Rice (Oryza sativa L.) is one of the major staple food crops for about 65 % of the world's population. A rice field experiment was conducted at Tselemti district of North Ethiopia during the main wet cropping season 2015-16 and 2016-17. The current study was proposed to evaluate the adaptability and yield performance and to identify stable, high-yielding, disease-resistant and early maturing upland rice genotype(s) in local environments. Sixteen upland rice genotypes including the standard check were evaluated. The tested genotypes are both released and unreleased genotypes and gained from national rice research programs. The experiment was laid out in a randomized complete block design of three replications. Combined analysis of variance revealed significant variations in genotypes for most traits but there is non-significant for genotype by environment interaction based on the selected analyzed traits and this implied the genotypes were not affected by the environment and the superiority genotypes across environment is constant. The highest grain yield of 3.5 t ha -1 was recorded by G4-Tana (41.8 Qt ha -1 ), followed by G2-Getachew (39.5 Qt ha -1 ). So, even if the stability didn't analyzed the Genotype Tana and Getachew were relatively highest in mean grain yield across environments and hence, both genotypes could be recommended for cultivation by the farmers and this variety should be demonstrated and popularized in larger scale to make use of its merits. IntroductionRice (Oryza sativa L.) is the foremost staple food for more than 50% of the world's population. It is estimated that by the year 2025, farmers in the world should produce about 60% more rice than at present to meet the food demands of the expected world population at that time [1]. By 2025 the world population will reach eight billion people, with 80% of those are in developing countries, and these countries will require a rational and efficient production to meet the demand of this population [2]. Among the cereals of great social and economic importance in the world, highlights the rice (Oryza sativa L.), which is an energy source for two-thirds of the world population, providing about 20% of energy and 15% of the protein that human needs [3]. Between 2007 and 2010, rice consumption in Africa increased at a rate of 4.41% per year, despite the upsurge in rice price during the food crisis [4].With this rice is the staple food for more than half of the world's population, contributing over 20% of the total calorie intake of humans [5]. The leading producers of this cereal are China, India, and Indonesia which together account for over 50% of the world's total production [6]. In sub-Saharan Africa (SSA), rice is currently one of the rapidly growing food crops in production and consumption. In a span of ten years the cultivated area has almost doubled reaching 10 million hectares with current annual production of approximately 23 million tons [6]. Rice grain produced is directly used for human consumption with average per capita consumptio...

In order to evaluate the performance of improved maize genotypes, an experiment was conducted at Medebay zana and Laelay Adiabo district of North western of Tigray, Ethiopia, during 2014 and 2015 main cropping season. The experiment was laid out in a randomized complete block design with three replications. The data were recorded on plant height, ear height, number of ears/plot, plant and ear height, days to 50% anthesis, silking, maturity, grain yield and 1000 grain weight. All varieties showed significant differences with each other for all the traits studied in most environments but incase of genotype by environment combined data revealed most of the traits gave nonsignificant result and indicated better to focus and recommend on the stable genotypes across the environments. Variety Gibe-2 and Gibe-1 had the top two highest grain yield of 5114.15 kg ha -1 and 4964.96 kg ha -1 . Melkasa-6 was the early maturing variety as compared with standard checks of melkasa-2 and the remained varieties. The highest plant height and ear placement of 237.28, 120.80, respectively cm was noted in variety Gibe-1. This variety may be susceptible to lodging. These varieties had a wide genetic background, thus showing grain yield ranges from 1748 to 5114 kg ha -1 . So, generally maize variety of Gibe-1 and Gibe-2 were found most promising, which has the potential to increase the average yield of maize in Medebay zana and Laelay Adiabo districts and is therefore recommended to demonstrate for general cultivation in both districts.