engleski

Influence of pre-sowing treatment of the narrow-leaved ash tree seed (Fraxinus angustifolia Vahl) of different origin on its nursery germination

In today's increasingly difficult living conditions, Narrow-leaved ashes are valuable wood species of our forests that deserve specific care. The difficult possibility of natural regeneration encourages us to find new solutions in production of forest reproductive material intended for management of lowland forests. Overcoming the double dormancy of the Narrow-leaved ash tree seeds is a challenge in the production of forest reproductive material and requires special attention and skill in pre-sowing treatment. Aim of the paper was to determine whether there is a difference between the two pre-sowing methods seeds on the nursery germination. Seeds originated from six different groups: Nova Gradiška, Prvča, Lipovljani, Čakovec, Cetina and clone trees by academic Mirko Vidaković. Pre-sowing tretmants are moist warm and moist cold and stratification at 3°C. Moist warm and moist cold treatment was for 6 weeks at a constant temperature of 20°C and then 16 weeks at a constant temperature of 3°C. The other procedure was stratification at a constant temperature of 3°C for 22 weeks. Quartz sand was used for pre-sowing tretmants. The ratio of seeds and sand was 1:4 with the addition of 37% water. Sowing was done on the May 9th, 2018 on nursery beds. The first seedlings appeared nine days after sowing, and the first counting of the seedlings was done on the 23rd of May, or the 14th day after sowing which represents the germination energy of the seeds. The final count was completed on the 5th of July after the end of germination period of 56 days, exactly as prescribed by ISTA rules for the genus Fraxinus spp. Counting criteria was the occurrence of cotyledons above ground. The results showed that the moist warm and moist cold process increased the total seedling germination by 27.04% compared to the stratification. The germination of seeds from Nova Gradiška, Lipovljani and Čakovec, treated with moist warm and moist cold process, was 38.90% higher compared to the same seeds that were only stratified. On the other hand, the germination of stratified seed from Prvča and Akademic Vidaković clones was 68.90% higher compared to the germination of the same seed, which went through process of moist warm and moist cold.

ISTA rules ; forest reproductive material category ; seedling ; stratification ; moist warm and moist cold process

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