Abstract
Grid selection was investigated as a means of reducing environmental variation prior to selection for low neutral detergent fiber (NDF) concentration in smooth bromegrass (Bromus inermis Leyss.). Eleven populations of 350 plants each were arranged into 10 grids of 35 plants each. Adjustment of NDF concentration by block means and standard deviations reduced the phenotypic variation to 50 to 94% of the original variance. Adjustment also reduced or eliminated spatial patterns of phenotypic variation in five of eight populations with significant patterns to original NDF values. Selection for low NDF tended to identify plants from blocks with a low mean NDF in some populations. When selection was based on t-scores, the number of plants representing each block was a random variable in each population. Use of grid selection with a t-score adjustment should increase the efficiency of phenotypic recurrent selection for low NDF concentration.
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