Effect of Potash Application on Yield of Different Varieties of Onion ( Allium cepa L.)

摘要

An experiment was conducted to study the effect of applied potassium fertilizer on three bulb sizes (10-15, 15-20 and 20-25 mm) of five varieties of onion at the National Agricultural Research Centre (NARC), Islamabad during 1999. Nitrogen and phosphorus were applied @ 150 N and 100 P₂O₅ kg ha ^-1 as basal fertilizers. Potash was applied @ 200 kg K₂O ha ^-1. The positive effect of applied K was noted on all the varieties of onion. Maximum yield of 61.11 t ha ^-1 was obtained when K was applied along with N and P to Phulkara variety of bulb size 15-20 mm. The lowest yield of 12.03 t ha ^-1 was observed in no- K fertilizer treatment in Swat No. 1 of bulb size 20-25 mm. It was observed that the application of K @ 200 kg ha ^-1 along with N and P fertilizers significantly increased the yield of all varieties of onion irrespective of seedling bulb sizes.