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Browsing by Subject "typpi"

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  • Pensas, Ari (2017)
    Barley (Hordeum vulgare L.) is one of the most important cop in the world. It is used as raw material for fodder, brewing, bakery and foodstuff industry. Barley needs nutrients and nitrogen is the most important. Barley takes nitrogen 100 to 120 kg per hectar as ammonium and nitrate, which it uses during the growing season to form biomass and leaf chlorophyll to photosynthesize. Nitrogen deficiency causes dwarfism to stem and undeveloped state to phosynthesizing leaves. Nitrogen can be applied as inorganic and organic fertilizers and also as microbe content organic mineral fertilizers. The aim of the thesis was to examine how conventionally and organically cultivated methods affected two-row barley’s yield and quality in field experiment in 2009. There were six different cultivation methods; Berner Plant protection, University of Helsinki, Nylands Svenska Lantbrukssällskap (NSL) and Raisio Agro used conventionally cultivated methods and Elosato and ProAgria Organic used organically cultivated methods. Treatmens were fertilized by nitrogen from 71 to 118 kg per hectar where conventionally cultivated treatments were fertilized by nitrogen from 85 to 118 kg per hectar and organically cultivated treatments were fertilized by 71 kg per hectar. Seed population was from 400 to 500 seeds per m2. The results indicated that NFC Tipple matured 4 to 5 days earlier in organically cultivated treatments than conventionally cultivated treatments which had an effect to grain size. Early maturing was caused by low nitrogen fertilizer amount and plant disease amount. Vigorously grown barley resulted in higher yield and better yield quality when it was conventionally cultivated in comparison to organically cultivated. Quench responded better to nitrogen fertilizer when nitrogen than NFC Tipple and Fairytale. Number and timing of fungicide treatment had no effect to Quench’s growth’s disease amount.
  • Korpi, Terhi (2019)
    The production of potato starch leads to large amount of separate cellular liquid. So far industries haven’t had use for this potato juice, and it has been distributed back to fields. This causes unnec-essary expenses for industries as well as raises the risk of nutrients leaching. These factors have raised the interest in developing processes for further processing of the cellular liquid. The main interest of industries is still potato starch, which is why they are interested in what affects the nitro-gen and protein content of starchy potatoes and what is their relationship to starch content. This study was done in unison with Perunantutkimuslaitos (Petla) during the starch potato variety test in summer of 2016. In this study the effects of four cultivational factors (site, cultivar, nitrogen fertilization level and time of harvest) were examined via the changes in nitrogen and protein levels in tubers. The weather factors were considered from the data collected from the nearest measure-ment location of the Finnish Meteorological Institute. The goal of the study was to find out what are the factors that have the biggest effect on the changes in nitrogen and protein contents of starch potato variants. Cultivars were found to have the biggest effect, but the site as well as sowing time and weather conditions had an effect as well. Correlation between starch and nitrogen content was not observed. In addition, the goal was to determine the ideal combination of cultivational factors for optimal starch, nitrogen and protein yield. Early variants do have more secure production of yield, since late variants are easier affected from different growing conditions. Raising the level of fertilization to 100 kg/ha was the optimum based on the results of this study, but only if time of harvesting was opti-mized as well.