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Nitrogen Fertilizer Use Efficiency of Furrow-Irrigated Onion and Corn

^a USDA-ARS, P.O. Box E, Fort Collins, CO 80522
^b Colorado State Univ., Arkansas Valley Res. Cent., 27901 Road 21, Rocky Ford, CO 81067

View larger version (29K): [in a new window]   Fig. 1. Biomass production of tops as a function of day of year and bulbs as a function of day of year and N rate (+NF, N fertilizer applied; -NF, no N fertilizer applied).

View larger version (25K): [in a new window]   Fig. 2. Bulb fresh weight production as a function of sampling date and N fertilizer rate (+NF, N fertilizer applied; -NF, no N fertilizer applied).

View larger version (25K): [in a new window]   Fig. 3. Nitrogen concentration in onion tops and bulbs as a function of sampling date.

View larger version (32K): [in a new window]   Fig. 4. Nitrogen uptake in tops plus bulbs and in bulbs as a function of sampling date and N fertilization (+NF, N fertilizer applied; -NF, no N fertilizer applied). Significant N rate x date interactions are shown.

View larger version (22K): [in a new window]   Fig. 5. Distribution of residual 15N fertilizer in soil after onion harvest on 17 Sept. 1998 as a function of soil depth and soil sample location.