436 PB 209 VARIATION IN N2 FIXATION AND GROWTH AMONG HALF-SIB FAMILIES OF MAACKIA AMURENSIS

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  • 1 Department of Horticulture, Iowa State University, Ames, IA 50011-1100

Maackia amurensis Rupr. & Maxim. associates with N2-fixing rhizobia, but variation in N2 fixation among genotypes of this species is not known. We determined the effect of N2 fixation on growth of plants from seven half-sib families known to differ in seed mass and seedling growth when provided N. Seedlings were grown in Leonard jars for 12 weeks in a greenhouse. Mass of control plants provided N and nodule mass on plants inoculated with rhizobia (USDA 4349) and not provided N differed among families. Among plants not provided N, inoculation did not increase dry matter but did reduce chlorosis. Therefore, plant N content also will be discussed as an indicator of efficiency of N2 fixation. Results indicate N2 fixation improves plant quality in low-N soils but will not eliminate the need for N applications during seedling production.

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