Breeding strategy for wheat improvement based on exploitation of varietal responsiveness towards phosphorus levels: a proposed method.

摘要

A study was conducted (1987-89) to evaluate 15 newly released wheat genotypes for commercial cultivation for their response towards different levels of phosphate fertilizers (0, 20, 40, 60, 80 and 100 kg/ha), particularly in view of phosphorus-deficient soil of Uttar Pradesh, India. The 15 cultivars were evaluated at 6 levels of P with and without application of recommended rates of N and K under irrigated (N, K, 120, 40 kg/ha) and rainfed (N, K: 100, 40 kg/ha) conditions, resulting in a total of 48 artifically created environments. The correlation coefficients for all pairs of 15 genotypes and the average grain yield of each genotype are tabulated. Four pairs had significant positive correlations reflecting almost similar responses of the genotypes of the pair over environments used. Genotypes CPAN 1676 and HD 2285 had almost similar response patterns and therefore, one genotype of such a pair can be recommended for cultivation in agricultural conditions where another is well suited. Likewise, UP 2113 and HD 2329 exhibited a similar response pattern. Both pairs PBW 34 and C-306 and PBW 34 and HD 2204 were also isoresponsive for the phosphatic levels used presently. Therefore, both C-306 and HD 2204 wheat cultivars could be recommended where PBW34 cultivar is well suited for cultivation.