Nutrient potential and capacity ii relationship between potassium potential and buffering capacity and the supply of potassium to plants

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The potassium status of 22 soils with low reserves of non-exchangeable potassium was assessed by measuring: (a) the potassium potential (the free energy of exchange of potassium for calcium plus magnesium); (b) the soil’s capacity to resist a change in potential (“buffering capacity”); (c) the amount of exchangeable potassium and its percentage saturation. The ability of these measures to predict the supply of potassium was tested by growing subterranean clover (Trifolium subterraneum L.) in pots and determining its potassium content at successive harvests. The soil’s buffering capacity was found to affect the supply of potassium even when uptake was small. It is suggested that this was partly because buffering capacity affects the rate of supply by diffusion to plant roots. As the uptake of potassium became progressively larger, the potential became increasingly unsuitable as a single index of availability, but a multiple regression containing terms for potential and for buffering capacity continued to account for a large proportion (89%) of the variation. The relationship obtained can be used to indicate the amount of potassium required to bring a deficient soil to a desirable status.

Original languageEnglish
Pages (from-to)849-861
Number of pages13
JournalAustralian Journal of Agricultural Research
Volume17
Issue number6
DOIs
Publication statusPublished - 1 Jan 1966

Fingerprint

buffering capacity
Potassium
potassium
Food
nutrients
Soil
Trifolium subterraneum
soil
exchangeable potassium
uptake mechanisms
Trifolium
Medicago
Plant Roots
energy transfer
Magnesium
magnesium
calcium
Calcium

Cite this

@article{677c2a31fce64cf79f5b2cc496c4c8b2,
title = "Nutrient potential and capacity ii relationship between potassium potential and buffering capacity and the supply of potassium to plants",
abstract = "The potassium status of 22 soils with low reserves of non-exchangeable potassium was assessed by measuring: (a) the potassium potential (the free energy of exchange of potassium for calcium plus magnesium); (b) the soil’s capacity to resist a change in potential (“buffering capacity”); (c) the amount of exchangeable potassium and its percentage saturation. The ability of these measures to predict the supply of potassium was tested by growing subterranean clover (Trifolium subterraneum L.) in pots and determining its potassium content at successive harvests. The soil’s buffering capacity was found to affect the supply of potassium even when uptake was small. It is suggested that this was partly because buffering capacity affects the rate of supply by diffusion to plant roots. As the uptake of potassium became progressively larger, the potential became increasingly unsuitable as a single index of availability, but a multiple regression containing terms for potential and for buffering capacity continued to account for a large proportion (89{\%}) of the variation. The relationship obtained can be used to indicate the amount of potassium required to bring a deficient soil to a desirable status.",
author = "Barrow, {N. J.}",
year = "1966",
month = "1",
day = "1",
doi = "10.1071/AR9660849",
language = "English",
volume = "17",
pages = "849--861",
journal = "Crop & Pasture Science",
issn = "1836-0947",
publisher = "CSIRO Publishing",
number = "6",

}

TY - JOUR

T1 - Nutrient potential and capacity ii relationship between potassium potential and buffering capacity and the supply of potassium to plants

AU - Barrow, N. J.

PY - 1966/1/1

Y1 - 1966/1/1

N2 - The potassium status of 22 soils with low reserves of non-exchangeable potassium was assessed by measuring: (a) the potassium potential (the free energy of exchange of potassium for calcium plus magnesium); (b) the soil’s capacity to resist a change in potential (“buffering capacity”); (c) the amount of exchangeable potassium and its percentage saturation. The ability of these measures to predict the supply of potassium was tested by growing subterranean clover (Trifolium subterraneum L.) in pots and determining its potassium content at successive harvests. The soil’s buffering capacity was found to affect the supply of potassium even when uptake was small. It is suggested that this was partly because buffering capacity affects the rate of supply by diffusion to plant roots. As the uptake of potassium became progressively larger, the potential became increasingly unsuitable as a single index of availability, but a multiple regression containing terms for potential and for buffering capacity continued to account for a large proportion (89%) of the variation. The relationship obtained can be used to indicate the amount of potassium required to bring a deficient soil to a desirable status.

AB - The potassium status of 22 soils with low reserves of non-exchangeable potassium was assessed by measuring: (a) the potassium potential (the free energy of exchange of potassium for calcium plus magnesium); (b) the soil’s capacity to resist a change in potential (“buffering capacity”); (c) the amount of exchangeable potassium and its percentage saturation. The ability of these measures to predict the supply of potassium was tested by growing subterranean clover (Trifolium subterraneum L.) in pots and determining its potassium content at successive harvests. The soil’s buffering capacity was found to affect the supply of potassium even when uptake was small. It is suggested that this was partly because buffering capacity affects the rate of supply by diffusion to plant roots. As the uptake of potassium became progressively larger, the potential became increasingly unsuitable as a single index of availability, but a multiple regression containing terms for potential and for buffering capacity continued to account for a large proportion (89%) of the variation. The relationship obtained can be used to indicate the amount of potassium required to bring a deficient soil to a desirable status.

UR - http://www.scopus.com/inward/record.url?scp=84970581825&partnerID=8YFLogxK

U2 - 10.1071/AR9660849

DO - 10.1071/AR9660849

M3 - Article

VL - 17

SP - 849

EP - 861

JO - Crop & Pasture Science

JF - Crop & Pasture Science

SN - 1836-0947

IS - 6

ER -