Analysis of scots pine (Pinus sylvestris L.) seedling survival depending on sowing time after microwave sterilisation of substrate
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| Authors: | Krzysztof Słowiński1 1Department of Forest Works Mechanization, Faculty of Forestry, Agricultural University Al. 29-Listopada 46, 31-425 Kraków |
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| Abstract : | Soil sterilisation has a great influence on planting stock quality and quantity due to significant accumulation of infectious material, especially in permanent forest nurseries. In the experiment microwave oven was used as a tool for disinfection of samples in small pots (volume 330 cm3 each). Peat substrate and mineral soil were used during disinfection. Scots pine (Pinus sylvestris L.) was chosen for seedling survival analyses as this tree species is the most common one in Polish forests and its seedlings are susceptible to diseases caused by damping-off fungi. In the experiment a negative influence of microwave radiation on seedling survival was observed. Seedlings in the pots sown shortly after disinfection died or had poor vitality. In the case of the peat substrate, faster germination and lower mortality was observed in pots sown after 30 days since the treatment. Soil pots in general were characterised by higher mortality of seedlings than the pots with peat. High concentration of infectious material in soil samples quickly killed all the seedlings in the control group. Microwave radiation had a negative impact on seedlings growing on the soil substrate, if the seed were sown too early. In the pots sown on the day of disinfection only 60% of seeds germinated and only few seedlings survived until the end of experiment. Results show that the grace period is longer for the substrate based on peat and lasts 30 days, whereas for mineral soil it lasts 23 days. Sowing at the appropriate time led to a significant increase in the number of seedlings. |
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| Keywords : | disinfection, microwaves, forest nursery, soil sterilisation | ||||||||
| Language : | English | ||||||||