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Sirvi Autor "Ingver, Anne" järgi

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  • Pisipilt
    Kirje
    Impact of farming system, pre-crop and weather conditions to yield and quality of spring wheat
    (Eesti Maaülikool, 2020) Ingver, Anne; Loit, Evelin (advisor); Tamm, Ilmar (advisor); Hakala, Kaija (opponent)
    Present thesis studies the impact of farming system, pre-crop and weather conditions to yield and quality of spring wheat. The main objectives were: (i) to determine the effect of six leguminous pre-crop species (perennial red and alsike clover, biennial Washington lupine, white sweet clover and the less commonly used annual Alexandria and crimson clover) on grain yield and quality characteristics of subsequent spring wheat compared to other cereals and to select the optimal leguminous pre-crops for spring wheat cultivation in organic conditions; (ii) to compare grain yield and quality characteristics of spring wheat varieties in organic and conventional conditions; (iii) to investigate the impact of weather (precipitation, sum of effective temperatures, sun hours) on yield, length of growing period, and protein content of spring wheat cultivated in conventional conditions over a period of 29 years. The results showed that the yield of spring wheat increased significantly after all the leguminous pre-crops, even after the annual species crimson clover and Alexandria clover. Six leguminous pre-crops had different impact on quality. A significant increase of the protein content was measured only after perennial species (alsike clover, red clover and Washington lupine. All the pre-crops, except crimson clover, increased volume weight and all the legumes increased TKW. The reaction of spring wheat to different management systems was the most sensitive among the spring cereals. In organic conditions the average grain yield of wheat constituted only 64% compared of that of the conventional yield. Protein content was the most influenced by farming system and was lower in the organic trial for spring wheat. The other quality characteristics (TKW and volume weight) were less influenced by the management regime. The hypothesis that increased yearly fluctuations of weather conditions over a 29 year period negatively impact yield and protein content of spring wheat was partly correct. Both stress conditions, drought and excess precipitation, caused decrease of yield. Spring wheat yields differed more than twice during the years. The highest yields were obtained mainly in years when the amount of precipitation was not significantly above or below the mean and the sum of the effective temperatures did not significantly exceed the average. Negative correlation between yield and protein content was found. The protein content of spring wheat increased during the drier and warmer years, and the average content met the highest quality requirement in more than half of the years.
  • Pisipilt
    Kirje
    Liblikõielised haljasväetiskultuurid, nende väetusväärtus ja kasutamisvõimalused suviteraviljadel mahe- ja tavaviljeluse tingimustes
    (Eesti Maaülikool; Maaelu Teadmuskeskus, 2026) Bender, Ants; Tamm, Sirje; Tamm, Ülle; Ingver, Anne; Tamm, Ilmar
    Field experiments conducted at the Centre of Estonian Rural Research and Knowledge evaluated six leguminous green manure crops grown as independent crops within an organic crop rotation. The pre-incorporation biomass (dry matter t/ha) and the corresponding plant nutrients (N, C, P, K kg/ha) were determined. The fertilizing value of green manure was assessed on spring cereals (barley, spring wheat, oats, two varieties of each) in the year following incorporation, based on the changes in yield, yield quality and thein contribution to the realizable market value per hectare. The experimental results showed that all green manure species significantly increased spring cereal yields per hecatre and improved most of the quality indicators, to an extent that allowed spring wheat and oats to be marketed as food grain, thereby enabling a higher sale price. Variety choice was an important factor. Spring wheat and barley responded well to red and pink clover used as green manure, with yield increases of approximately 60%, while annual, biennial and perennial legumes sown as green manure had a similar fertilizing effect on oats, resulting in yield increase of 30–40%.