Influence of Application of Organic Residues of Different Biochemical Quality on Phosphorus Fractions in a Tropical Sandy Soil

Tanabhat-Sakorn Sukitprapanon,Nattaporn Prakongkep,Metawee Jantamenchai,Duangsamorn Tulaphitak,Robert John Gilkes,Patma Vityakon

doi:10.3390/agronomy11020248

Tanabhat-Sakorn Sukitprapanon, Nattaporn Prakongkep + Show 4 more

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https://doi.org/10.3390/agronomy11020248

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Journal: Agronomy	Publication Date: Jan 29, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Khon Kaen University

Abstract

Understanding phosphorus (P) dynamics in tropical sandy soil treated with organic residues of contrasting quality is crucial for P management using organic amendments. This research determined P fractions in a tropical sandy soil under the application of organic residues of different quality, including groundnut stover (GN), tamarind leaf litter (TM), dipterocarp leaf litter (DP), and rice straw (RS). The organic residues were applied at the rate of 10 t DM ha−1 year−1. The P fractions were examined by a sequential extraction procedure. Organic residue application, regardless of residue quality, resulted in P accumulation in soils. For unamended soil, 55% of total P was mainly associated with Al (hydr)oxides. Organic residue application, regardless of residue quality, diminished the NH4F-extractable P (Al-P) fraction, but it had a nonsignificant effect on NaOH-extractable P (Fe-P). The majority of Al-P and Fe-P fractions were associated with crystalline Al and Fe (hydr)oxides. NH4Cl-extractable P (labile P), NaHCO3-extractable P (exchangeable P and mineralizable organic P), HCl-extractable P (Ca-P), and residual P fractions in soil were significantly increased as a result of the incorporation of organic residues. The application of organic residues, particularly those high in ash alkalinity, increase soil pH, labile P, and Ca-P fractions. In contrast, applications of residues high in lignin and polyphenols increase residual P fraction, which is associated with organo-mineral complexes and clay mineral kaolinite.

Highlights

Sandy soils in the tropics are recognized to be infertile because of their high sand content (>85%), low soil pH, usually ranging from 4.0 to 5.5, low cation exchange capacity, low water-holding capacity, low soil organic matter, and low plant nutrient contents, phosphorus (P) [1,2]
This study indicates that the incorporation of organic residues, low-quality ones (i.e., rice straw (RS) and dipterocarp leaf litter (DP)), significantly increased the proportion of NaHCO3 -extractable P, which is mostly associated with exchangeable P and mineralizable organic P
This study determined the dynamics of P forms under the application of different quality organic residues

Summary

Introduction

Sandy soils in the tropics are recognized to be infertile because of their high sand content (>85%), low soil pH, usually ranging from 4.0 to 5.5, low cation exchange capacity, low water-holding capacity, low soil organic matter, and low plant nutrient contents, phosphorus (P) [1,2]. The P dynamics in soils are mainly associated with P adsorbed on soil constituents, such as clay minerals, aluminum (Al) and iron (Fe) (hydr)oxides, and soil organic matter [7,8,9,10]. Most P (50–75%) in mineral soils is mainly associated with Al and Fe (hydr)oxides in acidic soils and with calcium (Ca) in calcareous soils [12,13]

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