Potassium release characteristics and mineralogical characteristics of some delaware soils

Publisher Website
Google Scholar
Abstract
Agriculturally important Delaware [USA] soils (28) were cropped intensively in a greenhouse experiment. There was no consistent positive correlation between K uptake and percent sand, silt, clay, clay minerals of the clay fraction, K-feldspars of the sand fraction or K-feldspar weathering of the soils from the A horizon. Only K-feldspar from the sand fraction and K-feldspar weathering correlated with K uptake in the soils of the B horizon. This correlation was only significant at the latter part of the experiment when nonexchangeable K was probably the source of plant available K.