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This study was carried out during the Agricultural season 2016 -2017 in the College of Agriculture/ University of Dohuk /Kurdistan region/ Iraq to study the effect of spraying Humic acid at three concentrations i.e. (0, 9 and 18ml.L-1on four cultivars of potato(Solanumtuberosum L.) i.e.(Sifra, Ravila, Silvana and Fabyoula ) that grown under plastic houses conditions.The results indicated that the all cultivars was good in vegetative growth, quality and yield characteristic especially cultivars Rvillo that gave high yield per plant and per square meter significantly, compared with other cultivars. Also spraying plant with a concentration 18ml.L-1 of humic acid with all cultivars gave goodresults especially in Ravillo cultivars compared with unsparing plant that gave the lower yield and less tuber number per plant.

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A field experiment was conducted during growing season (2008 –2009) at Univ. of Tikrit -College of Agriculture. Horticulture and LandscapeExperimental Station. to study the response of Allium sativum L. for humic acidtreatments and spraying by nutrient solution Prosol at four concentration (0 ,0.5, 1 , 2 ) g/L . The experiment was in split plot design in RCBD with threereplications , The humic treatment considered as the main plot. The resultsshowed that humic treatment gave significant increases in most characteristicsstudied, and gave production of 3.38 ton / donum . Spray treatment with 2 gm/L concentration gave production of 3.34 ton/ donum . Treatment interactionbetween humic treatment and spraying with Prosol 2 g/L concentration gave thehighest content from Fatty acid ( 20.75 , 78.63 , 322.61 , 662.70 , 23.63 ,677.59) microgram/ gm for (Myristic acid , Stearic acid , Palmatic acid ,Linolenic acid , Oleic acid and Linoleic acid) respectively .

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This experiment is conducted in the Research Station, Abu-Ghraib , directorate of Agricultural Research , Ministry of Agriculture during the Autumn season of 2013, to investigate the effect of P fertilizer , bio fertilizer, humic acid and their interaction on the availability of, P and Fe, in the soil, their uptake, on yield and some yield components of corn(Zea mays L).The RCBD has been adapted and each treatment has been replicated three times. The experiment treatments are two levels of P fertilizer, P0 (without adding P fertilizer), P1 (adding 30 kg P. ha-1), three levels of humic acid, H0 (withoutadding humic acid), H1 (adding 20 kg H.A ha-1), H2 (adding 40 kg H.A. ha-1), and B0 (without inoculation of seed), B1 (inolculating seed with Bacillus), B2 (inoculating seed with Pseudomonas bacteria). P fertilizer and humic acid treatments are added and mixed with soil surface (10-15 cm). All experiment units have received 240 kg N ha-1 and 120 kg K ha -1 in three doses during the plant growth. Inoculated and other corn seed are planted in 10-7-2013 in plots of (3x3) m2 with distance between plants 0.25 and between lines 0.75 forming 4 lines and plant population 48 plant plot-1. The results can be summarized as follows: In the field experiment, the main effects of P fertilizer, biofertilizer and humic acid are significant in increasing the availability of P and Fe in soil and eventually increasing their uptake by corn plant. However, more significant increases are associated with all possible interactions of these factors. The highest availability of P, in soil is obtained at the interaction treatment of P1B1H2, and Fe at the interaction treatment P1B2H2 at both silking and harvesting stages of corn.

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An experiment has been carried out at field in Gardmalla/Qushtapa with reading GPS (longitude 440035E, Latitude 360023N) ,414 meter above sea level, 15.5 Km far Southern of Erbil city during the Winter season of 2017 to test the effect of application humic acid in soil and spraying boron on the growth and productivity of water on cauliflower. Factorial experiment 3 (humic acid) (0, 10 and 20 kg ha-1 using) × 4 (boron foliar) ( 0, 0.5, 1.0, and 2.0 kg B ha-1 ) using solid snow cultivars in RCBD with three replicates.Planting solid snow cultivars was done on 11/7/2017 (seeding date), 10 /8 /2017 (transfer to field) and 22/12/ 2017 picking or harvesting date. Irrigation water was applied at 35% depletion to the depth of total plant root and calculate the depth of water applied up to field capacity. Irrigation system is surface flow irrigation through line pipe provided with meter gages for measuring water applied.The results show that the application of boron and humic acid increase significantly all growth and yield parameters of cauliflower improved the highest values of leaf length (cm), leaf width (cm) and chlorophyll content (mg/cm2), recorded 47.67 cm, 28.45 cm and 40.66 mg/cm2; 75.39 cm, 37.55 cm and 43.11 mg/cm2 and 80.0 cm, 40.29 cm and 47.33 mg/cm2 in treatment 2 kg ha-1 of boron foliar and 0, 10 and 20 kg ha-1 of humic acid addition, respectively. The values of curd weight (kg), curd diameter (cm) and total yield (Mg/ha) values were 0.97 kg, 19.45 cm and 25.38 Mg/ha; 1.33 kg, 22.33 cm and 32.66 Mg/ha and 1.40 kg, 23.78 cm and 36.53 Mg/ha in treatment 2 kg ha-1 of boron foliar and 0, 10 and 20 kg ha-1 of humic acid application, respectively. Values of water productivity (Kg/m3) ranged between 6.25 to 12.18 Kg fresh (green) curd m-3 water applied.

