The effect of different periods of irrigation on the protein and its components of strong gluten wheat variety Zhengmai 9023 was studied in field.The results were as follows.With the increase of irrigation times,the protein content of wheat decreased,i.e.W1> W2>W3,which showed that increasing water had dilution effect on protein content;the free amino acid content of wheat grain improved and the transportation of free amino acids to protein reduced;the contents of glutelin and globulin decreased generally,t...