Showing 3 results for Jamshidian
Reza Jamshidian, Mohammad Reza Khajehpour,
Volume 2, Issue 3 (fall 1998)
Abstract
Methods of seedbed preparation affect establishment, growth and yield of crops via manipulating physical and chemical properties of soil. These effects on wheat-mungbean double-cropping have not been studied in Isfahan. Therefore, the influences of various seedbed preparation methods on soil physical properties and nutrients content and on establishment of mungbean (experimental line 1-61-16) were studied in a wheat-mungbean double-cropping system during 1996 at the Agricultural Research Station, Isfahan University of Technology. Two residue management treatments (burned and unburned) along with four tillage systems (moldboard plow, disk, khishchee and no-till) were laid out in a strip plot design within a randomized complete block design with four replications. Bulk density and penetrability of soil at various depths were not affected by residue management at emergence. However, at the time of flowering, bulk density at 0-15 cm soil depth was lower and soil penetrability at 3-15 cm depth was higher in unburned treatment due to mineralization. Rate and coefficient of emergence of seeds were lower in unburned residue treatment. Soil bulk density at 0-30 cm depths was lower and penetrability at 3-21 cm depth was higher with moldboard plowing at both emergence and flowering time. In addition, lower soil N, P and K content at 0-15 cm depth at emergence and flowering time was obtained with moldboard plowing. Rate and coefficient of emergence were strongly lower in no-till treatment. Based on these results and considering sustainable agricultural goals, incorporating residue with disk tillage might be advantageous under conditions similar to this experiment.
Reza Jamshidian, Mohammad Reza Khajehpour,
Volume 3, Issue 1 (spring 1999)
Abstract
Limited time for crop residue decomposition and complete seedbed preparation in double-cropping necessitates reduced tillage which is associated with its shortcomings. Information about seedbed preparation aspects in double-cropping of wheat and mungbean in Isfahan is lacking. For this reason, the effects of various seedbed preparation methods on growth, seed yield and yield components of mungbean (experimental line 1-61-16) were studied in a wheat-mungbean double-cropping system during 1996 at the Agricultural Research Station, Isfahan University of Technology. Two residue management treatments (burned and nonburned) along with four tillage systems: moldboard plow, disk, khischee and no-till were laid out in a strip plot design within a randomized complete block design with four replications. Improved establishment and plant growth conditions associated with burning residue treatment significantly increased plant density, above ground plant weight, number of nodes per branch, plant height, number of pods per main stem and per square meter, number of seeds per pod on main stem and on branches, number of seeds per main stem, seed yield, biological yield and harvest index. Higher plant density in this treatment resulted in significant reduction in the number of branches and number of pods per branch. Desirable conditions for establishment and growth in disk and moldboard plow treatments significantly increased plant density, above ground plant weight, number of pods per main stem and per square meter, number of seeds per pod on main stem and on branches, number of seeds per main stem, seed yield, biological yield and harvest index. No-till treatment produced the least results in respect to the above traits. The results indicated that burning residues with disk tillage system might be an appropriate seedbed preparation method under conditions similar to this experiment.
M. Jamshidian, M. A. Sahari, M. Barzegar,
Volume 10, Issue 3 (fall 2006)
Abstract
For milk fat modification, after decantation of its serum, it was fractionated at three temperature rates (30-35, 17-22 and 5-10 ºC) and times (6, 13.5, and 18 hours). After each stage, the solid phase or stearine fraction was separated from liquid phase or olein fraction by centrifugation at 1600 rpm for 15 minutes. The olein fraction was then used in the second step of fractionation. This process was repeated three times until the low, medium and high melting fractions (LMF, MMF and HMF, respectively) were isolated to 27 fractions. Iodine value (by Wejs’ method) and solid fat content (SFC by NMR) of these fractions were measured and compared. The results, showed significant differences between in IV and SFC for LMF with MMF and HMF (3-6 units or 10-20% for IV and 3-14% for SFC) it was also found that LMF, MMF and HMF could be used in ice cream, Danish pastry and ice cream coating formulations, respectively.
