| A field experiment was carried out at the Agricultural Research Station of the College of Agriculture, University of Anbar for the season 2021- 2022, in order to study the effect of different levels of potassium fertilization and planting dates on the growth and yield of local garlic. Four levels of potassium fertilization were used 0, 150, 200, 250 kg ha-1, they were added at three dates 15/9, 1/10, 15/10. The study was carried out as a factorial experiment in a randomized complete block design (R.C.B.D.) with three replications. Plants fertilized at the level (250 kg ha-1) were significantly outperformed in vegetative growth, yield and quality (leaf area, total yield and oil percentage) and reached (7.33 dm2 and 14.48 ton ha-1 and 14.18%) respectively compared to the unfertilized plants that gave the lowest value was (3.73 dm2 and 10.33 tons ha-1 and 12.39%) respectively. The results also showed that the first (early) date was significantly superior in the characteristics of vegetative growth, yield and quality (leaf area, total yield and oil percentage) with 7.08 dm2, 17.23 tons ha-1, and 13.84% respectively, compared to the third planting date with the lowest leaf area, yield, and oil percentage (6.34 dm2 plant, 2.86 tons ha-1, and 12.67%) respectively. The interaction between the factors was significant difference, as the early date and fertilization level of 250 kg ha-1 were superior in the vegetative growth, yield and quality characteristics amounted to (7.64 dm2, 19.70 tons ha-1, and 14.80%) compared to the lowest amount achieved by the late date and non-fertilized plants for the same traits, which amounted to 5.31 dm2, 2, 7.35 tones ha-1 and 12.39% respectively. |
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