الفهرس 
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Abstract
This work was carried out of private farm located in Qalabshu (31°43´40.97”N, 31°32´91.69”E), Gamasa District, Dakahlya Governorate, Egypt, during the early planting seasons in March of 2017 and 2018 seasons to study the effect of some organic manures sources and different levels of humic and fulvic acid on growth, flowering, yield and its components and chemical composition in plant and fruit of watermelon plants (Citrullus lantus L.) c.v. Romero grafted on Shantosa species. The design used was a complete randomize block system with three replicates, each of the 22 treatments was randomized with each replicate. Twenty two treatments were included as the following Table during two seasons. The obtained results could be summarized as follows: Vegetative growth parameters of watermelon plants: With the addition of humus substance as humic and fulvic acid mixed at rate of 4 kg for each with organic fertilization FYM + compost + CK, the main stem length was increased over all other treatments and recorded the highest mean values during both seasons- No of lateral stem/plant: The highest mean values comparing with all treatments under investigation recorded with application of 4 kg for each humic and fulvic acid under FYM + compost + CK in both seasons. Stem diameter. Number of leaves/plant The treatment of FYM + compost + CK mixed with 4 kg humic and 4 kg fulvic acid realized the highest values from number of leaves/plant in both seasons after 35 days and increased in 70 and 105 days. The same was true in both seasons Leaf area cm2: All treatments of organic manures mixed with humic acid at any rats increased significantly the leaf area cm2 comparing with other treatments and the highest values of leaf area cm2 was realized with FYM + compost + CK mixed with 4 kg from both of humic and fulvic acids. Fresh and dry weight g/plant: The highest average fresh and dry weight was recorded with application of FYM + compost + CK comparing with other organic treatments and control at 35, 70 and 105 days from planting during both seasons of the experiments. Also, recorded the highest mean values with application of 4 kg from each humic and fulvic acid. Chlorophyll contents (mg/g fresh weight): a stimulation effect was happened on the mean values of the chlorophyll content due to addition of 4 kg for each humic and fulvic acids coupled with FYM + compost + CK which recorded the highest values in both seasons, P and K g/100g of watermelon plants: The highest mean values recorded with the application of 4 Kg from each of humic and fulvic acid combined with FYM + compost + CK. in both seasons.Ca, Mg and Na mg/100g: Application of FYM + compost + CK with 4kg humic acid+ 4 kg fulvic acid recorded the highest values of Ca, Mg and Na mg/100g of watermelon plants. Number of male flower/plant, number of female flower/plant and sex ratio ♂/♀: FYM + compost + CK + 4 kg humic acid + 4 kg fulvic acid significantly recorded the highest values of number of female flower/plant, while number of male flower and sex ratio recorded the highest values with control compared to other treatments during both seasons of the experiments. Average fresh weight, total yield/plot as number and dry matter fruit %: Comparing with all treatments, the highest values were recorded with application of FYM + compost + CK + 4 kg humic + 4 kg fulvic in both seasons. Average fruit length cm, average fruit diameter cm, shape index and rend thickness cm: Addition of humus substances mixed with organic manure tended to significantly increase the mean values of all yield components. Such effect was more pronounced for treatment of FYM + compost + CK with humus substances (4 kg humic + 4 kg fulvic acid).Early and total yield (kg/plot and ton/fed.): The highest values of early and total yield (kg/plot and ton/fed.) realized with FYM + compost + CK + 4 kg humic acid + 4kg fulvic acid during both seasons of the experiment. Reducing sugar, non-reducing sugar and total sugar %: A stimulation effect was happened on the mean values of the previously mentioned traits due to an application of 4 kg for each humic and fulvic acids coupled with FYM + compost + CK which recorded the highest values. Licobien mg/100g, total carotenoid g/100g, vitamin C mg/100g and vitamin A IU: The highest mean values found indicated with the treatments of 4 kg for each humic and fulvic acids coupled with FYM + compost + CK during both seasons. Acidity, TSS and total carbohydrates%: The highest values in the two seasons of TSS and total carbohydrates% were recorded with application of FYM + compost + CK+4kg humic acid+4kg fulvic acid. While acidity recorded highest values with control treatments during both seasons. CONCLUSION: Excellent yields of watermelon were obtained with all the manure types at the varying rates with comparing to the control plots, which recorded the lowest yield. All the manure type used increased the growth and yield of watermelon with different sources of manure fertilizer. This also proposes that higher yields could be expected from the soils of studied experiment if the manures of applications from different sources as FYM + compost + chicken manures. In addition, of humus substances found that increase rate of humic and fulvic increased yield. Therefore, it could be concluded that mix application of FYM + compost + chicken manures in presence of 4 kg to each humic and fulvic gave high significant yield with good quality under the same conditions. Therefore, from the above results, we recommended that when the grafted watermelon is grown, the Romero variety is developed under the condition of Qalabshu and Zian district and its similar (agricultural drainage water irrigation with high salinity soil) adding a mixture of organic fertilizers and humus substances to option the best results for all growth characteristics.