Mourad, A. E. A. A. <br/><br/>
Response of some grain sorghum genotypes to water stress under sandy soil conditions  [electronic resource]. 
 استجابة بعض التراكيب الوراثية للذرة الرفيعة للإجهاد الرطوبى الأرضي تحت ظروف الأراضي الرملية. 

 - p.1305-1324. 
<br/><br/>Includes reference. 
<br/><br/> A field triaI was conducted at Ismailia Agricultural Research Station during the two successive seasons 2003 and 2004 to stody the effect of three levels of soil moisture expressed as depletion available soil moistnre (ASMD) namely wet (25-30%), Medium (45-50%) and dry (65-70%) on some grain sorghum genotypes i.e. Dorado variety, Shandaweel-6 hybrid, ICSR 92003 Line and ICSR 91022 Line. Results indicated that increasing soil moistnre stress up to 65-70%ASMD significantly decreased plant height, leaf area index (LAI) at 51, 72 and 93 days after sowing (DAS), net assimilation rate (NAR) at the first period (30-51 DAS) and crop growth rate (CGR) at all growth periods, whereas root/shoot ratio was significantly increased at 72 and 93 DAS. Sorghum stressed plants (irrigation at 65-70 % ASMD) significantly showed a rednction in head weight Iplant, grain weight/plant, 1000 kernel-weight and grain yield/fed compared with wet or medium treatments. Main while, insignificant difference was observed between wet and medium treatments for such traits. Total carbohydrate content of grains gradually decreased with increasing soil moisture stress from (25-30% ASMD) up to (65-70% ASMD). Seasonal water consumptive use (WCU), water use efficiency (WUE) and transpiration (Tr.) were gradually decreased with increasing water stress up to 65-70% ASMD (dry treatment), whereas stomatal resistance (SR) was gradually increased. Shandaweel-6 hybrid plants were the tallest whereas, those of Dorado variety were the shortest. The maximum and minimum values of LA! at all studied growth stages were obtained by Shandaweel-6 hybrid and Dorado variety, respectively. The highest values of net assimilation rate (NAR) were recorded by ICSR 92003 line at the first and third periods of growth i.e. (30-51 DAS) and (7293 ADS), respectively, whereas Shandaweel-6 hybrid showed the maximum value at the second period of growth i.e, (51-72 DAS). Shandaweel-6 hybrid recorded the maximum values of crop growth rate (CGR) at all growth periods under study. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sorghum--Effect of stress on.<br/>Sorghum--Irrigation.<br/>Sorghum--Soils.<br/>Sandy soils.