Abstract
Abstract Ladino clover, smooth brome grass. Kentucky bluegrass and bentgrass were grown in greenhouse pots to determine the relative uptake of K by the species when grown separately, and to study the competition for K when Ladino clover was grown in association with each of the three grasses. This was to determine to what extent the theory of differential cation uptake by plants of different root cation exchange capacity can explain the disappearance of legumes from pasture mixtures as a result of plant competition for K. Potassium uptake by plant species at low levels of soil K was closely correlated with root cation exchange capacity. The relative K compatibility was smooth brome (best). Kentucky blue (intermediate) and bentgrass (poorest). Because of the strong attraction and high uptake of K by roots of bentgrass, it was impossible with practical rates of K fertilization to maintain an adequate K supply for the associated Ladino clover.
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Claims 5
Claim · model-written summary
Potassium uptake by plant species at low soil K was closely correlated with root cation exchange capacity.
Verbatim
e1“Potassium uptake by plant species at low levels of soil K was closely correlated with root cation exchange capacity”
Claim · model-written summary
Smooth brome had the best relative K compatibility of the species compared.
Verbatim
e2“The relative K compatibility was smooth brome (best)”
Claim · model-written summary
Kentucky bluegrass had intermediate relative K compatibility.
Verbatim
e0“The relative K compatibility was smooth brome (best). Kentucky blue (intermediate)”
Claim · model-written summary
Bentgrass had the poorest relative K compatibility.
Verbatim
e0“The relative K compatibility was smooth brome (best). Kentucky blue (intermediate) and bentgrass (poorest)”
Claim · model-written summary
Because bentgrass took up K strongly, practical K fertilization rates could not maintain an adequate K supply for the associated Ladino clover.
Verbatim
e1“Because of the strong attraction and high uptake of K by roots of bentgrass, it was impossible with practical rates of K fertilization to maintain an adequate K supply for the associated Ladino clover”