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In the perennial strawberry production system, removal of the harvested crop represents a loss of nitrogen (N) that may be infl uenced by cultivar. Eight strawberry (Fragaria ×ananassa Duch.) cultivars and eight numbered selections grown in advanced matted row culture were compared over three seasons for removal of N in the harvested crop. Replicated plots were established in 1999, 2000, and 2001 and fruited the following year. 'Allstar', 'Cavendish', 'Earliglow', 'Honeoye', 'Jewel', 'Northeaster', 'Ovation', and 'Latestar' and selections B37, B51, B244-89, B683, B753, B781, B793, and B817 were compared for yield and fruit N concentration. Harvest removal of N (HRN) was calculated from total season yield and fruit N concentration at peak harvest. There were signifi cant differences in HRN among genotypes, ranging from 1.80 to 2.96 g N per meter of row for numbered selections B781 and B37, respectively. Among cultivars, HRN ranged from 2.01 to 3.56 g·m -1 for 'Ovation' and 'Jewel', respectively. The amount of HRN was largely determined by yield, however, there were also signifi cant genotype differences in fruit N concentration, ranging from 0.608 to 0.938 mg N per gram fresh weight for B244-89 and 'Jewel', respectively. These differences indicate that N losses in the harvested crop are genotype dependent. Efforts to improve the sustainability of food production practices have resulted in increased interest in the conservation of soil and water resources, including the reduction of soil and nutrient losses. Many states in the northeastern U.S. have enacted nutrient management legislation to encourage reduced nutrient run-off and leaching from agricultural lands (Lea-Cox and Ross, 2001). These plans focus on nitrogen and phosphorus. Central to improving nutrient management practices is the quantifi cation of the nutrients added to, and lost from an agricultural system. In the case of nitrogen, losses from the agroecosystem can occur through several pathways, includ- ing volatilization of reduced N, microbial denitrifi cation, removal in the harvested crop, surface run-off and leaching. The latter two are primary concerns in determining nonpoint source nutrient pollution. Commercial practices for N fertilization of strawberry differ depending on soil type, cultivar, and cropping system. In an annual hill system using fertigation, annual rates can range from 85 to 450 kg·ha

Fruit Nitrogen Content of Sixteen Strawberry Genotypes Grown in an Advanced Matted Row Production System