TY  - CPA
AU  - Tripathi,S.C.
AU  - Sayre,K.D.
AU  - Kaul,J.
ED  - Australian Agronomy Conference
ED  - International Crop Science Congress
TI  - Genotypic effects on yield, N uptake, NUTE and NHI of spring wheat
PY  - 2004///
CY  - Brisbane (Australia)
PB  - Australian Society of Agronomy
KW  - Grain
KW  - AGROVOC
KW  - Yields
KW  - Harvest index
KW  - Nitrogen
KW  - Spring wheat
KW  - Genotypes
N1  - Draft
N2  - Ten spring wheat (Triticum aestivum L.) genotypes (4 Indian and 6 Mexican) were evaluated at 180 and 300 k g N/ha application at CIMMYT (Centro Internacional de Mejoramiento de Maiz y Trigo), near Ciudad Obregon, Sonora, Mexico during 1997-1998 and 1998-1999 for their yield potential, N concentration in grain and straw and their relationships. From pooled analysis, effect of N rates on biomass, yield and yield attributing characters was non-significant whereas genotypic effects on the above mentioned characters as well as on grain N concentration, uptake, nitrogen harvest index and utilization efficiency were significant. From combined analysis across years, grain yield and harvest index (HI) ranged from 7.81 t/ha (Pavon 76) to 9.13 t/ha (Baviacora 92) and from 39.5 % (Pastor) to 45.1 % (Baviacora 92), respectively. The range of grain N concentration, uptake and nitrogen utilization efficiency ( NUE) was from 1.99 % (Baviacora 92) to 2.23 % (Rayon 89), from 147.6 kg/ha (Pastor) to 169.5 kg/ha (UP 2338), and from 29.8 kg grain/kg N uptake (Pavon 76) to 35.6 kg grain/kg N uptake (Baviacora 92), respectively. The grain yield correlated positively with HI (r = 0.66), NHI (r = 0.62), grain N uptake (r = 0.77) and negatively with N concentration in grain (r = -0.68) and straw (r = -0.64). The correlation between HI and NHI was highly positive (r = 0.89), which suggested that enhancing these two indices could lead to higher grain yield and protein content. Therefore, these two indices should be given more emphasis for enhancing yield potential of spring wheat genotypes
ER  -