Different age of chicken manure may create a different effect on growth and production of plants. The reason for conducting the study was to determine the response of lettuce (Lactuca sativa L.) for mature chicken manure (old); its age was 6 months, and immature chicken manure; its age was less than 10 days. The research consisted of eleven treatments. Five deferent levels included 50, 75, 100, 125 and 150 grams per plant (g plant-1) were used for each type of chicken manure (mature and immature) plus control treatment, and three replications were conducted for each treatment. The parameters of fresh weight (edible part only), leaves number, head diameter and plant length were recorded, at harvesting period. Also, the fresh weight has been converted to lettuce's yield ton hectare-1 (ton h-1). The result indicated that applying the old chicken manure (except 50 g plant-1) caused a significant decrease (P< 0.05) in fresh weight, leave number, head diameter and the yield of lettuce. However, lettuce supplied with high levels of immature chicken manure exhibited significant increase (P< 0.05) in fresh weight, plant length and the yield. Lettuce fertilized with 150 g plant-1 of immature chicken manure produced 68.48 ton h-1 which was 18 tons higher compared to only 50.20 ton h-1 in control’s plot. Based on the obtained result, avoiding application old chicken manure and utilization fresh manure in order to stimulate vegetative growth and lettuce yield are recommended.
The present study was conducted to evaluate the effect of different growing mediums {sand, peat moss, and mix (sand + peat moss 1:1 v/v)} and spraying with 0,100 and 150 mg L-1 of humic acid on vegetative and root parameters of “Wonderful” pomegranate hardwood cuttings at Bakrejo nursery station, Sulaimania city, Iraq in 2021. They were planted in polyethylene black bags on 15-3-2021. Using randomized complete block design within the factorial experiments with three blocks. The results indicated that leaves, roots and shoots number, root wet weight, and root length were increased significantly in peat moss medium. Cuttings grown in a mixed medium showed a significant increase of leaf growth including leaf area, leaf dry weight, and chlorophyll content. In addition, spraying with 100 mgL-1 of humic acid caused a significant increase in the root characteristics, and shoot number compared to the control. Furthermore, the maximum root growth was recorded in the interaction between peat moss medium and applying 100 mgL-1 of humic acid compared to other treatments
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