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dc.contributor.authorPortela, Esterpt_PT
dc.date.accessioned2018-09-07T09:58:54Z-
dc.date.available2018-09-07T09:58:54Z-
dc.date.issued1993-
dc.identifier.urihttp://hdl.handle.net/10348/8706-
dc.description.abstractIn Portugal, the response to K application is often inconsistent with the Egner-Riehm values for available K. This is partly related to high K reserves of some soils. Twenty surface soils representative of different parent materials from NE Portugal were studied to determine their K supplying capacity. Continuous cropping with perennial ryegrass permitted the assessment of the relative ability of soils to release non-exchangeable K. Soils were classified in the range of available K from medium to very high. However, their ability to supply K in the short and long term are very different. In some soils K status measured by plant growth does not fall appreciably, whilst others are rapidly exhausted, and 30% of them are very deficient in K. The supplying capacity varied both with the nature of the parent material and the degree of weathering. The soils deficient in K are those derived from basic rocks and those with more weathered clay minerals. This is the case of the soils with the largest content of organic matter where the dominant clay minerals were kaolinite and vermiculite. Soils that have the highest capacity for supplying K are highly micaceous, like those developed from mica schists, phyllites or river alluvium. In fact the amount of K released from non-exchangeable form is well correlated with the amount of illite in the clay fraction. Soil types and K buffer power coupled with available K must be taken into account when planning any application of K.pt_PT
dc.language.isoengpt_PT
dc.rightsopenAccesspt_PT
dc.subjectillitept_PT
dc.subjectK releasept_PT
dc.subjectK reservept_PT
dc.subjectK uptakept_PT
dc.subjectmicapt_PT
dc.subjectnon-exchangeable Kpt_PT
dc.subjectpotassiumpt_PT
dc.subjectryegrasspt_PT
dc.titlePotassium supplying capacity of northeastern Portuguese soilspt_PT
dc.typearticlept_PT
degois.publication.firstPage13pt_PT
degois.publication.lastPage20pt_PT
degois.publication.titlePlant and Soilpt_PT
degois.publication.volume154pt_PT
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