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On iimest98e soil� blue grass is very apt to crowd out the ' alfalfa plants. On other soils crab grass seems to take front rank among the alfalfa enemies. Plant dis eases are always preying on alfalfa. These are espe cially troublesome when the vigor of the alfalfa is re duced by growing in soil not perfectly adapted to it. Spring Seeding Versus Late Summer Seeding. Much money and effort has been and is still being wasted by seeding alfalfa at the wrong season of the year. Many experiments havedoi:10.1038/scientificamerican07131912-30 fatcat:hpb6ebk3xbcklgimunccjlv3vu