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Showing 4 results for Sowing Dates
Volume 1, Issue 2 (3-2015)
Optimum leaf area index (LAI) is necessary to decrease in soil surface evaporation, to intercept maximum radiation and to increase in dry matter production and seed yield. In order to study the development of leaf area in canola (B. napus) and its relationship with seed yield, this experiment was conducted at agricultural research station of Gonbad during 2005-7. The experiment was a RCBD arranged in a split-plot in two conditions, i.e. supplemental irrigation and rain-fed. Five sowing dates (SD) (Nov. 6, Dec. 6, Jan. 4, Feb. 5 and Mar. 5) assigned as main plots and two cultivars (Hyola 401 and RGS003) as subplots. In all treatments, the number of leaves on main stem and LAI increased till the beginning of seed filling, and then decreased considerably due to sever shedding of leaves. LAI at the beginning of seed filling stage, varied from 6.1 in Nov. 6 to 3.1 at Mar. 5 SDs in supplemental irrigation conditions, and from 5.2 on Nov. 6 to 2.4 at Mar. 5 SDs in rain-fed conditions. The better early growth of Hyola401 compared to RGS003 cultivar caused that, in each year and conditions, LAI of Hyola401 was significantly more than RGS003 at the beginning of stem elongation and budding. The strong relationships between the number of leaves on main stem and LAI at different growth stages and seed yield, showed the positive effects of these traits on seed yield.
Azade Vaseghi, Saeid Davazdahemami,
Volume 2, Issue 2 (3-2016)
Niger seed (Guizotia abyssinica Cass.) is a multipurpose plant that has imported to Iran as a bird seed and doesn't have any scientific report in Iran. In order to evaluate the agronomic and physiological characters of Niger seed (as an oil seed and medicinal plant) in different seasons and sowing dates, some acts such as authentication of this species was done. Niger seed has been sown in autumn, spring and summer. Also in summer the effect of sowing date in a completely randomized design with 4 replications and 3 treatments (9 June, 21 June and 3 July) was evaluated in Isfahan province in 2010. According to the results, autumn and spring were not suitable season of cultivation of this plant and it can be grown in summer successfully. The effect of various summer sowing date, on most of the measured traits were significant. The best planting date was about the third planting date in Isfahan climatic conditions. The highest value of the number of capitula per plant (59.07), 1000 seed weight (3.39), seed yield per hectare (874.7 kg), number of seeds per plant (1510), seed oil (47.33) were obtained from the third sowing date. While the highest plant height (150.1cm), days to 50% flowering (67), days to 80% maturity (110) was recorded from the first sowing date.
Valiollah Rameeh, Mohammad Aghabozorgi,
Volume 3, Issue 1 (9-2016)
In order to determine the appropriate sowing dates, seed rates and their interaction effects on yield and yield components, oil and protein contents of soybean variety Sari, a split-plot experiment based on a randomized complete blocks design with four replications was carried out at Qaemshahr Gharakeil Agriculture Research Station in 2009. Five sowing dates including 15th May, 31th May, 15th June, 1th July and 16th July were considered as main plots and three different seed rates including 60, 75 and 90 kg ha-1 as the sub-plots. The results showed that all of yield components were affected by sowing dates and also seed rates had a significant effect on the number of pods per plant. Although due to increasing seed rates, yield components, such as pods per plant were decreased, but because of the increasing number of plants per square meters, seed yield not decreased significantly. Therefore for economically saving 60 kg ha-1 of seed rates will be preferred. In this study high mean value of seed yield, biological yield and 1000-seed weight was achieved in first sowing date and all of the yield component characters were decreased in late sowing dates. Harvest index was increased in late sowing dates and it was not significantly affected by seed rates. Sowing dates and seed rates had not significant effects on oil and protein percentages, but due to significant effects of sowing dates on seed yield, oil and protein yields were significantly affected by sowing dates. In this study higher seed yield was belonged 60 kg ha-1 of seed rate in first and second sowing dates which have not significant statistically differed.
Mohammad Reza Moradi Telavat, Zohreh Kazemi, Seyyed Ataollah Siadat,
Volume 3, Issue 1 (9-2016)
A field experiment was carried out to study the yield, quality and some morphological traits responses of spring canola (Brassica napus L.) to boron application and sowing date, in Ramin Agriculture and Natural Resources University of Khuzestan in 2013-2014. The experiment was carried out as a split plots design in basis of RCBD with three replications. Planting dates (18 November, 3 December, 17 December and 30 December) and boron application treatments (control, 10 kg B.ha-1 incorporated with soil, boron spraying at 6 leaf stage and budding stages) were investigated as main and sub plots, respectively. Planting dates and boron application had significant effects on morphological traits, yield and quality of canola. The interaction effect of sowing date and boron on grain number per siliquie was significant. Late planting caused to significant decreased yield and its components. However, boron application incorporated with soil caused to compensate the negative effect of late planting. Generally, the highest grain yield (4579.7 kg.ha-1) was obtained from sowing at 18 November and 10 kg boron.ha-1 incorporated with soil, and lowest grain yield was obtained from planting at 30 December and without boron application. Delayed planting result in lowering morphological traits including plant height and branching. Delayed planting also caused by decreased grain oil and leaf N percentage, and increased grain N percentage. Boron application caused by significant plant boron content, but had no significant on grain oil ad N, and leaf N content. Also, boron application, in the experiment had no significant effect on alleviation of yield loss due to delayed canola sowing.