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Effect of Harvesting Time and Drying Temperature on Soybean Seed Quality
Hossein Sadeghi, Hossein Heidari Sharifabad, Aidin Hamidi, Ghorban Nourmohammadi, Hamid Madani,
Volume 2, Issue 2 ((Autumn & Winter) 2016)
Abstract

In order to evaluate the effect of seed moisture content at harvesting time and drying temperature on soybean seed germination characteristics, an experiment was conducted as factorial (2×3×2) based on Randomized Complete Block Design with three replications in Karaj and Moghan areas. The first factor was cultivar with two levels (Williams and L17), the second factor was seed moisture content with three levels (15, 20 and 25%) and the third factor was drying temperature with two levels (30 and 45 °C). Results show that the germination percentage of producing seeds in Karaj (81.3%) were higher than Moghan area (77.4%). The difference between the germination percentage of dried seeds at 30 and 45◦C with initial seed moisture content of 15% was about 5.5%, while this difference for seeds with 25% initial moisture content was about 18.5%. There was no significant difference between seedling vigor index of seeds with 15% moisture content of two cultivars that have been produced in Karaj, but at 20% moisture content, the seedling vigor index in Williams cultivar (139.7) was higher than L17 cultivar (107.3). The highest (51.42 µsm cm-1 g-1) electrical conductivity of seed leakage soluble was obtained from the L17 cultivar with 25% moisture content and 45◦C and the lowest (28.46 42 µsm cm-1 g-1) rate of it was observed in Williams cultivar with 20% moisture content and 30◦C. According to these results, we must harvest and dry soybean seeds at 30◦C when its moisture content reached under 20%.


The Effect of Seed Size on Maize (Zea mays) Germination Characteristics in Vitro
Mehri Khesht Zar, Mehran Sharafi Zad, Jafar Ghasemi Ranjbar,
Volume 4, Issue 1 ((Spring and Summer) 2017)
Abstract
To investigate the role of seed size on maize germination characteristics, an experiment was conducted in 2014 in the Laboratory of Registration and Certification of Seeds and Plants, Khuzestan Branch. Treatments included three levels of seed size (control (mixed), large and small) and hybrids at three levels (KSC704, Karun and Mobin). The results of these experiments showed that the hybrid had a significant impact on germination percentage, the rate of germination, vigor index, root and shoot length and dry weight of seedling. In addition, the highest germination (94.3%), the rate of germination (8.4 seeds per day), vigor index (37.6), shoot length (21 cm), root fresh weight (3.1 gr) and dry weight of seedlings (0.59 g) affected by seed size belonged to the Karun hybrid. Generally speaking, in terms of germination and seedling growth, there were differences among the three groups of maize seeds. Out of the hybrids scrutinized, Karun hybrid was a better one in terms of germination and growth of seedlings.

Highlights:
  1.  Due to higher storage capacity, the use of large seeds brings about increases in the seedling germination rate and their establishment in the field
  2. The use of large seeds with more seed vigor decreases competition between seedlings and reduces vapor from the field.

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