STUDY ON THE RESPONSE OF THE SAFARI POTATO VARIETY TO SPRAYING WITH THE NUTRIENT SOLUTION HORTIPHYTE AND THE SEAWEED EXTRACT STYMULANT FORTE

An experiment was carried out in vegetable fields, Department of Horticulture and Gardening,College of Agriculture and Forestry, Mosul University for the spring season 2018. To find out the effect offoliar feeding of a seaweed extract (Stymulant forte) in concentrations of (0, 3 and 6) g. L-1and Hortiphytenutrient solution in concentrations (0, 2 and 4) ml. L-1 on the potato crop class A (Safari). The experiment wascarried out with 9 factor treatments according to the Randomized complete block design (RCBD), with threereplications. The results of the studied treatments were tested according to the polynomial Duncan test at aprobability level of 0.05. The results showed the superiority of the treatment of spraying seaweed extract atconcentration 6 g. L-1 was significant, given the highest significant values for average stem length and numberof aerial stem. plant-1, and the percentage of dry matter for the plant%, while spray treatment was superior to 3g. L-1 was significant in the leaf area index, treatment of spraying feeding solution in two or four mlconcentrations. L-1 was significant at average stem length (cm) and number of aerial stem. plant-1, with anincrease of (5.10 and 15.35%), respectively; compared to the comparison treatment. The two characteristics ofchlorophyll and the percentage of dry matter per plant were not different from the comparison treatment. As forthe results of the total yield, it was given the treatment of spraying the seaweed extract at a concentration of 6 g.L-1is the most significant value for the number of tubers. Plant-1, average weight of tuber (kg), yield of one plant(kg), percentage of dry matter for tubers%, and production rate per area (tons. ha-1) compared to the rest of thetreatments, and reached (13.111 tuber. Plant-1, 0.126 kg, 1.63 kg, 16.127%, 87.390 ton. ha-1), respectively. Thetreatment of spraying the nutrient solution affected the 2 or 4 mL concentrations. 1 liter-1 morally by giving thehighest significant values for the average weight of the tuber, the yield of one plant and the percentage of drymatter for tubers and total production per area compared to the no-spray treatment, and with an increase of11.11 kg, 11.68 kg, 7.43%, 11.54 tons. ha-1), respectively. It did not differ from the comparison treatment interms of the number of tubers. plant