جستجوی مقالات مرتبط با کلیدواژه « صفات فنولوژیکی » 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..

Increasing grain yield is the most important goal in any breeding program. Since yield is a complex trait and involves several quantitative components with low inheritance, its direct evaluation is not usually sufficient and therefore it is suggested that its components be investigated instead. The objective of this study was grouping 60 inbred lines along with four check cultivars of wheat from the different phonological and agronomic traits, and selection of superior groups. Therefore, these lines and cultivars were examined in (8 × 8) square lattice design with two replications. In analysis of variance for the evaluated phonological and agronomic traits, significant differences were observed in the most traits that indicate high genetic diversity of these traits. Cluster analysis showed that selection of first cluster of lines for phonological traits and second cluster of lines for agronomic traits with selection for early flowering and high plant height, awn length and biomass could lead to selection of genotypes with high number of spike per plant, seed number per spike, 1000- grain weight and grain yield. As well as, because of more easily evaluation and more heritability, these traits can be recommended for indirect selection of grain yield and its components of wheat under rainfed conditions.

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 determine of the proper sowing date of steckling (rootlet) and harvesting date of seed, an experiment was conducted in Ardabil Agricultural Research Station (Alarough) in 2004- 05 growing season in split-plot in randomized complete block design arrangement with four replications. Four different planting dates viz. 5th March, 20th March, 4th April and 19th April– were allocated to the main plot and four harvest dates viz. 15, 30, 45 and 60 days to the subplots. The first harvest was conducted 15 days after 50% flowering to the subplots. Results showed that the maximum number of main stems (2.7 per plant) and lateral stems (42.4 per plant) were recorded on first and second planting dates, respectively. The plant height reduced from 128.03 cm (first planting) to 106.50 (4th planting). The highest raw seed yield and coefficient of standard seed extraction was achieved at the first planting date. The harvest date had a significant effect on raw seed yield, seed size and the percent of the empty seed. Also, the results showed that the highest raw seed yield (2735.8 kg/ha) and the percent of seeds with the size of 3.5- 4.5 mm (36.3%) was obtained from the 3rd harvesting date. The first harvesting date had the highest percent of the empty seed (17.2%). It is recommended that the beet steckling to be planted at the first possible date (in March) and the seed to be harvested at least 45 days after 50% flowering.. The total plant dry weight on first, second, third, and fourth planting dates were 389.6, 409.14, 344.9 and 300.9 g/plant, respectively. Among harvest dates, harvest at 45 days after flowering led to significant increase in plant dry weight, seed dry weight and seed yield (2735.8 kg/ha). Seeds harvested at 15 days after flowering had 60% of a normal seed size which was less than 3.5 mm (unusable) compared with seeds harvested at 45 days after flowering. Also, the highest rate of unfilled seed (%17.2) was obtained on the first seed harvest date.

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.