. Efficient use of nitrogen on crop land in the Northeast. Plants; Soils. Connecticut Agricultural Experiment Station Bulletin 792 Table 5. Table beet responses to N Yield Dry weight Total N Fertilizer ammonium nitrate roots (fresh wt.) Tops Roots Tops Roots Total Preplant* Sidedressed May 4 July 1 kg /ho 17000 21000 30000 28000 kg/ha kg N/ha kg N/ha O O o o o o o o 3500 4600 3700 5000 3400 3200 5500 4900 70 150 90 180 40 80 100 140 no 230 190 320 * Table beet seeds planted May 22. Roots harvested August 12. Data of Peck, New York State Agricultural Experiment Station, Geneva. soil derive
. Efficient use of nitrogen on crop land in the Northeast. Plants; Soils. Connecticut Agricultural Experiment Station Bulletin 792 Table 5. Table beet responses to N Yield Dry weight Total N Fertilizer ammonium nitrate roots (fresh wt.) Tops Roots Tops Roots Total Preplant* Sidedressed May 4 July 1 kg /ho 17000 21000 30000 28000 kg/ha kg N/ha kg N/ha O O o o o o o o 3500 4600 3700 5000 3400 3200 5500 4900 70 150 90 180 40 80 100 140 no 230 190 320 * Table beet seeds planted May 22. Roots harvested August 12. Data of Peck, New York State Agricultural Experiment Station, Geneva. soil derived from calcareous glacial drift, which had a cover crop of oats removed the previous year. As- suming that 110 kg N/ha came from the soil, an ap- plication of an additional 110 kg N/ha preplant was 70% taken up by the tops and enlarged portion of roots. Fertilizer N side-dressed early at 110 kg N/ha was nearly all taken up by the tops and roots. Fertilizer N applied preplant increased yields more than side-dressed N. Fertilizer N applied preplant in- creased the total yield, especially the yield of the large diameter roots. These large roots are of less value for processing than small roots. A large amount of N was returned to the soil in the tops since only the roots are removed from the field by mechanical harvesters. At the early harvest date, August 12, the table beet plants grown with only soil N plus preplant fertilizer N were approaching N deficiency. This made har- vesting by "pulling the roots by the tops" difficult, for the petioles tended to break from the root. Thus, additional side-dressed N was needed to maintain healthy petioles and leaf blades for efficient mechani- cal harvesting. 2. Timing: Providing N at the time needed by the plants for optimum response. Uptake of N preceded gain in dry weight by the table beet plants (Figure 1). Since the concentration of total N was high in the seedlings and the con- centration decreased throughout the growing se
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