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Root Growth and Nitrate Uptake of Three Different Catch Crops in Deep Soil Layers

Danish Institute of Agricultural Sciences, Dep. of Horticulture, Kirstinebjergvej 10, DK-5792 Årslev, Denmark

View larger version (28K): [in a new window]   Fig. 1. Daily precipitation and temperature from sowing of catch crops on 8 August. The horizontal bar on the x-axis indicates the 6-d experimental period.

View larger version (18K): [in a new window]   Fig. 2. Subplot for 15N injection at 1-m depth. Due to the angle of 30° from vertical of the boring holes, the boring points on the soil surface (•) are placed outside the subplot for harvest of plant material, while the points of deep 15N placement () are situated right under the subplot. The numbers indicate distances in meters.

View larger version (18K): [in a new window]   Fig. 3. Average root depth development versus (a) date and (b) accumulated daily temperature including regression outputs, from sowing of catch crops on 8 August. In (a) the horizontal bar on the x-axis indicates the 6-d period of the 15N injection experiment and the error bars indicate standard errors (n = 4). In (b) the two last data points were deleted from the regression analysis for fodder radish due to root depth exceeding measuring depth of minirhizotrons.

View larger version (19K): [in a new window]   Fig. 4. Average (a) root intensity and (b) root frequency in the 0- to 2.42-m soil profile before the start of the 15N injection experiment; and (c) plant 15N uptake during the 6-d 15N injection experiment starting 25 October. Notice the break on the x-axis. Part (d) shows NO3 concentrations in the 0- to 2.5-m soil profile. The error bars indicate standard errors (n = 4).

View larger version (18K): [in a new window]   Fig. 5. Plant 15N uptake during the 6-d 15N injection experiment versus (a) root intensity and (b) root frequency in a 0.2-m soil layer surrounding each 15N injection point. Regression outputs are shown (n = 4).