Please use this identifier to cite or link to this item: http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/4491
Title: Total and Available Phosphorus Concentrations in Major Rice Growing Soils and Their Relationships with Rice Grain Phosphorus Concentration
Authors: Neththasinghe, N.A.S.A.
Madushan, N.D.R.
Ekanayake, E.M.S.
Rathnayake, W.M.U.K.
Sirisena, D.N.
Suriyagoda, L.D.B.
Keywords: Available phosphorous;Paddy;Soil categories;Total phosphorus
Issue Date: 2021
Publisher: University of Jaffna
Abstract: Phosphorus (P) is an essential macro nutrient for plant growth and development. Soil P exists in organic and inorganic forms. However, only a fraction of soil P is readily available to plant. Plant available and total P concentrations in soils vary among soil types due to the differences in soil mineralogy, structure, physical & chemical properties, and fertilizer application. Therefore, this research was conducted to estimate the concentrations of plant available and total P in major rice growing soils (i.e. 18 soil types) in Sri Lanka, and to study their relationships with grain P concentration. Total of 200 soil samples and grain samples were collected representing paddy lands across the country using a stratified random sampling approach. Available P (Olsen-P) and total P in soils, and grain P concentrations were measured. Available P concentration in paddy soil samples ranged from 5.4-76.9 mg kg−1. The highest available P concentration was recorded in Reddish Brown Earths & Immature Brown Loams soil (RBE_IBL) (34 mg kg−1) and the lowest in Red-Yellow Latosols soil (RYL) (12 mg kg−1). Soil total P concentration had a wide range of values i.e., 142-5685 mg kg−1. The Red-Yellow Podzolic soils with soft or hard laterite (RYP) had the highest soil total P concentration (2525 mg kg−1). Grumusol soil and RYL soil reported the lowest total P, i.e., < 1000 mg kg-1. Grain P concentration varied among soil types and it ranged between 0.6-1.8 mg g-1. However, there was no correlation between the grain and soil P concentrations. This information would be important for sustainable P-nutrient management in Sri Lankan rice soils.
URI: http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/4491
ISSN: 2465-6143
Appears in Collections:ICDA 2021



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