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Effects of different methods of site preparation on natural regeneration of Pinus sylvestris in Eastern Poland

100%
Aleksandrowicz-Trzcinska M., Drozdowski S., Brzeziecki B., Rutkowska P., Jablonska B.
Dendrobiology
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2014
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tom 71
Mechanical site preparation (MSP) is commonly used to enable forest regeneration of clear-cuts. Less intense methods may be more suitable from an environmental point of view, but such a method can result in the lack of natural regeneration. We compare the influence of three MSP methods on natural regeneration of Scots pine. The methods differ in their degree of soil disturbance. The effects of MSP by forest plough (FP), active plough (AP), and forest cutter (FC) on density, quality, and biometric parameters of one-year old seedlings were determined. The highest density of seedlings was obtained in the FP treatment (188,000 seedlings ha–1). The seedling density was significantly lower in the AP method (121,000 seedlings ha–1), and in the FC variant (36,000 seedlings ha–1). The best quality seedlings were found in the FC variant, and the worst – in the FP treatment. Most biometric parameters of seedlings did not differ by MSP method, except for the root length and root:shoot ratio. By the end of growing season, in the FP treatment, 1-year old seedlings formed a top bud more than twice as often as the seedlings from the AP and FC treatments. The FP method led to the best Scots pine natural regeneration. The results obtained in the FC variant were not as good as in the FP method, though they were still acceptable from the silvicultural point of view. The FC method was the least intensive method of site preparation, yet it is considered the most appropriate from the environmental (soil protection) point of view.
2
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Comparison of the quality of seeding the Virginia fanpetals seeds by S071 Kruk seeder in laboratory and field conditions

100%
Kowalczuk J., Zarajczyk J., Leszczynski N., Wegrzyn A., Niedziolka I., Szymanek M., Markowski P.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2014
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tom 14
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nr 3
3
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Evaluation of biometric features and quality of seedlings from an open nursery in Dobieszyn Forest District

80%
Aniszewska M., Brzozko J., Kowalska E.
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
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2017
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nr 70
4
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Influence of varying rates of fertilizers on the performance of cacao (Theobroma cacao) seedlings in the nursery

80%
Famuwagun I. B., Oladitan T. O.
International Letters of Natural Sciences
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2016
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tom 58
Effects of application of poultry manure, organo-mineral fertilizer, NPK soil or foliar applied at varying rates on cacao seedlings were studied in the nursery between January-May 2011 and December to April, 2012. Poultry manure at 40, 50 and 60g/plant significantly influenced cacao seedlings height and number of leaves over other treatments. The effect of organo-mineral fertilizer application at 50 and 60g per plant on the number of leaves was also significantly better than NPK soil or foliar applied, starting from 12 weeks after treatment application. The stem girth development under poultry manure at 50 and 60g per plant application had the best performance followed by poultry manure at 40g per plant. There were no significant differences in almost all the treatments at 5 weeks after sowing on seedlings stem girth. NPK has the longest tap root length while poultry manure had the largest average number of lateral roots followed by organo-mineral. The results thereby indicated that the use of poultry manure at 40 to 50g per plant and organomineral fertilizer as sources of nutrients had significant effects on cacao seedling quality.
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