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Full-Text Articles in Physical Sciences and Mathematics
Potassium Mineralogy Of Kentucky Soils, Anastasios D. Karathanasis
Potassium Mineralogy Of Kentucky Soils, Anastasios D. Karathanasis
Soil Science News and Views
Feldspars and mica minerals are the two primary natural sources of potassium for most agricultural soils in Kentucky. Potassium feldspars are common mineral constituents of loess deposits in western Kentucky. Mica minerals, although dominant in shales, are also found in variable quantities in siltstone, sandstone and limestone parent materials of soils in the other regions of Kentucky. Because most of the soils in the western Coalfields and western Pennyroyal, and to a lesser extent in eastern Pennyroyal and Bluegrass, are covered by a loess cap of variable thickness, their surface mineralogy has been influenced by the feldspar-rich mineralogy of the …
Using Residual Soil Fertility Effectively, Grant W. Thomas
Using Residual Soil Fertility Effectively, Grant W. Thomas
Soil Science News and Views
During the past 30 years, the use of commercial fertilizer in Kentucky has resulted in increases in the levels of phosphorus and potassium in soils. As might be expected, the soil test levels are higher with tobacco than with any other crop. but all soils for all crops show increases in fertility levels. Comparisons between 1975 and 1985 (the latest year available) show the proportion of samples sent to the University of Kentucky that are medium or high in soil test phosphorus has increased considerably. Even more striking is the decrease in very low values of phosphorus.
Control Measures For Manganese Toxicity Of Burley At Transplating Time, Kenneth L. Wells, J. L. Sims
Control Measures For Manganese Toxicity Of Burley At Transplating Time, Kenneth L. Wells, J. L. Sims
Soil Science News and Views
Manganese (Mn) toxicity of burley tobacco is viewed by tobacco specialists in Kentucky as the greatest single factor which reduces yields. Estimates are that this problem adds 30 to 50 million dollars to the cost of burley production because of the greater acreage (and all associated costs) required by growers to produce their allotment. And, even though the cause and cure of Mn toxicity has been known for about 50 years, many growers are caught each year at transplanting time with no knowledge as to whether Mn toxicity may be a problem in their fields. The solution to Mn toxicity …
Reversible Tile Subsurface Drainage And Irrigation, Monroe Rasnake, Lloyd W. Murdock
Reversible Tile Subsurface Drainage And Irrigation, Monroe Rasnake, Lloyd W. Murdock
Soil Science News and Views
There are more than 900.000 acres of cl ass IIw land and 800,000 acres of class IIIw land in Kentucky. All of this land is suitable for row crop farming if it can be drained. Most of the problems are with internal drainage, some of which can be improved by installing drainage title.
Acid Rain: A Problem On Agronomic Crops And Soils In Kentucky??, John H. Grove
Acid Rain: A Problem On Agronomic Crops And Soils In Kentucky??, John H. Grove
Soil Science News and Views
Although the general issue of atmospheric pollution is complex, the image of beautiful lakes without aquatic life has focussed public attention on the acidity, or pH, of rainfall. Kentucky does receive acid rain (see map). This discussion will seek to define atmospheric acidity and its deposition and describe reported effects on agronomic crops and soils.