|Hokanson, Stan - UNIV OF MINNESOTA|
Submitted to: HortScience
Publication Type: Abstract Only
Publication Acceptance Date: August 1, 2003
Publication Date: August 1, 2003
Citation: Black, B.L., Hokanson, S., Lewers, K.S. 2003. Fruit nitrogen content of eleven strawberry genotypes grown in advanced matted row culture. Hortscience. 38(5):687. Technical Abstract: Information on nitrogen (N) removal during harvest is necessary for developing fertility programs and for nutrient management planning. Five strawberry cultivars and six numbered selections were grown in advanced matted row culture (AMR) and compared for harvest removal of N over two seasons. The cultivars Allstar, Earliglow, Northeaster, Ovation, and Latestar, and the numbered selections B51, B683, B781, B793, and B817 were established in replicated AMR plots in both 1999 and 2000. During establishment, plots were fertilized with 130 kg N per hectare. During the first fruiting season, ripe fruit was harvested twice weekly to determine total yield. Sub-samples were collected weekly and stored for subsequent N analysis. The fruit sample corresponding to peak harvest date was dried and total N determined by Dumas combustion. There were significant differences in harvest removal of N among genotypes. N removal values for numbered selections ranged from 14.4 to 20.1 kg N per hectare for B51 and B793, respectively. For cultivars, N removal ranged from 15.2 to 21.6 kg N per hectare for Ovation and Earliglow, respectively. The amount of N removed at harvest was largely determined by yield, however there were also significant genotype differences in fruit N content, ranging from 0.67 to 1.00 mg N per gram fresh weight for B817 and Earliglow, respectively. The harvest N removal rates presented here represent 11.1 to 16.6% of fertilizer N applied in the establishment year.