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 of
foliar feeding of a seaweed extract (Stymulant forte) in concentrations of (0, 3 and 6) g. L-1
and Hortiphyte
nutrient solution in concentrations (0, 2 and 4) ml. L-1 on the potato crop class A (Safari). The experiment was
carried out with 9 factor treatments according to the Randomized complete block design (RCBD), with three
replications. The results of the studied treatments were tested according to the polynomial Duncan test at a
probability level of 0.05. The results showed the superiority of the treatment of spraying seaweed extract at
concentration 6 g. L-1 was significant, given the highest significant values for average stem length and number
of aerial stem. plant-1
, and the percentage of dry matter for the plant%, while spray treatment was superior to 3
g. L-1 was significant in the leaf area index, treatment of spraying feeding solution in two or four ml
concentrations. L-1 was significant at average stem length (cm) and number of aerial stem. plant-1
, with an
increase of (5.10 and 15.35%), respectively; compared to the comparison treatment. The two characteristics of
chlorophyll and the percentage of dry matter per plant were not different from the comparison treatment. As for
the results of the total yield, it was given the treatment of spraying the seaweed extract at a concentration of 6 g.
L
-1
is 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 the
treatments, and reached (13.111 tuber. Plant-1
, 0.126 kg, 1.63 kg, 16.127%, 87.390 ton. ha-1
), respectively. The
treatment of spraying the nutrient solution affected the 2 or 4 mL concentrations. 1 liter-1 morally by giving the
highest significant values for the average weight of the tuber, the yield of one plant and the percentage of dry
matter for tubers and total production per area compared to the no-spray treatment, and with an increase of
11.11 kg, 11.68 kg, 7.43%, 11.54 tons. ha-1
), respectively. It did not differ from the comparison treatment in
terms of the number of tubers. plant-1
.