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The present study was conducted to select cotton stable cultivars with high productivity across various environments. Nine Egyptian cotton cultivars were grown in a split-plot randomized complete block design with three replications consisted of six different environments (2 years × 3 sowing dates) to identify the high yield stability cultivars under these conditions. Pooled analysis of variance for; number of bolls/plant, seed cotton yield and lint yield revealed significant differences due to cultivars, environments and their interactions. Results revealed that the cultivars Dandara and Giza 90 were considered as superior cultivars under different environmental conditions due to their high number of bolls/plant, seed and lint yield traits across different environments when compared with grand mean for these traits beside acceptable stability parameters (bi near to one, S 2 di non-significant, α stability value not significantly differed from zero and the λ statistic was not significantly differed from one). Therefore, it could be used in breeding programs for development of high yield stable genotypes across environments for future use. Also, principal component analysis (PCA) showed that Dandara and Giza 90 cultivars were located near all studied traits and environments (stable cultivars over different environments). According to our results the two cultivars (Dandara and Giza 90) can be recommended to be uses under a wide range of environmental conditions and use in breeding programs for development of high yield stable genotypes across environments for future use.

Four promising varieties of sugarcane, along with the commercial variety, GT54/9 were evaluated for yield, yield components, and quality traits. The environments were different ages of harvest time (11, 12, and 13 months old) of two plant cane crops (2-years) at El-Mattana Agriculture Research Station farm during (2018-2019 and 2019-2020 seasons). The stability analysis of studied traits was performed. The results indicated that the promising varieties, environments, and their interaction had a highly significant effect on all studied traits in both the seasons except the age at the harvest time on purity in both seasons, the effect of the interaction on sucrose as well as a pol in second season only and on fiber in the first season only. It is obvious from the results that none of the tested varieties was superior to GT 54/9 for cane and sugar yield and stable implying the necessity of widening the genetic base to produce improved promising varieties. The stability analysis showed that GT 54/9 variety was stable for stalk height, stalk diameter, brix, reducing sugar, and fiber and recorded the highest cane yield and sugar yield. G2003/49 was stable for cane yield, sugar yield, brix, pol, and fiber. It ranked third in cane yield and the second sugar yield. The variety G2003/47 was stable for stalk diameter, sucrose, sugar recovery, and fiber and ranked fourth for cane yield and the third rank for sugar yield. G2004/26 was stable for stalk diameter, cane yield, reducing sugar, and fiber. It occupied the second and third ranks for cane yield and sugar yield respectively. G84/47 variety was stable for cane yield, sugar yield, brix, sucrose and fiber and ranked last for cane and sugar yield.

The proper amount of fertilizer application is the main factor affecting thegrainyield and itscomponents of durum wheat.

Two field experiments were conducted in two successive seasons of 2015/2016 and 2016/2017 at the Research Farm Al-Kawthar, Faculty of Agriculture, Sohag University, to determine the effect of two planting dates (15 November and10 December) and three nitrogen fertilizer levels (50, 75 and 100 kg N/fed.) on yield and its components of four bread wheat genotypes (Sids 12, Giza 168, NGB 6404 and NGB 10893). A randomized complete block design (RCBD) in split-split plot with four replications was used. Data indicated that the planting dates were significantly effects on all studied traits except spike length and straw yield in both seasons, as well as nitrogen fertilizer levels and genotypes had significantly effect on the all studied traits; plant height (cm), spike length (cm), 1000-grain weight (g), grain yield (ard./fed.), biological yield (ton/fed.), straw yield (ton/fed.) and harvest index(%) in the both seasons. Increasing N up to 100 kg/fed increased yield and its attributes of wheat in both growing seasons except plant height (cm), spike length (cm) and harvest index (%). Sids 12 and NGB 10893 genotypes produced the highest values of grain yield compared to other genotypes in both seasons. Moreover, NGB 10893 accession produced the maximum values of spike length (cm) and1000-grain weight (g) in both seasons, while NGB 6404 accession produced the tallest plants. Late planting (10 December) increased significantly plant height (cm), spike length (cm), 1000-grain weight, grain yield (ard./fed.), biological and straw yields (ton/fed.).In general the highest grain yields (21.59 and 21.04 ard./fed.) were obtained by Sids 12 genotype when planted in 10 December and application of 100 kg N/fed., and NGB 10893 genotype when planted in 10 December and fertilized with 75kg N/fed. interaction treatments, respectively.

The experiment was conducted in the Agronomy Department, Faculty of Agriculture, Sohag University, Egypt in winter season of 2019/2020 to identify the most appropriate wheat genotypes to water stress. Ten bread wheat genotypes (3 Egyptian cultivars and 7 imported accessions (were screened under osmotic stress with three drought stress treatments induced by PEG-6000 (polyethylene glycol) i.e. control, 5% and 10% PEG-6000 solutions. The analysis of variance indicated significant differences among treatments for all recorded germination parameters (GP, GIT, GMT, GDT, SP, MDG, MTG, GC, GV and GVI). Where GP, SP, GC, GV and GVI were decreased under low water potential, while the drought stress caused retarding of germination process, continued in long period, acted in increasing of GIT, GMT, GDT, MDG and MTG.Significant interactions revealed that wheat genotypes responded variably to osmotic stress treatments. Hence, that is provided better opportunity to select drought tolerant cultivars at germination stage. Tow genotypes; G3 and G10 (Misr 1) were very good tolerant to drought stress at 5% PEG and ranked as 1 st and 2 nd order, respectively. They produced the highest germination vigor, so the seedling will be in regular growth. In the severe stress induced by 10% PEG treatment, the genotype G3 was more superior more than the others in all germination parameters. In the end we can recommend the genotypes G3 and G10 (Misr1) for drought stress conditions with modify their seeding rates ((100/GP in stress conditions) x optimal seeding rates).

to study the effect of Nanomicronutrients fertilizer on yield and quality of sugar beet varieties under normal and late sowing conditions. The results showed the early sowing at 21 st October increased the root, quality, sugar and root yields comparing with the late sowing at 21 st November in both seasons. The foliar application of Nano fertilizer treatments affected significantly all studied traits, the foliar application at 60 days after sowing exhibited the higher values of all studied traits comparing with both of foliar application at 105 days and non-fertilizer in both seasons. The four sugar beet varieties (Nabila, Karta, Kosmas and Tesla) differed significantly on all studied traits in the two seasons. Tesla variety was superior than the others of all studied traits. All interaction effects showed significant differences for root fresh weight, sucrose, TSS, purity, root and sugar yields. The highest sucrose % (18.32 and 18.42%) and sugar yield (5.20 and 5.83ton/fed) were obtained from Tesla variety with Nano-fertilized at 60 days from sowing of early sowing in 21 st October in 2016/2017 and 2017/2018 seasons respectively. According to principal component analysis, the most appropriate sugar beet varieties for selecting of sugar yield was Tesla variety under the most treatments of foliar Nano-micronutrients in both environments (stable genotype and recommended for the test environments), especially under D1 (sowing at 21 October ) and F2 (spraying time of 60 day after planting).

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