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Fates and Losses of Nitrogen from a Nitrogen-15-Labeled Cover Crop in an Intensively Managed Vegetable System

Dep. of Vegetable Crops, One Shields Ave., Univ. of California, Davis, CA 95616 USA

View larger version (28K): [in a new window]   Fig. 1 Temporal changes in N pools (g N m-2 at 0–60 cm depth) and the amount of N derived from the fresh residue of Phacelia tanacetifolia, based on 15N accumulation in the soil pools. (a) NH+4–N, (b) NO-3–N, and (c) Microbial biomass N (MBN). Data are shown from prior to addition of cover crop residue until harvest of lettuce 4 mo later. Means ± SE. Lowercase letters indicate mean separations. Note the difference in the magnitude of the y axis among graphs

View larger version (20K): [in a new window]   Fig. 2 Changes in soil microbial biomass C (MBC, g C m-2 at 0–30 cm depth) during the first 4 mo after incorporation of fresh cover crop residue. Means ± SE. Lowercase letters indicate mean separations

View larger version (17K): [in a new window]   Fig. 3 Leaching of NO-3–N as indicated by accumulation of NO-3–N in ion exchange resin bags at the 60-cm depth in the soil profile during the first 4 mo after incorporation of fresh cover crop residue. The percentage of N derived from Phacelia tanacetifolia residue is also shown. Means ± SE. Lowercase letters indicate mean separations. See Fig. 1a for the dates of agricultural management practices

View larger version (17K): [in a new window]   Fig. 4 Recovery of 15N in total soil N (including NH+4–N, NO-3–N, microbial biomass N, soil organic N, and residue fragments) from the 15N-labeled residue of Phacelia tanacetifolia in the 0- to 30-cm soil depth during 1 yr after incorporation of fresh cover crop residue. Means ± SE. Lowercase letters indicate mean separations

View larger version (55K): [in a new window]   Fig. 5 Proportion of the added 15N in Phacelia tanacetifolia residue that was recovered in different plant and soil components at harvest of the first lettuce crop, which was 4 mo after residue incorporation. Means ± SE