Volume 3, Issue 2 ((Autumn & Winter) 2017)                   Iranian J. Seed Res. 2017, 3(2): 41-55 | Back to browse issues page

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Ranjbar G, Ghadiri H. Quantification of Seedling Emergence of Kochia (Kochia indica) Affected by Temperature, Salinity and Seeding Depth. Iranian J. Seed Res.. 2017; 3 (2) :41-55
URL: http://yujs.yu.ac.ir/jisr/article-1-147-en.html
, National Salinity Research Center, Agricultural Research, Education and Extension Organization (AREEO), Yazd, Iran , ranjbar71@gmail.com
Abstract:   (11239 Views)

A controlled experiment was run to quantify emergence of Kochia indica under different temperature, salinity and seeding depth levels at Yazd National Salinity Research Center in 2013. Treatments were five day/night temperature regimes: 20/10, 25/15, 30/20, 35/25 and 40/30 °C, five salinity levels: 2, 6, 10, 14 and 18 dS m-1, and seeding depth on the surface (0 mm), 5, 10 and 15 mm. Final emergence percentage, emergence rate index and elapsed time (days) to reach 50% of the maximum emergence were measured. The results showed that the highest and lowest final emergence percentages were observed at 25/15°C and 40/30°C day/night, respectively. Final emergence percentages at salinity levels of 6, 10, 14 and 18 dS m-1were, respectively, 9, 22, 36 and 57% lower than 2 dS m-1. Final emergence percentages for 5, 10 and 15 mm seeding depths were, respectively, 30, 44 and 72% lower, as compared with the placement of seeds on the soil surface. Regression analysis showed that final emergence percentage linearly decreased with increase in salinity and seeding depth levels. However, elapsed time (days) to reach 50% of the maximum emergence (T50), increased as salinity and seeding depth increased, so that the highest T50 was obtained for 18 dS m-1 and seeding depth of 15 mm. Increase in salinity and seeding depth was associated with a significant decrease in emergence rate index. In addition, using a logistic regression equation, emergence rate of K. indica was quantified on each day after sowing for each temperature-salinity combination to predict the distribution range of the plant in these situations.

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Type of Study: Research | Subject: Seed Ecology
Received: 2015/09/21 | Accepted: 2016/06/26

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