Abstract
The study was conducted during the spring season (2022) to determine the effect of early planting for four planting dates (18/1, 2/2, 17/2 and 4/3) and four levels of potassium fertilizer (30, 60, 90 and 120) kg ha-1 , on the yield and fullness of sunflower grains, cultivar Shamoos, was carried out by arranging the split panels according to a Randomized Complete Block Design with three replicates. The results of the experiment showed significant effects of planting dates on yield and its components, as the planting date exceeds D1 on the grain filling period, the number of grains filled, the weight of 1000 grains, the yield of the individual plant, the biological yield and the percentage of fertilization, the results of the experiment also showed a significant effect of potassium levels on yield traits, the K4 fertilization treatment gave the highest average of the duration of grain filling and the number of filled grains, whereas, the K2 fertilization treatment gave the highest mean for the 1000 grain weight, regarding the interaction between the two factors of the study, the results showed significant differences between the experimental treatments on the yield, the D1K4 interference treatment gave the highest mean of the grain filling time. Keywords: planting dates, potassium levels, sunflower grains (Helianthus annuus L.), Shamoos cultivar.
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