Phosphorus fractions in an acid soil continuously fertilized with mineral and organic fertilizers

• Published in: Biology and fertility of soils 2005-05, Vol.41 (4), p.295-300
• Main Authors: VERMA, S, SUBEHIA, S. K, SHARMA, S. P
• Format: Article
• Language: English
• Subjects: Acidic soils; Agronomy. Soil science and plant productions; Animal manures; Biological and medical sciences; Fertilizer application; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Generalities. Analysis and diagnosis methods; Mineral fertilizers; Organic fertilizers; Organic phosphorus; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; Plant extracts; Sodium hydroxide; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Soils
• ISSN: 0178-2762; 1432-0789
• DOI: 10.1007/s00374-004-0810-y

The effect of different treatments on the fate of applied P was investigated in a long-term field experiment started in 1972-1973 following a maize-wheat sequence. The soil samples were collected after 29 years of continuous addition of mineral fertilizers and amendments such as farmyard manure (FYM) and lime. The total P content of all the treatments increased compared to the original soil; NaOH-inorganic P (P^sub i^) (NaOH-P^sub i^) representing Fe and Al-bound P was the dominant P^sub i^ fraction. At the beginning of the experiment (1972-1973), the various P pools could be quantitatively ranked in the following order: residual P>NaOH-organic P (P^sub o^)>NaOH-P^sub i^>NaHCO^sub 3^-P^sub o^>NaHCO^sub 3^-P^sub i^>HCl-P>H^sub 2^O-P. As a result of continued P fertilization and cropping, the order changed as follows: residual P>NaOH-P^sub i^>NaOH-P^sub o^>NaHCO^sub 3^-P^sub i^>NaHCO^sub 3^-P^sub o^>HCl-P>H^sub 2^O-P. Compared to the imbalanced mineral fertilizer application, the balanced as well as integrated application of nutrients resulted in significantly lower P adsorption capacity of soils. The Olsen extractable-P fraction (plant-available P) increased from about 12 mg kg^sup -1^ soil in 1972 to about 81 mg kg^sup -1^ soil in the treatments receiving P for the last 29 years.[PUBLICATION ABSTRACT]