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Ryegrass Cover Crop Effects on Nitrate Leaching in Spring Barley Fertilized with ¹⁵NH₄¹⁵NO₃

^a Dep. of Soil Science, Swedish Univ. of Agric. Sci., P.O. Box 7072, S-75007 Uppsala, Sweden
^b Dep. of Plant and Soil Science, Univ. of Vermont, Burlington, VT 05405-0082

View larger version (33K): [in a new window]   Fig. 1. Effect of spring-seeded (1992) ryegrass cover crop (incorporated in May 1993) on cumulative leachate from the lysimeters; and monthly precipitation (plus irrigation) amounts during the study period.

View larger version (18K): [in a new window]   Fig. 2. Concentrations of NO3–N in lysimeter leachate during the period October 1992–April 1994, as affected by a spring-seeded (1992) ryegrass cover crop (incorporated in May 1993). Statistical differences are indicated by ** (0.01), * (0.05), and + (0.10). NS = not significant. Data points without symbols had only one sample for one of the treatments.

View larger version (14K): [in a new window]   Fig. 3. Cumulative NO3–N leached from lysimeters with and without a cover crop during the period October 1992–April 1994.

View larger version (40K): [in a new window]   Fig. 4. Effect of spring-seeded (1992) ryegrass cover crop (incorporated in May 1993) on NO3–N concentrations in soil solution on 10 sampling dates during the study.

View larger version (22K): [in a new window]   Fig. 5. Effect of spring-seeded (1992) ryegrass cover crop (incorporated in May 1993) on soil NO3–N concentrations at various depths in May 1993 and 1994, including standard error bars.

View larger version (45K): [in a new window]   Fig. 6. Total fertilizer-derived N in various depths of the soil profile in May 1993 and 1994, as affected by the presence of a spring-seeded (1992) ryegrass cover crop (incorporated in May 1993). Bars represent standard error. Note that the top three depths represent smaller increments.