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Asian Journal of Plant Sciences

Year: 2002  |  Volume: 1  |  Issue: 4  |  Page No.: 324 - 325

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

M. Ehsan Akhtar, Khurram Bashir, M. Zamir Khan and Khalid Mahmud Khokhar


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.

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