Cabbage Plant Responses to Nitrogen Fertilization1
- N. H. Peck2
Nitrogen fertilization may affect the yield components and quality attributes of vegetables grown for processing. The objective of this study was to determine the effects of N fertilization systems on cabbage (Brassica oleracea L. Capitata group) grown for kraut. The concentrations and contents of nitrate-N and total N in the plants were used to determine the availability of N and uptake of N from the soil and/or fertilizer N during the growing season.
Urea broadcast at 15 g N/m2 and worked into the soil preplant was compared to ammonium nitrate applied at a rate of 15 g N/m2 split into three 5 g N/m2 applications (banded at planting time plus sidedressed early plus sidedressed midseason) as fertilization systems for cabbage grown under field conditions in 1978 and 1979. The soil was a Lima silt loam (Glossoboric Hapludalf, fine loamy, mixed mesic), a productive soil derived from calcareous glacial till. Plants were spaced 4/m2.
Tops of four plants grown without fertilizer N contained 12 g N/m2 at harvest. Fertilizer N applied at 15 g N/m2 increased the total N in the plant tops to 22 g N/m2. This was an increase in plant N equivalent to two-thirds of the rate of fertilizer N applied.
Cabbage plants grown without fertilizer N yielded 4 kg fresh weight/m2. Fertilizer N at 15 g N/m2, either as urea or ammonium nitrate, yielded 8 kg of heads/m2. Fertilizer N at 30 g/m2 from urea plus ammonium nitrate yielded 10 kg heads/m2. Plants grown with fertilizer N had a lower percentage of dry weight in the heads, and had higher percentages of burst heads and heads with tipburn than heads of plants grown without fertilizer N. Thus, fertilizer N increased the yield but decreased the quality of cabbage heads grown for kraut.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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