Seyedahmad Kalantarahmadi; Jahanfar Daneshian; Habib Mobinirad
Abstract
In order to develop winter cultivation and improve crop rotation in the region, an experiment has been conducted to evaluate the effects of sowing date on sunflower cultivars seed yield. It is a split-plot based on completed randomized blocks design with four replications in Safiabad Agricultural and ...
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In order to develop winter cultivation and improve crop rotation in the region, an experiment has been conducted to evaluate the effects of sowing date on sunflower cultivars seed yield. It is a split-plot based on completed randomized blocks design with four replications in Safiabad Agricultural and Natural Resources Research and Education Center of Dezful and has taken place during two years (2015-2016). The main plots are consisted of four sowing date levels (23rd Jan, 6th Feb, 20th Feb, and 6th Mar), while the sub plots include nine levels of cultivars (Azargol, Armavirski, Barzegar, Progress, Record, Shams, Farokh, Ghasem, and Gabor). Delay in the sowing date has decreased growth period length and plant height, with the greatest number of seeds per capitulum (684.17) belonging to record cultivar on the first sowing date in the first year and the maximum one (767.47) occurring again to this cultivar on the third sowing date in the second year. The maximum seed yield in the first (3850 kg.ha-1) and second (4088 kg.ha-1) year belong to the first sowing date (23rd Jan) and Azargol cultivar. Based on the results, Azargol cultivar have had the lowest rank, being considered as the cultivar with the highest seed yield on all sowing dates, followed by Record and Armavirski, in the second and third placed, respectively. In terms of stability, considering that Farrokh cultivar also has had the lowest standard deviation, it has been selected as the most stable cultivar.
Seyedahmad Kalantarahmadi; Jahanfar Daneshian
Abstract
The present experiment has been carried out as a split plot based on randomized complete block design with three replications in Safiabad Agricultural and Natural Resources Research and Education Center of Dezful between 2012 and 2014. The main plots is consisted of 3 sowing dates (November 5, November ...
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The present experiment has been carried out as a split plot based on randomized complete block design with three replications in Safiabad Agricultural and Natural Resources Research and Education Center of Dezful between 2012 and 2014. The main plots is consisted of 3 sowing dates (November 5, November 25, and December 15) with the sub plots including 10 levels of foliar application (100, 200, 300 mg.lit-1 ascorbic acid, 100, 200, 300 μmol ascorbic acid, 10, 20, 30 vol% methanol, and the foliar application of distilled water as control treatment). The effect of sowing date and foliar application as well as their interaction has had significant effect on proline, soluble sugars, number of siliques per plant, and seed yield (P≤0.01). Comparing means of sowing date × foliar application shows that the maximum number of siliques per plant (68.96) has been formed in the first sowing date with the foliar application of ascorbic acid (300 mg.lit-1). There has been a significant difference between different sowing dates: the seed yield has decreased in the second and third sowing date, compared to the first one by 145% and 30%, respectively. However, foliar application of experimental treatments has increased the seed yield in all sowing dates, but it is recommended to use ascorbic acid (300 mg.lit-1) in the first and third sowing dates as well as salicylic acid (200 µmol) and methanol (10%) in the second sowing date.