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ABSTRACT The experiment was conducted for the autumn season (2018 - 2017) in one of the greenhouses belonging to the Department of Horticulture, College of Agriculture, Al-Qasim Green University, in the soil with a sandy texture. The randomized complete block design (RCBD) was used, with three replicates. The experiment included 3 replicates and for each replicate is a 9 treatments to became the total number of experimental units are 27 treatment: The drainage wastes which is symbolized by (M), poultry wastes which is symbolized by (D), cow manure which is symbolized by (A), and peat moss which is symbolized by (P) randomly distributed on the experimental units, with a rate of (20, 40 tons.ha-1) for each treatment, with three replicates in addition to the control treatment (without any adding). The results showed that the organic wastes from plant origin (peat moss) were characterized by raising their content of organic matter, organic carbon and humin than the rest of the wastes, where their concentrations amounted to (479.4, 206.54, 312.0 g.kg-1), respectively. while the highest concentration of humic acid amounted to (17.52 g.kg-1) and the lowest C: N ratio amounted to (8.96) in poultry wastes compared to other wastes. The eggplant yield increased with adding organic wastes compared to the control treatment. Poultry wastes gave the highest yield of eggplant amounted to (100.00, 178 ton.ha-1) for 20 and 40 ton.ha-1, respectively.

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A field experiment was conducted during the autumn season of 2018 at agricultural research station in Al- Qurna district (80 km north of Basra center). The aim was to study the effect of spraying different concentrations of humic acid (HA) and silicon on the some growth characteristics of maize (Zea mays L.). The experiment was conducted using Three Concentration of humic acid were used 0, 2 and 4 gm L-1, which took the following symbols H0, H1, and H2 respectively and four concentrations of silicon 0, 1, 2 and 3 mML-1 which took the symbols S0, S1, S2 and S3 respectively. A factorial experiment was used in randomized completely block design with four replicates. Maize seeds cv. Fajir1 were planted at 20/7/2018 in a silty loam soil. The results showed that the concentrations of HA differed significantly in all most of the studied characteristics, plant height, leaf area and ear length with an increase by 11.69, 24.89 and 3.49% respectively as compared to the control treatment (H0). The spraying with silicon showed a significant effect. Moreover, the concentration of S3 gave the highest values for plant height, stem diameter, leaf area and ear length. The interaction between HA and silicon showed a significant effect on some of the studied characteristics, the combination of S3×H2 produced the highest values of plant high (174.42 cm) and leaf area (7390.65 cm2).

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This study was carried out in horticulture and land scape design departments fields- collage of agriculture- university of Kirkuk during 2016/4/1 to 2016/10/1 to study effect of organic fertilizer by Humic acid with three levels (0,50 and 100) mg.L-1 and (NAA) with three levels (0,1000 and 2000)mg.L-1 on some growth characteristics of olive seedlings Bashyki var.The results shows significant increase in all shoot and root characteristics (height and dimeter of main stem, number of branches and leaves, leaf area, shoot dry weight, chlorophyll in leaf, height and dimeter of main root, and root dry weight ) for olive seedlings throw addition of Humic acid with the 100 mg.L-1 and NAA with 1000 mg.L-1 singular or interaction which obtained (38.45 , 0.77, 23.97, 0.91)cm and dry weight of shoots and roots (58.08 , 69.78) g . In other side the treatment with NAA 1000 mg.L-1 for height and dimeter of main stem (33.47 , 0.68 , 22.27 , 0.87)cm and shoot and root dry weight (48.38 , 50.68)g.

