. Efficient use of nitrogen on crop land in the Northeast. Plants; Soils. Efficient Use of Nitrogen About two-thirds of the fertiHzer N applied broad- cast-preplant and worked into the soil is available to the plants during the growing season. Thus, 150 kg fertilizer N/ha are needed preplant to supply 100 kg available N/ha to the plants during the growing season. Most efficient plant use of N fertilizer occurs when the N fertilizer is applied as side-dressed applications during the growing season just prior to the plant de- mand for rapid uptake and response. Early applica- tions of side-dress
. Efficient use of nitrogen on crop land in the Northeast. Plants; Soils. Efficient Use of Nitrogen About two-thirds of the fertiHzer N applied broad- cast-preplant and worked into the soil is available to the plants during the growing season. Thus, 150 kg fertilizer N/ha are needed preplant to supply 100 kg available N/ha to the plants during the growing season. Most efficient plant use of N fertilizer occurs when the N fertilizer is applied as side-dressed applications during the growing season just prior to the plant de- mand for rapid uptake and response. Early applica- tions of side-dressed N are necessary within the limit- ed rooting zone of seedlings to develop large plants and rooting systems which extend through the sur- face soil. Plants need a large, efficient root system to remove soil N during the growing season. As har- vest approaches, the soil may be nearly depleted of available N. But side-dressed N applied below the surface and within the root zone is nearly all avail- able to the plants. Sources of N fertilizer for side- dressing include solutions, urea and ammonium ni- trate. Additional side-dressed N may be needed later in the growing season to maintain top growth for easy mechanical harvesting, if the beets are held for late harvest. Overall fertilization system Fertilizer N may be added to supplement soil N when the crop response is likely to be most intense. Seedlings fertilized with N at or near planting time had a high concentration of nitrate and developed large plants which used both the fertilizer and soil N during the growing season. As harvest approached, nitrate concentration in the roots declined to a low level. Further, the roots had a low glutamine con- centration, and a high sugar concentration, and yields were abundant. Since excess nitrate and nitrite in food are potential health hazards and since excess glutamine may cause bitter flavor in canned beets, their levels should be low at harvest time. In this experiment, proper N ma
Size: 1571px × 1590px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublishernewhavenconnect, booksubjectplants
