Effect of soil characteristics and potassium application rate on the plant-absorbable potassium forms and transport mechanisms in soil

Minako Yoshida, Yuki Mori, Shin-Ichiro Wada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Although the demand for saving potassium (K) fertilizer application is increasing, the evaluation of available K by exchangeable K that is operationally defined as 1 M ammonium acetate-extractable K has limitations. In order to investigate the contribution of soil K forms and transport mechanisms for K uptake, pot experiment was performed using two soils with varying K application rate. The spinach grown in vermicu-lite-rich soil absorbed considerable amount of K from nonexchangeable fraction and the transport mechanism was mainly by diffusion, whereas the plant cultivated in volcanic ash soil, which contain less vermiculite, mostly absorbed exchangeable K and the contribution of mass flow was substantially high. Exchangeable K and soil solution K in vermiculite-rich soil did not much increased at the high rate of K application. A part of applied K might become readily absorbable- nonexchangeable K. To evaluate K supplying capacity of soil, it is necessary to quantify not only exchangeable K but also the K fixation and the amount of K released from nonexchangeable sites. In soil whose K fixation capacity is low, the transport of K from soil might be modeled by solute transport and cation exchange.

Original languageEnglish
Pages (from-to)485-488
Number of pages4
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume57
Issue number2
Publication statusPublished - Sep 1 2012

Fingerprint

application rate
Potassium
Soil
potassium
soil
vermiculite
volcanic ash soils
Volcanic Eruptions
ammonium acetate
soil transport processes
mass flow
cation exchange
soil solution
spinach
Spinacia oleracea
Fertilizers
fertilizer application
Cations

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

Cite this

Effect of soil characteristics and potassium application rate on the plant-absorbable potassium forms and transport mechanisms in soil. / Yoshida, Minako; Mori, Yuki; Wada, Shin-Ichiro.

In: Journal of the Faculty of Agriculture, Kyushu University, Vol. 57, No. 2, 01.09.2012, p. 485-488.

Research output: Contribution to journalArticle

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