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This study was conducted at a private orchard in Awnat village-Tikrit city Salahaddin governorate during 2013 season to explain the effect of foliar nutrition (Humic acid) and spraying with Brassinosteroid on decreasing flower drops and fruit set as well as improving some specific and qualitative properties of orange. The experiment included spraying plants with Brassinosteroid (0.00، 0.010، 0.020 mg.l-1) and then completed with spraying with Humic acid conc. (0،2،4،6) m.l-1 Result show the significant effect to BRs treatment( 0.020) mg.L-1 gave highest fruit set and lowest dropping and The highest proportion of the remaining fruits on trees (25 ، 5.66 ، 53.6) % respectively. Humic acid treatment gave highest leaf area was 29.6 cm2 and relative chlorophyll was 74.1 Spad Unit and highest proportion dried material in the leaves reach 45.19%.. Humic acid treatment gave highest fruits reach 15.89 kg and highest proportion fruits number was 92.4 fruit.tree-1 also gave significant top in fruit volume reach 321.7 cm3.

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A factorial plastic pots experiment was conducted in Fallujah Region / Al-Anbar governorate in the season 2012-2013 To investigate the influence of application methods of the humic acid (control, soil application foliar application , and soil application+ foliar application ) which extracted from wheat straw compost and phosphorus levels ( control ,20,40) mg p. kg-1 soil on some properties of barley plants growth and yield in a silty loam soil, using ( RCBD ) design with three replication and treatment means were compared according to L.S.D. test at 5%. Results showed that all application methods of the humic acid caused in a significant increases in most of parameters used and mix application (land+foliar) have surpass in plant height, straw yield, P uptake grain yield, fertilization efficiency (89.66 cm, 51.11, gm.pot-1, 184.1, mg.pot -1, 17.25 gm.pot -1, 36.8% ) respectively. phosphorus levels caused a significant increases in all above parameters and the level 20 mg p kg-1soil gave the highest results at the plant height, straw yield , (86.20 cm, 49.56, gm.pot -1 ) respectively. While the level 20 mg p kg-1 soil achieved highest increase in P uptake , grain yield, and fertilization efficiency (183.2 mg.pot -1 18.06 gm.pot -1 , 43.1% ) respectively. The interaction between the study factors were significant and the mix application method combined with the 20 mg p. kg-1soil level achieved highest increase in plant height, and P absorption efficiency ( 90.37cm , 44.25%) respectively while the land application method combined with the same phosphate level achieved highest increase in straw yield ) 51.98 gm.pot -1 ) the mix application method combined with the 40 mg p. kg-1soil level achieved highest increase in P uptake, grain yield and fertilization efficiency (201.4 mg.pot-1, 18.68 gm.pot-1 ,48.0%) respectively

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Field experiment was conducted in a farm of Najaf governorate during 2013-2014 season , to study the effect of different concentrations of ascorbic acid and humic acid on the growth and productivity of okra plant cv. Betra . The experiment included 9 treatments i.e. the interaction of three concentrations of ascorbic acid ( 0 , 50 and 100 mg.L-1 ) and three concentrations of humic acid ( 0 , 1.5 and 3 ml.L-1 ) spraying were applied twice during growth season at fifteen days interval.Factorials experiment within Randomized complete Block Design ( R.C.B.D ) was used with three replications , Means were compared according to least significant difference L.S.D test at probability of 0.05 . Results can be summarized as follow: The use of concentration 100 mg. L-1 of ascorbic acid had a significant effect on all vegetative growth parameters ( plant length , leaves number , branches number, stem diameter , shoot fresh and dry weights) compared with control treatment ( sprays with distilled water ) which gave the least means values . Humic acid spraying with 3 ml. L-1 had a significant effect on all vegetative growth parameters compared with control treatment . Interaction between the two factors gave a significant effect on all vegetative growth .100 mg.L-1 of ascorbic acid had a significant effect on all root growth parameters ( root length , main roots number , root fresh and dry weights) compared with control treatment which gave the least means .Humic acid spraying with conc. 3 ml.L-1 had a significant effect on all root growth parameters compared with control treatment . The use of 100 mg.L-1 ascorbic acid had a significant effect on some chemical charcterstictis and yield (total chlorophyll content in leaves, total soluble carbohydrate content in leaves and yield of plant) compared with control treatment which gave the least means. Humic acid spraying with conc. 3 ml. L-1 had a significant effect on some chemical characteristics and yield of plant compared with control treatment which gave the least values. Interaction between both factors showed significant effect on some chemical characteristics and yield of plant.

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