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Muhammad Ayyaz Khan, Khalil Ahmad and Jamil Ahmad, 1999. Effect of Potassium Levels on the Yield of Sunflower (Helianthus annuus L.). Pakistan Journal of Biological Sciences, 2: 402-403.
DOI: 10.3923/pjbs.1999.402.403
URL: https://scialert.net/abstract/?doi=pjbs.1999.402.403
DOI: 10.3923/pjbs.1999.402.403
URL: https://scialert.net/abstract/?doi=pjbs.1999.402.403