جستجوی مقالات مرتبط با کلیدواژه « کیفی » در نشریات گروه « زراعت »

Considering the increase in per capita consumption of rice in the country and the need to increase rice production per unit area, it is very important to introduce new high-quality varieties with high yield and stable grain yield. The grain yield depends on the genotype and its response to environmental conditions. To increase the quantity and quality of rice, this research was conducted to evaluate the interaction between genotype × environment and to determine the stability of the grain yield of rice genotypes.

In this experiment, 8 quality rice lines were carried out including Kadus, Ali Kazemi, and Champa local cultivars in the form of Randomized Complet Block Design with three replications in Cheram and Basht regions during 2017 and 2018. In each year, the performance of tested genotypes was tested separately using simple variance analysis and using Duncan's method, and at the end of the second year, combined analysis was performed to determine the compatibility. To analyze the stability and compatibility of lines, Shukla's stability variance, Francis and Kanenberg's coefficient of environmental changes, Wrickes ecovalence, deviation from Eberhart and Russell's regression line, Finley and Wilkinson's regression coefficient and Pintos' coefficient of identification were used.

The results showed a great diversity between the investigated genotypes in terms of grain yield and other agricultural traits. Composite variance analysis showed that there is a significant difference between years at the 5% probability level. The stability analysis of the genotypes by calculating the stability parameter shows that the highest stability was related to the local Champa variety and lines 7, 8, 5, and 6. Based on the calculated Eberhart & Russell Method, genotypes 7, 6, and 8 and the local Champa variety were favorable in both test environments. In terms of Wrickes ecovalence, and stability parameter, the local Champa cultivar and genotypes 6 and 5 were the best. Based on the results of the analysis and comparison of the average of the treatments, the superiority of the grain yield was related to lines 7 and 5 with an average yield of 9.60 and 8.85 tons per hectare. The mentioned lines were recognized as superior genotypes due to their average yield, conversion efficiency, high percentage of whole rice, and average amylose content.

Based on the results obtained from the stability methods of lines number 7 and 5, respectively, with an average yield of 9.60 and 8.85 tons per hectare and having stability variance, environmental change coefficient, and intra-location variance less than one, as well as the coefficient of the regression line equal to one they are recommended as stable genotypes for both regions and other similar regions.

In order to study the quantitative and qualitative traits of hay in flowering stage of forage vetch, under effect of different densities, an experiment was conducted at research field of Faculty of Agriculture, Lorestan University in autumn 2007. The experiment was carried out as factorial based on a randomized complete block design with three replications. In this experiment three species of vetch including (broad leaf, common and woolly pod) were studied and evaluated under three plant densities (100, 150 and 200 plant m-2). Interaction (density in species) showed the highest hay yield with 2268 kg ha-1 was produced in 200 plant m-2 by broad leaf vetch and the lowest hay yield with 724 kg ha-1 in 100 plant m-2 by woolly pod vetch. Moreover, species and density had significant effects on qualitative traits of hay (crude protein percent and yield), percentage and yield of insoluble fiber yield in neutral detergents and (density × species ) interaction as well. In this experiment plant height was under the effect of (density × species), as well as stem diameter under the effect of species.

In order to investigate the effect of sowing date and different nitrogen levels on quality and quantity characteristics of Linseed, an experiment performed in split plot in form of Randomized Complete Block Design, with 4 replication and during 2005-2006 and 2006-2007 in Yasouj Agriculture Research Station. 5 sowing date included 10 March,1,10 and 20 April and 1 May in main plots and 4 fertilizer levels in subplots included 0, 50, 100 and 150 kg/ha pure N from urea fertiliser that 50% was applied at sowing and 50% as top-dressing. The results of 2-year analysis of data indicated that with delayed sowing, plant height, number of branch, number of fruits, grain yield, 1000 seed weight, leaf area index, dry mater, crop growth rate and oil percentage were reduced significantly. The use of 100kg/ha N significantly increased plant height, number of branches, pod of fruits, grain yield, leaf area index, dry mater, crop growth. First sowing date with 1801.12 kg/ha had the most yield and fifth sowing date with 760.48 had the least yield. The most and the least yield rate of grain in 100kg/ha N and control were 1895.22 and 1351.87. The most oil was 34.6% that obtained in the first date of sowing. The first sowing date with 52.38% produced the most and the fifth sowing date with 50.58% produced the least acid linolenic. The sowing date had no significant effect on acid oleic and acid linoleic. The most acid linolenic 52.64% and acid linoleic 15.36% were obtained by the use of 150 kg/ha N and the most acid oleic 20.59% were obtained without N.