A field study was conducted with the aim to elucidate photosynthetic responses of five emmer hulled wheat (Triticum turgidum ssp. dicoccum) accessions to 30 (N-limited) and 100 kg(N) ha-1
(N-sufficient) conditions at control and drought stress (irrigation after 30-40% and 60-70% depletion of available soil water, respectively). Chlorophyll (Chl) a and Chl b concentrations of the emmer wheats remained unchanged but net photosynthetic rate and dry mass increased and decreased, respectively, when received a sufficient amount of N. Smaller drought-induced decreases in Chl concentration, membrane stability index, and dry mass were concomitant to a greater decrease in intercellular CO2 concentration of emmer compared to the durum (Triticum turgidum) and bread wheats (Triticum aestivum). The lack of negative effect of insufficient N on Chl concentration and dry mass of emmer wheat suggests that this type of wheat possesses an obvious potential for organic farming., M. Vaghar, P. Ehsanzadeh., and Obsahuje bibliografii
About 75% of water for irrigation in Bangladesh comes from groundwater. As the crop yield is directly related to quality of water used for irrigation, an assessment of groundwater suitability for irrigation is essential for the growth of food production and poverty eradication. An attempt has been made in this paper to study the suitability of groundwater for irrigation in Bangladesh. Geographic information system (GIS) is used for the processing of groundwater quality data collected from 113 locations sporadically distributed over the country and the preparation of groundwater quality maps. The result shows that groundwater of the southwestern part of Bangladesh, which comprises 22.5% area of the country, is highly affected by salinity and sodium hazards. Groundwater in 10.54% area of the country is also contaminated by Arsenic above the permissible level recommended for irrigation. and Okolo 75 % vody pre závlahy v Bangladeši pochádza z podzemných vôd. Pretože úroda priamo závisí od kvality závlahovej vody, posúdenie vhodnosti vody pre závlahy je podstatné pre produkciu potravín a odstránenie chudoby. V štúdii je prezentovaný pokus o zhodnotenie vhodnosti podzemnej vody pre závlahy v Bangladeši. Na spracovanie údajov o kvalite podzemnej vody zo 113 lokalít rozmiestnených sporadicky po krajine a na prípravu máp kvality podzemnej vody sa použil geografický informačný systém (GIS). Výsledky naznačujú, že podzemná voda v juhozápadnej časti krajiny zaberajúcej 22,5 % jej plochy je silne ohrozená zasolenosťou a obsahom sodíka. Podzemná voda na ploche 10,54 % krajiny je tiež kontaminovaná obsahom arzénu nad prípustnú hranicu pre závlahovú vodu.