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Title: Studies on the effects of salinity and hydrogel polymer treatments on the growth, yield production and solute accumulation in cotton and maize
Authors: El Sayedl,Hameda
Keywords: Cotton (Gossypium hirsutum, L.)
Maize (Zea mays, L.)
Salt tolerance
Photosyntetic activity
Chloroplast pigments
Free amino acid
Free proline
Issue Date: 1995
Publisher: King Saud University
Citation: Journal of King Saud University,Agriculture Science:7(2);209-227
Abstract: The effect of incorporating hydrogel polymer into sand on the development of selected crop plants grown under saline conditions has been investigated. The seeds of cotton (Gossypium hirsutum, L.) and maize (Zea mays, L.) were germinated in sand/swollen hydrogel polymer mixture (80:n 20, v:v) with added Hoagland nutrient solution, then transplanted into a range of sand/swollen hydrogel polymer com-binations (100:0, 95:5, 90:10, 85:15 and 80:20, v:v) in plastic growbags. Saline solutions containing NaCI, CaClz, and MgClz (4 000,8000,16000 & 32000 ppm) were applied to the growbags (to field capacity) twice per week, alternating with a comparable watering regime. Harvesting was carried out at the fruiting stage. Polymer incorporating reduced the effect of salinity on both species (20% > 15% > 10% > 0%). Above 4 000 ppm salinity treatments tended to reduce shoot height, leaf area, dry weight (D.W.), yield production, chloroplast pigments (chlorophyll a, chlorophyll band carotenoids) and photosynthetic activ-ity while levels of carbohydrate (monosaccharides, sucrose and polysaccharides) and nitrogenous compo-nents (total free amino acids, free proline and protein) tended to increase under saline conditions particu-larly in the presence of hydrogel polymer. In the absence of salt the proline content was 30-42 % of the total free amino acids pool; in the presence of salt up to 32 000 ppm and up to 20% hydrogel polymer the figure was 85-95%. Inorganic elements (sodium, calcium, magnesium, phosphorus and chloride) tended to decline in the presence of saline and hydrogel polymer treatments, but potassium and nitrogen tended to decline in the presence of saline and hydrogel polymer incorporated into sand treatments. Hydrogel polymer appears to be highly effective for use as a soil conditioner in saline conditions resulting in improved soil caracteristics, crop tolerance and growth in a sand substrate. It is intended to confirm the results ofthese studies by field trials.
URI: http://hdl.handle.net/123456789/875
Appears in Collections:Journal of the King Saud University - Agricultural Sciences

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