Response of some potato (Solanum tuberosum L.) cultivars to different salinity levels of irrigation water under sandy soil
Two field experiments were carried out at the Farm of Environmental Studies and Research Institute, Sadat City University, during two successive summer seasons of 2014 and 2015, to evaluate the effect of salinity water stress as four levels of salt (NaCl) i.e., fresh water, 20, 40, and 80 mMol. NaCl)) on vegetative growth characteristics, yield and its components and quality as well as the chemical composition of some potato tubers cultivars (Spunta, Desiree, Red Sun, Sophie, and Safari).Both cvs Red Sun and Spunta were significantly increased in the vegetative growth, while cv. Red Sun was significantly increased in yield and its components, while cv. Sophie recorded the lowest values of yield and its components and the highest value of dry matter content. Salinity stress significantly decreased both plant height and the fresh weight of plant, while number of branches/plant was not significantly affected between salinity levels, yield and its components, as average tuber weight, tuber yield per plant, tubers yield per fed., and chemical composition of tubers were affected especially at 80 mM compared with the control and 20mM NaCl, In addition, the results show that, the interaction between the cvs Spunta and Desiree with the control of salinity gave the highest values of vegetative growth characteristics, while cv. Red sun with the control treatment fresh water gave the highest yield, and its components, while, low vegetative growth and yield were recorded with cv. Sophie with the highest level of salinity. Chemical composition of tubers, cvs and salinity levels are not significant, except Ca% was significantly affected with second level of salinity.
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