Genetic variability for nitrogen uptake in wheat

Twenty one genotypes and 21 hybrids of wheat were used to define the extent of variability in nitrogen uptake at 45 days and 90 days of plant growth and at harvest (both in grains and straw). Appreciable variability was recorded for nitrogen percentage and total plant nitrogen (PN) at all the stages. The percentage of nitrogen decreased with maturity. The varieties WH 157, UP 368, UP 270, Bulk 1858, CPAN 1281 and K 227 translocated more nitrogen to the grains. Nitrogen harvest index showed positive correlation with grain harvest index. The positive correlation of PN with grain yield and biological yield appeared to be stronger with advancement of growth. Using PN as a parameter, WH 157, WH 147, UP 270, 5 311 and hybrids HD 2122 X WH 147, WH 147 X WH 157 and HS 1138-6-4 X K 227 were the promising genotypes.