تأثير الرش بالمغذي (20:20:20) والحامض الدوبالي هيومك في نمو وحاصل زهرة الشمس. Heliamthus annuus L

Effect of spraying with nutrients (20:20:20) and Humic acid on Growth and yield of Helianthus annuus L.

ABSTRACT
A field experiment was conducted in the fields of Bin Al-Bitar Preparatory Vocational School in Al-Hussainiya district, affiliated to the Holy Karbala Governorate, during the spring season 2020 with the aim of knowing the effect of spraying with the balanced NPK nutrient (20:20:20) and humic acid on the growth and yield of sunflower cultivar Akmar.
A randomized complete block design (R.C.B.D) was used in split-plot arrangement and with three replications. The experiment included 24 experimental units, which resulted from two factors: the first factor is NPK and it had eight levels T0 = no addition and, T1 = recommendation, T2=1/2 recommendation + 2 g L -1 (nutritious spray), T3 = 1/2 recommendation + 4g L-1 (Nourishing Spray), T4 = 1/4 Recommendation +2g L-1 (Nourishing Spray), T5 = 1/4 Recommendation + 4g L-1 (Nourishing Spray), T6 = 2g L-1 (Nourishing Spray) ), = T7 4 g L -1 (nutritious spray), the second factor is humic at three levels: 0, 2 and 4 g L -1. At maturity, the plants were harvested, growth and yield characteristics were studied, and some qualitative characteristics. The results were analyzed according to the statistical analysis of the data. The results of the study showed the following:
1. Treatment T3 gave significant superiority for some traits, including plant height, number of leaves, leaf area, leaf area index, disc diameter, and biological yield compared to the no addition treatment.
2. Treatment T2 was superior in giving the highest mean of disc diameter, number of filled seeds, number of seeds per disc, weight of 1000 seeds, total seed yield, yield of one plant and oil percentage (with treatment T4 for this trait) compared to the no addition treatment.
3. The foliar spray treatment with humic acid at a concentration of 2gm L-1gave the highest average in growth characteristics and yield for plant height, number of leaves, leaf area, leaf area index, disc diameter, biological yield, number of disc seeds, weight of 1000 seeds number of seeds Full, protein percentage, fertilization percentage, total seed yield, seed yield per plant, oil percentage (with T4 treatment ).
4. The interaction between humic acid and NPK for the treatment of 2 gm L-1humic + T3 gave the highest average for most growth characteristics, yield and qualitative characteristics (plant height, number of leaves, leaf area, leaf area index (with T1 treatment), disc diameter.
5. The results showed the superiority of the interaction at T2 with 2 g L- 1of humic acid in most of the traits, including the number of filled seeds, the number of seeds per disc, the weight of 1000 seeds, the total seed yield, the yield of one plant, the biological yield, the percentage of protein, and the oil yield.
6. The interaction at T2 with 4gm L-1 of humic acid was superior to the percentage of oil.
7. Fertilization treatments with NPK and Humic, as well as, the interaction between them, showed significant differences in most percentages of the concentration of nutrients nitrogen, phosphorous, potassium compared to the treatments of no