Effect of Licorice Root Extract And Humic Acid on Yield Characters of Summer Squash (cucurbita Pepol.)

Abstract

Field experimentwas indicated at the experimental vegetable farms, college of agriculture, Duhok University,Kurdistan region-Iraq during the spring growing season of 2018, to evaluate the impact of licorice root extract (0, 5, 10 g.L-1) and humic acid (0, 2, 4 g.L-1) as foliar exerciseon yield traits of summer squash (Cucurbita pepo L.) (cv.Naji F1).These experiments were laid out in a factorial arrangement in randomized complete block design(F-RCBD) with three replications.The results of this experiment showed that foliar spray of squash plants with licorice root extract at 10g.L-1 recorded highest value in most of yield traits and in terms the early yield (0.389kg.plant-1) was significantly increased. Moreover, spraying plants with humic acid atlevel 2g.L-1 the yield characters of squash plants was significantly increased in traits of early yield (0.383 kg.plant-1)and marketable yield (34.86 ton.ha-1), while humic acid spray at level 4g.L-1 significant affect on fruit number (13.81), fruit length (14.14 cm), fruit diameter (3.65cm),  average fruit weight (123.41gm), total yield (1.707 kg.plant-1) and total yield (39.61ton.ha-1), except the unmarketable yield (4.656 ton.ha-1) were decreasedwith increasing the level of humic acid.In addition, the combination treatments between licorice root extract at 10g.L-1 and humic acid at 4g.L-1 gave the highest value in the most of yield parameters in studied summer squash plants