Evaluating the Productivity of some Barely Genotypes under Deficient Water Application in Clayey Soils

Abstract

This study is intended to identify barely genotypes efficient for water use. For this, a field experiment was conducted at Sakha Research Station. The experimental design was randomize complete block with three replicates during 2018/2019 and 2019/2020 growing seasons. Twenty barely genotypes were grown under two water application treatments ((full irrigation (FI) and water stress (WS)). The values of applied irrigation water were 3430 and 1995 m3/ha under WS and FI, respectively, being lower by 42%, compared to FI amount, average over the two seasons. The interaction between barley genotypes and irrigation water revealed that plant height of line-7, spike length and number of grains/spike of line-6, number of spikes/m2 of Giza133, and grain and biological yields of line-5 were the least affected by WS, compared with their values under FI. The highest values of WUE under WS were found for line-6 and line-11, which also attained the highest WP Line-8 and line-13, expressed the highest value of mean productivity, geometric mean productivity and stress tolerance indices. Furthermore, line-7 had the highest value of stress susceptibility index. Thus, based on WUE, WP and drought tolerance indices, it could be concluded that line-6, line-7, line-8, line-11 and line-13 have the ability to withstand water stress and could be selected for breeding programs for water use efficiency.

Effect of Water Deficit on Productivity of Some Barley (Hordeum vulgare L.) Genotypes

“…The highest values in the second season may be a result of the lowest temperature and higher relative humidity than in the first one. Similar results were obtained by [5,24]. Results showed that, water deficit reduced all studied traits.…”

“…Results showed that, water deficit reduced all studied traits. These results were confirmed by [20,25,26,5]. The reduction in number of grains/spike may be due to premature abortion of florets [27].…”

“…In this regard, evaluation barley genotypes under normal irrigation compared to water stress conditions found to be effective in identifying tolerant genotypes to water deficit [23]. In this respect, significant genetic variability among the studied genotypes under seasons and water treatments were found [5]. The highest values in the second season may be a result of the lowest temperature and higher relative humidity than in the first one.…”

“…Barley possesses some special properties that enable it to adapt desirably into different unsuitable environmental conditions compared to other crops. The phenomenon of diminishing barley yields under limited water supply situations is well known [3], therefore, drought stress reduces barley grain yield by negatively affecting the yield components which are determined at various plant development stages [4,5]. Drought stress is a significant abiotic factor that can diminish photosynthesis efficiency by reducing leaf expansion, hence, causing premature leaf senescence and lower food production.…”

Comprehensive Selection Criteria for Some Barley Genotypes under Different Water Stress Treatments

“…The 2-year average WCU values were 1332, 1250, and 1208 m 3 /fed for I I 1 , I 2 , and I 3 irrigation treatments, respectively. Results agree with [18]. 3 consumed water) and WP (0.81 kg grain/m 3 applied water) were recorded for Giza 129 genotype.…”