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Articles by E. Pazira
Total Records ( 2 ) for E. Pazira
  F. Rajabzadeh , E. Pazira , M.H. Mahdian , S. Mahmoudi and M. Heidarizadeh
  The objective of this study was to study the desalination and desodification of sugarcane fields in Khuzestan plain. Leaching experiments were conducted on seven sites and intermittent ponding method was implemented for an applied water depth of 100 cm. Among four models fitted to desalinization and desodification estimations, an exponential model with a correlation coefficient of 0.735 and significance level at 1% was selected. In the second model, initial, final and equilibrium salinity, leaching efficiency and moisture content were considered and the fitted exponential model with R2 = 0.758 was determined as the best desodification. A simulation model called leaching process was developed to determine the amount of water and time needed for reclamation of the whole soils of the study area. Two scenarios were presented: scenario I contained initial leaching, barely cultivation and leaving plant residual during warm seasons, scenario II proposed initial leaching and heavy disk operation and then a pre-irrigation operation. Considering lowering consumed water depth for the soil reclamation and also higher yield in the first scenario, scenario I was selected as a best choice.
  M. Rostaminia , S. Mahmoodi , H.T. Gol Sefidi , E. Pazira and S.B. Kafaee
  This study addressed the reduction-oxidation potential in paddy soil during rice-growing season and chemical properties of soil profiles in a semiarid area of Iran. Different stages of this research including field studies, laboratory analysis and interpretation of data had done by using of Excel and SPSS programs. Redox potential (Eh) and pH were measured at soil and water depths using a portable pH meter with Pt and glass electrode. The average of pH in surface horizons of all profiles before submerging was 7.57, but this average in the rice-growing season becomes 7.19. The average of cation exchange capacity of all profiles was 20.8 Cmol (+) kg-1 and the mean of calcium carbonate percent in control section depth of all soils were more than 40%. Measured values of Eh shows that Eh values in surface depths are more than subsurface layer (45 cm deep). The most Aerobic conditions in of 1-cm depth with Eh +440 mV and the most reduction conditions in 15 and 45 cm depths the Eh was +4.5 and -222 mV, respectively. The results of the date correlation analysis shows that there is a reciprocal significant relationship between times of submergence and the mean of Eh of all depths and the mean of pH in surface depths (r = - 0.600, p = 0.003, r = - 0.747, p = 0.000, respectively). Also there is a significant relationship directly between the mean Eh and the mean pH of surface depths(r = +0.897, p = 0.000).
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