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EFFECT OF SEEDLING DISK HEIGHT AND SEEDLING DENSITY ON TOBACCO SEEDLINGS GROWTH Effect of Root-Zone Volume Restriction on the Growth and Gas Exchange Parameters and Chlorophyll Fluorescence Parameters of Apillm graveolens L.Seedling Effects of different nitrogen application amounts and seedling densities on nitrogen accumulation and transport in winter wheat at anthesis stage Seedling banks and their relationship with the standing vegetation under different erosion environments in the hill-gully Loess Plateau region SEEDLING DYNAMICS IN RESPONSE TO MOWING AND GRAZING IN A TYPICAL STEPPE COMMUNITY IN INNER MONGOLIA, CHINA Relationship between Teak Seedling Density and Seedling Yield and Quality