The average estimated cash rent was $202 per acre on top quality land, $161 per acre on average quality land, and $124 per acre on poor quality land. This was an increase in rental rates of 2.0% for top quality land, 1.9% for average quality land, and 2.5% for poor quality land.
R-Group. In solution it is the nature of the amino acid R-groups that dictate structure-function relationships of peptides and proteins.
R-group is the most important group in amino acids. Since amino acids in proteins are linked by peptide bonds, only the R-group is free. It is this group which defines the chemistry of proteins. Classification of amino acids is also based on R-groups.