جستجوی مقالات مرتبط با کلیدواژه "ارقام بهاره" در نشریات گروه "کشاورزی"

The purpose of the experiment was to determine and identify new cultivars to replace them with old cultivars in two climates, cold-temperate (Alborz province) and humid warm-temperate (Golestan province).

The experiment was carried out during two years (2017-18 and 2018-19) in Alborz and Golestan provinces by using 14 spring and 10 winter rapeseed varieties in a randomized complete block design with three replications.

In Gorgan region, cultivars DK 7170, Trapper, Hyola 50, Hyola 401 and Hyola 420 had more grain yield potential with lower ADD for the beginning of flowering and more leaf area index and SPAD index compared to RGS003 cultivar (control). In the Karaj region, the new and intermediate-maturing winter genotypes (Nafis and HL3721 line) had the higher seed yield due to less ADD for the beginning of flowering and the growth period duration, more silique per plant, and higher seeds per silique, thousand seed weight, leaf area index and SPAD index (significant difference) compared to okapi variety (control).

Trapper, Hyola 50 and Delgan cultivars with seed yield ranged from 2500 to 3000 kg.ha-1for planting in Gorgan region and Nafis cultivar with seed yield ranged from 3200 to 3300 kg.ha-1 for planting in Karaj region were recognized as suitable and high potential and good substitutes for the old RGS003 and Okapi cultivars, respectively.

Water is now the main limiting factor for crop production in arid and semi-arid regions. Water-cut or irrigation interruption has been suggested as one of the main strategies agro-technique to get the most benefit from limited water resource available. In this regard, plant growth stage, time of stress induction and the genotype are the main key factors to determine the degree of success. Canola is one of the most important oil crop. It can survive some degree of water stress while there is a need for research to find the most appropriate genotypes for plantations in water-limited areas.

In order to determine the effect of water stress at the various growing stages of canola genotypes a split-plot experiment was conducted based on the randomized complete block design with three replications at the research farm of the department of plant production and genetics, Agricultural Sciences and Natural Resources University of Khuzestan, Iran during 2020-2021. Main plots included three irrigation treatments: control (without interruption of irrigation), interruption of irrigation in the beginning of the flowering stage (phenology code 60) to the formation of 50% pods (phenology code 75), and interruption of irrigation in the stage of formation of pods until harvest (Phenology code 99) in the main plots and the cultivars (Long pod, Aram, RGS 003, Jankom, Solar, Hayola 4815, Mahtab, Julius, Agamax and Sala) were arranged in sub-plots with respect to irrigation treatments. At the end of the growing season, plant height, number of branches, silique length, number of pods per plant, number of seeds per pod, 1000 grain weight, and grain oil percentage were measured. Also, after removing the marginal effect, economic performance, biological performance and harvest index were measured.

Our results revealed there was a significant interaction effect between irrigation interruption stress and genotype on all studied traits. The number of sub-branch among cultivars varies as a result of Irrigation interruption stress. The genotypes of the long pod and Hayola 4815 had the highest number of branches compared to other genotypes when irrigation was interrupted at the flowering stage up to 50%, while when applied stress at the stage of flowering up to harvest, genotype, solar exhibited the highest number of sub-branch. The lowest number of sub-branches in all interruption of irrigation and control treatments was obtained by Jankom genotype. The mean comparisons in the conditions without irrigation interruption (control) the highest percentage of seed oil was obtained from Solar (48.3%), Hayola 4815 and 4815 (46.3%), stress application in flowering stage up to 50% sowing of a long pod (45%) and Hayola 4815 (43%) genotypes in the sowing stress to harvest the highest percentage of seed oil from Sala and Long pod genotypes with average (44.3%) the lowest percentage of seed oil in all present treatments belonged to Jankom genotype. In the present study, the highest (2093.8 kg.ha-1) and the lowest (540 kg.ha-1) grain yield and the highest (986.51 kg.ha-1) and the lowest (191.21 kg.ha-1) grain oil yield in both conditions without irrigation interruption (control) and terminal drought stress were obtained from Hayola 4815 and Jankom genotypes, respectively.

The highest and the lowest grain yield, seed oil and biological yield were obtained from Hayola 4815 and Jankom, respectively. According to the results, Hayola 4815, long pod and Solar are highly recommended to cultivate in the regions where there is terminal water stress at the end of the growing season.

In order to evaluation of value for cultivation and use of seven new spring rapeseed cultivars (Foruzan, Mahtab, Zaman, Moj, Dalgan, Z10B, SAN14) and seven commercial cultivars of Rapeseed (Sari Gol, RGS003, Hayola 420, Hayola 308, Hayola 401, Hayola 50, and Zafar) as a Reference collection were carried out in a randomized complete block design with three replications at the Seed and Plant Certification and Registration Institute-Karaj in 2015-2016. The measured agronomic traits were including, 1000-seed weight, number of silique per plant, number of seeds per silique, oil percent, Maturity date and grain yield were determined according to the UPOV instruction. The results show that, hybrid cultivars such as Hyola 50 and Hyola 401 have the highest yield. Considering the superiority of Mahtab, Zaman and Dalgan cultivars in terms of yield and having crop value compared to other cultivars, these varieties can be introduced as new cultivars for registration and commercialization. Keywords: Rapeseed, Reference collection, Spring varieties

In order to determine the most important phenological traits influencing the increase in seed yield and their relationship with yield and yield components in spring cultivars of canola, a factorial Split plot experiment was conducted based on randomized complete block design with four replications in 2013-2014 growing season in the Research Field of Gonbad Kavous University. Treatments included four canola cultivars (C1= Hyolla401, C2= Zarfam, C3= Hyolla308 and C4= RGS003), two planting dates (D1= 20 November and D2= 30 December) and three levels of nitrogen fertilizer (N1= zero, N2= 50% and N3=100%). The results showed significant differences in seed yield and other traits. The highest yield in the RGS003 (4.4ton ha-1) planted on 20 November and the lowest in Hyolla308 (1.1ton ha-1), were observed using nitrogen fertilizer and in this respect they were divided into three groups: high yielding (RGS003), medium (Hyolla401 and Zarfam) and low (Hyolla308). The maximum seed filling rate (6.1g/day) for the treatment RGS003 and 100% of the recommended nitrogen fertilizer and lowest (3.7g/day) the date of 30 November was Hyo1la 308. In addition, on the date of 30 December, Hyolla308 lowest seed weight (3.52g) with 100% nitrogen fertilizers, and RGS003 had the highest seed weight (4.04g), respectively. Seed yield except in the days to flowering (r=0.70**) and 1000 seed weight (0.19g) had a significant positive correlation with the other traits.