Native soil and fresh fertilizer phosphorus uptake as affected by rate of application and P fertilizers

³²P labelled fertilizers were used to measure native soil and fresh fertilizer phosphorus uptake by Lolium perenne L. in greenhouse experiments. The P source evaluation was carried out for multiple rates of application for a standard P fertilizer (DAP) on low and medium soil P levels and for North C...

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Bibliographic Details
Published in:Plant and soil 1989-03, Vol.115 (1), p.123-128
Main Authors: Morel, C. (Cofaz Service Agronomique, Neuilly-sur-Seine (France)), Fardeau, J.C
Format: Article
Language:English
Subjects:
ABSORCION DE SUBSTANCIAS NUTRITIVAS
ABSORPTION DE SUBSTANCES NUTRITIVES
Acid soils
Agricultural site preparation
Agricultural soils
Agrology
Agronomy. Soil science and plant productions
Biological and medical sciences
ENGRAIS PHOSPHATE
FERTILIZANTES FOSFATADOS
Fertilizers
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Life Sciences
LOLIUM PERENNE
Nitrogen, phosphorus, potassium fertilizations
NUTRIENT UPTAKE
PHOSPHATE FERTILIZERS
PHOSPHATE NATUREL
Phosphates
Phosphorus
Phosphorus fertilization
Phosphorus fertilizers
ROCA FOSFATADA
ROCK PHOSPHATE
Soil nutrients
Soil water
Soil-plant relationships. Soil fertility. Fertilization. Amendments
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Summary:³²P labelled fertilizers were used to measure native soil and fresh fertilizer phosphorus uptake by Lolium perenne L. in greenhouse experiments. The P source evaluation was carried out for multiple rates of application for a standard P fertilizer (DAP) on low and medium soil P levels and for North Carolina rock phosphate (RP) at the medium soil P level only. At the low soil P level, the native P uptake increase was independent of P-DAP applied, and represented 19% of the nil P uptake. At the medium soil P level, the variability of the native soil as a nutrient P source depended on the phosphate fertilizer applied, and the rate of application. Consequently the amount of total P uptake could conceal differences in P fertilizer evaluations as the nutrient P source. Fresh P uptake increased linearly with the rates of P applied as standard or tested P fertilizer. The comparison of various P sources by means of fresh P uptake ratio (i.e. fresh P uptake from tested phosphate divided by fresh P uptake from standard phosphate) was independent of the rate of application. It was therefore suggested that various phosphorus sources be evaluated by measuring the fresh P uptake for a single rate of application.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF02220702