Effects of repeated manure and fertilizer phosphorus additions on soil phosphorus dynamics under a soybean-wheat rotation

Soil P availability and efficiency of applied P may be improved through an understanding of soil P dynamics in relation to management practices in a cropping system. Our objectives in this study were to evaluate changes in plant-available (Olsen) P and in different inorganic P (P(i)) and organic P (...

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Bibliographic Details
Published in:Biology and fertility of soils 1999-01, Vol.28 (2), p.150-155
Main Authors: Damodar Reddy, D, Subba Rao, A, Takkar, P.N
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
animal manures
Biological and medical sciences
crop production
crop rotation
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Glycine max
Nitrogen, phosphorus, potassium fertilizations
nutrient availability
phosphorus
Phosphorus fertilization
phosphorus fertilizers
semiarid zones
soil chemistry
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Triticum aestivum
tropics
typic haplustert
Vertisols
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Summary:Soil P availability and efficiency of applied P may be improved through an understanding of soil P dynamics in relation to management practices in a cropping system. Our objectives in this study were to evaluate changes in plant-available (Olsen) P and in different inorganic P (P(i)) and organic P (P(0)) fractions in soil as related to repeated additions of manure and fertilizer P under a soybean-wheat rotation. A field experiment on a Typic Haplustert was conducted from 1992 to 1995 wherein the annual treatments included four rates of fertilizer P (0, 11, 22 and 44 kg ha-1 applied to both soybean and wheat) in the absence and presence of 16 t ha-1 of manure (applied to soybean only). With regular application of fertilizer P to each crop the level of Olsen P increased significantly and linearly through the years in both manured and unmanured plots. The mean P balance required to raise Olsen P by 1 mg kg-1 was 17.9 kg ha-1 of fertilizer P in unmanured plots and 5.6 kg ha-1 of manure plus fertilizer P in manured plots. The relative sizes of labile [NaH-CO3-extractable P(i) (NaHCO3-P(i)) and NaHCO3-extractable P(0) (NaHCO3-P(0))], moderately labile (NaOH-extractable P(i) (NaOH-P(i)) and NaOH-extractable P(0) (NaOH-P(0)] and stable [HCl-extractable P (HCl-P) and H2SO4/H2O2-extractable P (residual-P)] P pools were in a 1:2.9:7.6 ratio. Application of fertilizer P and manure significantly increased NaHCO3-P(i) and -P(0) and NaOH-P(i) and -P(0) fractions and also total P. However, HCl-P and residual-P were not affected. The changes in NaH- CO3-P(i), NaOH-P(i) and NaOH-P(0) fractions were significantly correlated with the apparent P balance and were thought to represent biologically dynamic soil P and act as major sources and sinks of plant-available P.
ISSN:0178-2762
1432-0789
DOI:10.1007/s003740050477