M.H. Najafi Mood; A. Alizadeh; K. Davari; M. Kafi; A. Shahidi
Abstract
This experiment was conducted based upon a factorial split plot design consisting of three factors: salinity with three levels (2.2, 5.5 and 8.3 dS/m), irrigation with four levels (50%, 75%, 100% and 125%), cultivars with two levels (Varamin and Khordad). There were three replicates for each treatment ...
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This experiment was conducted based upon a factorial split plot design consisting of three factors: salinity with three levels (2.2, 5.5 and 8.3 dS/m), irrigation with four levels (50%, 75%, 100% and 125%), cultivars with two levels (Varamin and Khordad). There were three replicates for each treatment combination. Salinity was considered as main plot while the other factors were arranged as sub plots in the experiment. Effects salinity and deficit irrigation on yield for cultivars of cotton studied with Marginal Production(MP), Marginal Rate of Technical Substitution(MRTS) and Value of Marginal Production(VMP) indexes. Also for economics analysis, optimum depth of irrigation for deficit irrigation and complete irrigation depth were determined for tow cultivar. MPI showed That in deficit irrigation condition, yield of Khordad less than Varamin, for 1 centimeter of irrigation depth. But in over irrigation level , decreasing yield of Khordad rather than Varamin. Also MPECw showed, That yield decreased 31.8 Kg/ha on Varamin and 76.5 Kg/ha on Khordad cultivars, by increasing 1 dS/m salinity of irrigation water. MRTS index showed for instant yield, when salinity of irrigation water decrease 1 dS/m, must be increase depth of irrigation, 1.68, 3.85 cm for Varamin and Khordad respectively. So that, in equal situation of irrigation water salinity, optimum irrigation depth for Khordad was rather than Varamin.Also in all of salinity levels, optimum irrigation depth, for Khordad was rather than Varamin.
A. Alizadeh; M.H. Najafimood; J. Moosavi; B. Alizadeh
Abstract
Abstract
Environmental pollution has made urban citizens to focus on landscapes. In this respect Lown is very important plant. From the other hand water resources in many arid and semi-arid region is saline. For this purpose a research was conducted to study the effect of sprinkling irrigation with ...
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Abstract
Environmental pollution has made urban citizens to focus on landscapes. In this respect Lown is very important plant. From the other hand water resources in many arid and semi-arid region is saline. For this purpose a research was conducted to study the effect of sprinkling irrigation with saline water on growth parameters of three Lown varieties. These varieties were Poa partensis, Festuca arundianca and Lolium prenne. A complete randomized block with 3 irrigation treatments and 9 replications were used. The salinity of irrigation waters were EC=2.4 and EC= 5.3 dS/m. growth parameters were followed for 7 months. After this period of time, germination rate, height of plant, dry weight of ground canopy and length of roots were measured. The results showed that Festuca is resistance to salinity while Poa could not tolerate and dried immediately after increasing air temperature.
Key words: Salinity, Sprinkling irrigation, Lown varieties, Lolium, Festuca, Poa
M.H. Najafi mood; A. Alizadeh; A. Mohamadian; J. Mousavi
Abstract
Abstract
In order to estimate the freezing depth and developing a simple and rational relationship between air temperatures at the screen and soil temperature at different depths a study was conducted during 1386. The maximum and minimum daily air temperatures (2 meter above ground) and the soil temperature ...
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Abstract
In order to estimate the freezing depth and developing a simple and rational relationship between air temperatures at the screen and soil temperature at different depths a study was conducted during 1386. The maximum and minimum daily air temperatures (2 meter above ground) and the soil temperature at 5, 10, 20, 30, 50 and 100 centimeter depths were measured at 12 stations of Khorasan Razavi province. Functional relationships were developed between air and soil temperatures for each station. Also, soil freezing depths were estimated by four standard methods. The estimated depths were compared with actual freezing depths which were measured during the year of observation. The results showed that the Finnish and Norway methods were more reliable than U.S. and SNipll – 15 – 74 methods.
Key words: Air temperature, Soil temperature,Freezing depth
