Evaluation of Punjab American cotton (G. hirsutum L.) genotypes for tolerance to high temperature and their performance during spring summer season.

摘要

Pooled analysis of data showed significant genotypic differences for seed cotton (Gossypium hirsutum) yield and yield components such as number of bolls per plant opened till June 30, boll weight, seed index, ginning out turn and lint index in 7 genotypes (PIL 8, LH 1948, LH 1960, LH 1972, LH 1995, F 1906, and P-17-52-10). The data on mean performance over the two-years clearly showed superior performance of P-17-52-10 compared to the control RS 875 and other genotypes studied. P-17-52-10 showed the highest seed cotton yield (662.3 kg/ha), number of total bolls per plant (14.2), number of bolls per plant opened up to June 30 (10.9), boll weight (2.8 g), seed index (8.1 g) and lint index (4.1 g). Seeds of summer-picked crop of P-17-52-10 also showed 70% germination against 68% of RS 875 and thus met the minimum 65% germination requirement set by seed certification agencies. P-17-52-10 also showed good fibre quality parameters such as fibre length (25.5 mm), uniformity ratio (50.6), micronaire (4.0), fibre strength (1.8.8 g/tex) and fibre elongation (5.7%).