Abstract
A field study was carried out in unheated plastic house A field study was carried out in the unheated greenhouses of the Department of Horticulture and Landscaping at the College of Agriculture, University of Anbar, at longitude 43.31 and latitude 33.42, to evaluate the effect of adding levels of organic manure (poultry manure) to the soil (weight to weight) and foliar application by spraying liquorice and bread yeast extract on cucumber growth and yield. The study included adding poultry manure to the soil at three levels, 2, 3 and 5%, with spraying two concentrations of liquorice, 2.5 and 5 g liter-1, with or without bread yeast extract 1:10, in addition to control treatment (without addition), and the mineral fertilization treatment according to the fertilizer recommendation. The experiment was carried out according to a Randomized Complete Block Design (R.C.B.D) with three replications, and the treatments means were compared using Least Significant Difference Test (L.S.D) at the probability level of 0.05. The results showed that: organic fertilization of poultry manure 2% + liquorice extract 5 g. L-1 recorded a highest leaf area 1435.9 dcm2, and highest plant height (190.0 cm). While the use of poultry manure 3% + liquorice extract 5 g. Liter -1 gave the highest relative content of chlorophyll in leaves (84.47 Spad), whereas the control treatment gave the highest percentage of dry matter in the plant (12.54%). The treatment of poultry manure 2% + liquorice extract 2.5 g. Liter -1 gave the largest number of fruits (14.5 fruits plant-1), the highest yield per plant (1.228 kg. plant-1, the highest total yield of 1.228 tons Plastic house-1, and the lowest nitrates concentration in fruits (9.541 mg kg-1). whereas the treatment of poultry manure 2% + liquorice extract 2.5 g. 1 liter-+ bread yeast extract 10:1. gave the highest fruit weight of 88.76 g. The treatment of poultry manure 5% + liquorice extract 2.5 g. Liter -1 achieved the highest nitrogen concentration of 1.758%, and the highest potassium concentration of 6.200% in the fruits. While the treatment of poultry manure 5% + liquorice extract 2.5 g. Liter -1 + bread yeast extract 10:1 gave the highest phosphorous percentage of 0.850% in fruits.
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