الفهرس 
Effect of salinity on cotton growth, yield and fiber quality
MATERIALS AND METHODSOnly 14 pages are availabe for public view
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Abstract
Two pot experiments were carried out at the greenhouse of the Cotton Res. Inst., Agric. Res. Cent., Giza, Egypt during 2015 and 2016 seasons to study the response of cotton plant to application of some nutrients to improve the performance of cotton plant under irrigation of saline water to increase growth, yield and yield components and fiber quality of Giza 90 cotton cultivar. The experimental design was a split plot design with four replications. Main plots included saline water solutions treatments (control, 2000, 4000, 6000 and 8000 ppm), sub plot included four nutrients application (potassium humate, algex, poly ethylene glycol (PEG) 6000 and potassein compared with control). The obtained results could be summarized as follows: Plant height, total dry weight/plant, dry weight of bolls/plant and leaf area/plant significantly decreasing by increasing salinity levels at the three sampling dates 75, 90 and 105 days from planting in both seasons compared with the control. Nutrients application showed significant increase in plant height, total dry weight /plant, dry weight of bolls /plant and leaf area/plant at the three sampling dates. The plants which sprayed with PEG gave the highest averages of plant height and leaf area /plant at the three sampling dates and total dry weight / plant at 75 days only, while potassium humate gave the highest averages of total dry weight/ plant and dry weight of bolls /plant at the two sampling dates 90 and 105 day. The potassium humate, algex, poly ethylene glycol and potassein applications under normal and salinity stress conditions had positive effects on improving the performance of cotton plants, which increased plant vegetative growth traits especially under salinity stress conditions.
Irrigation with saline water over seasons significantly decreased plant height at harvest, number of fruiting branches/plant, number of open bolls /plant, boll weight, seed index, seed cotton yield per plant, fiber length, uniformity index, fiber strength and micronaire value, while, lint % was significantly increased. Nutrients application had significant effect on growth parameters, yield and its components and fiber properties under study, All nutrients treatments gave the highest values of growth parameters, yield and its components and fiber properties as compared with the control in both seasons. In general, plants sprayed with PEG gave the highest averages of plant height at harvest, number of fruiting branches/plant, while potassium humate gave the highest averages of yield and its components and fiber properties followed by plants sprayed with algex, while the plants sprayed with PEG as came the last in these respect in both seasons. Interaction between irrigation with slain water and nutrients application had a significant effect on plant height at harvest, number of fruiting branches per plant, boll weight, number of open bolls /plant, seed index, seed cotton yield /plant and fiber quality under study in both seasons. Plants treated with foliar nutrients under salinity condation scored the highest average of growth parameters, yield and its components and fiber properties. Potassium humate, algex, PEG and potassein applications to plants under normal and salinity conditions had positive effects on improving the performance of cotton plants, which increased plant growth, yield and fiber properties especially under salinity conditions.
Key Words: Cotton, Saline Water, Potassium Humate, Algex, Poly Ethylene Glycol, Potassein, Growth, Yield and Fiber Quality.