An experiment was conducted to standardize green and chemical nanoparticle concentrations and their effect on seed quality in pigeonpea. Among the green nanoparticles, green zinc oxide @ 1250 ppm recorded maximum seed germination (96.25), speed of germination (28.64), mean shoot length (29.23 cm), mean root length (24.32 cm), mean seedling length (53.55 cm), seedling dry weight (60.5 mg), seedling vigour index-I (5153), seedling vigour index-II (5823), field emergence (94.50), total dehydrogenase activity (2.353 A_(480nm) and lowest electrical conductivity (26.49 (rS/cm/g). Among chemical nanoparticles, zinc oxide @ 500 ppm recorded maxjmum seed germination (95.50) speed of germination (24.28), mean shoot length (23.48 cm), mean root length (20.24 cm), mean seedling length (43.71 cm), seedling dry weight (56.3 mg/seedling), seedling vigour index-I (4174), seedling vigour index-II (5371), field emergence (92.5), total dehydrogenase activity (2.021 A_(480)nm) and lowest electrical conductivity (31.88 jiS/cm/g), whereas in control lowest seed germination (92.75), speed of germination (21.63), mean shoot length (19.72 cm), mean root length (19.14 cm), mean seedling length (38.86 cm), seedling dry weight (47.0 mg/seedling), seedling vigour index-I(3575), seedling vigour index-II (4324), field emergence (90), total dehydrogenase activity (1.773 A_(480nm) and highest electrical conductivity (35.87 (iS/cm/g) was observed. These findings suggest that, seed treatment with green zinc oxide @ 1250 ppmand chemical zinc oxide @500 ppm nanoparticles will be helpful to maintain seed quality in pigeonpea.
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