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Articles by K. Ghassemi-Golezani
Total Records ( 2 ) for K. Ghassemi-Golezani
  K. Ghassemi-Golezani and R.A. Mardfar
  Water resources are limited in many agricultural areas of West Asia. So, effective use of this scarce resource is very important in this region. Therefore, this research was conducted in 2004 at the Research Farm of the Faculty of Agriculture, University of Tabriz, Iran, to investigate the effects of different irrigation regimes (I1, I2 and I3: irrigation after 60, 80 and 100 mm evaporation from class A pan, respectively) on growth, yield and yield components of three common bean cultivars (COS16, Talash and Khomain). A split-plot experiment based on randomized complete block design in three replications was used, with the irrigation levels in main plots and common bean cultivars in subplots. The results of plant growth analysis on the basis of Growth Degree Days (GDD) showed that Percentage Ground Cover (PGC), Dry Matter Accumulation (DMA), Crop Growth Rate (CGR) and Relative Growth Rate (RGR) were considerably reduced, due to water deficit. In all cultivars, the highest PGC, DMA, CGR and RGR were obtained under I1. PGC at different stages of growth under I3 was much less than that under I1. PGC for Talash was more than that for other cultivars under I3.. CGR of COS16 under well-irrigation (I1) was more than that of other cultivars, but CGR of Talash and COS16 under I3 was almost similar at different stages of growth. All three cultivars had higher RGR at early stages of growth under I1, compared to I2 and I3. However, this difference gradually decreased with increasing degree days. PGC had the practical advantage of easy, quick and non- destructive measurement. Therefore, it can be used as the best growth index for estimating crop performance in the field. Although, mean grain weight of Khomain was more than that of two other cultivars, but Talash and COS16 produced more pods and grains per plant, leading to higher yield per unit area, compared to Khomain. Drought stress led to the reduction of number of pods per plant, grains per plant and grain yield per unit area. However, differences in 1000 grains weight among I1, I2 and I3 were not significant. Yield reduction under limited irrigations was only 9.45-16.5%. These results indicate that limited irrigation can considerably overcome the deleterious effects of drought stress on field performance of common bean.
  A. Soltani , M. Gholipoor and K. Ghassemi-Golezani
  In this study, a simple theoretical framework was extended to account for the effects of temperature and atmospheric CO2 concentration on RUE. A general test of the model showed that simulated and observed daily biomass productions under average daily temperatures ranged from 11 to 28°C are similar. The calculated RUEs for 13-23°C were similar to measured ones and percentage increase in RUE for CO2 concentration of 640 ppm relative to 330 ppm was in agreement with the measured percentage increase in biomass production. By using the framework, RUE response functions to average daily temperature and CO2 concentration were calculated for chickpea. RUE of chickpea at temperatures lower than 3°C and higher than 36°C is zero. RUE rapidly increased (9.5%°C-1) with increasing temperature from 3 to 14°C. With further increase in temperature to 22°C, RUE slowly (1.4%°C-1) decreased and temperature increase between 22 to 36°C resulted in sharp decrease (7.4%°C-1) in RUE. Response of RUE to CO2 concentration was curvilinear. At low concentrations of CO2 (60 to 400 ppm), RUE was especially sensitive to increases in CO2 concentration, but increases in CO2 greater than 700 ppm were predicted to result in only small increases in RUE. The functions obtained can be used in simulation studies of chickpea crop response to projected climate change.
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