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7231. Veseth, R.. 1987. Variable fertilizer application improves profits and conservation.. STEEP Conservation Farming Update, Spring 1989, p. 7.
This is a report on work being undertaken by Dr. David Malla, of WSU. Mulla proposes that soil, water and fertilizer resources can be used most efficiently with a variable fertilizer management strategy matched to spatially variable crop yield potentials within the field. Extensive testing was done at two sites. Mean yields with variable fertilizer were slightly greater than those with the uniform rates. However, significantly lower fertilizer inputs were used with the variable rates, costing $14 less per acre. The work shows that potential yields are related to landscape position. T:Graphs of available soil water, estimated winter wheat yield, phosphorus, nitrogen, and organic matter are shown in relation to topographic position across a sharply rolling field.