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A Soil Organic Nitrogen Fraction that Reduces the Need for Nitrogen Fertilization

^a Dep. of Natural Resources and Environ. Sci
^b Dep. of Crop Sci., Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
^c Growmark, 1701 Towanda Ave., Bloomington, IL 61701

View larger version (38K): [in a new window]   Fig. 1. Changes in hydrolyzable forms of soil N during incubation (25°C, 85–90% relative humidity) after treatment of 5-g soil samples (four replicates) with sufficient deionized water to achieve 60% of the soil's water-holding capacity. Samples incubated for 4, 8, or 12 wk were leached at biweekly intervals with 0.01 M CaCl2. Error bars representing one standard deviation above and below the mean are shown when they exceeded the size of the data marker.

View larger version (22K): [in a new window]   Fig. 2. Relationship between amino sugar N and percentage yield response to N fertilization for soils from 18 N-response sites. Values for N-fertilizer response were calculated as 100(optimum yield - check-plot yield)/check-plot yield, using yield data reported by Brown (1996). Values for amino sugar N were obtained as the mean of four determinations.