Thesaurus Nal: | soil.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (29383-1) - ADD - SP - -- - SP1003 -  - 1003 - DIS