Effect of bio-fertilizers with levels of NPK on bulb size and other characters of onion (cv Bellary Red) bulbs in kharif season under irrigated condition.

摘要

Field experiments on the effects of bio-fertilizers with levels of NPK on bulb size and other characters of onion (cv Bellary Red) were conducted during kharif of 1999-2000 and 2000-2001 under irrigated conditions under central dry zone of Karnataka. Effects of 12 treatments viz. Control (T1), Azotobacter (T2), Azotobacter+75% N+PK (T3), Azotobacter+100% N+PK (T4), Azospirillum (T5), Azospirillum+75% N+PK (T6), Azospirillum+100% N+PK (T7), VAM (T8), VAM+75% P+NK (T9), VAM+100% P+NK (T10), Recommended NPK (125:50:125 kg/ha) (T11) and 75% recommended NPK (T12) were tested on onion crop cv Bellary Red in medium black soil under field condition. The recommended dose of FYM at 25 t/ha was applied to all the treatments as basal dose. The results revealed that the application of Azospirillum+100% N+PK (Azospirillum+125:50:125 NPK kg/ha) was found to be the best in improving the bulb weight, bulb volume, neck diameter, bulb diameter, number of centers and rings per bulb and also ring thickness under irrigated condition during kharif season. This level could be recommended for Bellary Red onion during kharif season under irrigated conditions, particularly in central dry zone of Karnataka for production of bigger sized onion bulbs.