جستجوی مقالات مرتبط با کلیدواژه "phonological traits" در نشریات گروه "زراعت"

In order to investigate the yield and yield components of Guar (Cyamopsis tetragonoloba L.) genotypes to supplementary irrigation in rainfed conditions, a two-year study has been conducted in the form of split strip plots based on a randomized complete block design with three replications at stations Shirvan, Kohnehkand and Mohammadabad research stations in North Khorasan during 2019-2020 cropping years. The main factor includes irrigation levels at three levels: rainfed, two irrigations (after planting and filling seed time), and three irrigations (after planting, pod formation and filling seed), with the second factor being guar genotypes at four levels. The three Genotypes include RGC-1077, RGC-1036, RGC-1025, and Chabahar local population. Results of the combined analysis show that there has been no significant difference between genotype except in the number of days to flowering. On the other hand, the effect of supplementary irrigation treatment on yield characteristics compared to rainfed conditions is significant, though there has not been any significant difference between two and three times of supplementary irrigation. Guar seed yield in the first and second years in the Ashkhaneh region (750.5 and 219.1 kg.ha-1) outperforms Bojnourd and Shirvan. The highest grain yield (590 kg.ha-1) is obtained in the first year from double irrigation and in the second year (271.51 kg.ha-1) from three irrigations. Among the experimental genotypes, the highest grain yield belongs to the RGC-1025 genotype. In general, guar culture of the RGC-1025 genotype can be recommended in the Ashkhaneh area..

Iran is known as one of the main centers of diversity and cultivation of walnut in the world. This diversity can be considered in breeding programs. In a walnut breeding program, identification and selection of superior genotypes is an important task. This research was conducted to identify superior genotypes within the walnut populations grown in some parts of Kermanshah province during 2013-2015. Some phenological and pomological traits of 59 walnut genotypes were evaluated according to UPOV and IBPGR descriptors. Based on the obtained results, the average nut weight, kernel weight and kernel percentage were 9.31-22.35g, 4.34-11.20g and 36.91-68.29%, respectively. The highest kernel percentage (68.28) belonged to genotype Kh86. Genotype Kh65 had the highest nut weight (22.35g) and kernel weight (11.20g). Genotype Kh110 with 25 days delay in leafing in compare to the reference standard, was considered as a late leafing genotype. Genotypes Ks33 and Kh128 showed the highest percentage of homogamy (100%). The 59 studied genotypes were classified in to five clusters by cluster analysis. Finally, genotypes Kh153, Kh150, Kh149, Kh146, Kh134, Kh128, Kh127, Kh110, Kh88, Kh87, Kh86, Kh70, Kh69 Kh65, Ks42, Ks39, Ks35 and Ks29, that had better characteristics of nut and kernel, were recognized as promising genotypes.

In order to evaluate the effect of different nitrogen fertilizer levels on physiological traits, plant height, yield components, and seed yield of rapeseed genotypes a split-plot experiment based on a randomized complete block design with three replications was carried out at the Baykola Agriculture Research Station, Mazaandaran during 2010-11. Four levels of nitrogen, as urea fertilizer, including of 0, 70, 140 and 210 kg ha-1 were considered as main plots and four rapeseed genotypes including of L7, Zafar, RGS003 and Hyola401 were considered as subplots. The result of analysis of variance revealed that the traits, including number of days to flowering, number of days to end of flowering, number of days to maturity, plant height, siliques pods per plant, seeds per silique, seed yield and oil yield were significantly affected by nitrogen levels. Genotype effect was significant effect on all the traits except seeds per silique. Hyloa401 and Zafar respectively with 3831.2 and 3893.7 kg ha-1 of seed yield, and also 1638 and 1591 kg ha-1 of oil yield were classified at the same statistical group. Non significant interaction effects of nitrogen fertilizer application and genotypes were achieved for all of the studied traits, indicated that the trend of variation of these traits due to nitrogen levels were similar in all genotypes. A significant positive correlation of seed yield with the other studied the traits, except days to flowering, indicated that increasing of nitrogen level application made increasing of the traits and finally seed yield.

The Chamomile of Anthemis haussknechtii species is one of the medicinal plants which is related to the compositae family which grows as wild type in some parts of the country. Essential oils of chamomile flowers used extensively in pharmaceuticals, food, cosmetics and health. Ecological conditions have a major role in the growth, yield and quality of medicinal plants. The purpose of this study was evaluation of morphological and phonological, and qualitative traits such as: length and width of vegetative crown, plant height, flower number per plant, fresh and dry weight, time of flowering, time of harvest, essential oil percentage, essential oil yield, growth degree days during flowering and harvesting in ecological condition of Karaj twon. The experiment was conducted in a Randomized Completely Blocks Design (RCBD) with three replicates in Alborz research station. Analysis variance showed that there was significant difference between population for all traits for Anthemis haussknechtii species (p ≤0.01) except for essential oil yield which was significance at p ≤0.05. This study showed that Kohdasht and Kermanshah populations of Anthemis haussknechtii species, considered as superior population and also they flowered sooner than other populations. Result of simple correlation analysis showed that that there was significant positive correlation between essential oil yield with fresh and dry weight of foliage biomass, flower number per bush and length and width of vegetative crown and this result indicated that amount of top heading branch yield would be increased by increasing of above mentioned traits. Result of Stepwise Regression Analysis for essential oil yield as variable trait showed that yield of foliage biomass and percent of essential oil have more effective on essential oil yield.

This study was conducted in Mashhad, Iran during 2008-2010 to determine genetic variation and evatuate the quantitative and qualitative characteristics of thirteen selected sweet cherry (Prunus avium cv. Siahe Mashhad) genotypes using phenological and pomological characteristics. The results showed that selected genotypes had a wide variation in fruit traits (fruit weight, stone weight, flesh to stone ratio, soluble solid content, pH and total acid content)and phenological stages. Genotypes SH4 (March 23th) and SH21 (April 4th) had the earliest and latest blooming, respectively. All the selected genotypes were self-incompatible and fruit set formation in the open pollination between genotypes varied from 11.05 to 43.64 percent. The fruit weight also varied significantly among the genotypes. Genotypes SH7 with 9.2 g and SH1 with 4.5 g, had the highest and lowest fruit weight. The results of the present study revealed a high variation in different characteristics of these thirteen genotypes of Siahe Mashhad sweet cherry.

In order to study morphological and phonological traits and essential factors on yield, 364 soybean genotypes were studied, using an Augmented Deign with three controls and six blocks, at seed an plant improvement Institute, Karaj, Iran, in 2003-04. 24 agronomic traits were studied. Principal Component Analysis was applied to determine number of factors. The results of factor analysis showed that five factors consisted 84.37% of the total variation, considering variables, of factors phenologic factor is considered yield and its components for the height (seed quality) and productivity vigor factor, respectively. Factor analysis reduced many associated variables to only a few factors. In breeding each factor should be explained in respect to traits making that factor that contain traits such as number of pods per plants, number of pods per branch, number of seed per plant, biological yield and seed yield per plant should be considered. It is likely that genes which control number of seed per plant, may also related to the genes controlling biological yield, seed yield per plant and other related traits in this factor. Therefore, result of factor analysis could be used in plant breeding, specially for indirect selection. Applying cluster analysis, 364 genotypes were classified into three groups. Genotypes in the first and second groups were early matured with low height and yield, and medium matured genotypes, with, high yield and yield components.