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Eighteen pan lysimeters were installed at a depth of 1.2 m in a Hagerstown silt loam soil in a corn field in central Pennsylvania in 1988. In 1995, wick lysimeters were also installed at 1.2 m depth… (More)
Abstract A soil test for nitrogen availabilty to corn (Zea mays, L) has gained wide acceptance in the northeast region of the United States. The test involves sampling the surface 30 cm of soil… (More)
The impacts of agriculture on water quality are receiving a high level of public attention. For example, the U. S. Environmental Protection Agency recently concluded that agriculture is the leading… (More)
Most N testing methods require collecting, processing and analyzing of either soil or plant tissue samples. In 1987 we began a study to determine if chlorophyll readings of maize (Zea mays L.) made… (More)