Sirvi Autor "Zute, S." järgi
Nüüd näidatakse 1 - 5 5
Tulemused lehekülje kohta
Sorteerimisvalikud
Kirje Carbon and nitrogen accumulation by agricultural crop residue under three cropping systems(Estonian University of Life Sciences, 2025) Rancāne, S.; Lazdiņš, A.; Petaja, G.; Purviņa, D.; Zute, S.; Jansone, I.; Damškalne, M.; Putniece, G.Agricultural crops produce different biomass during their growth, including varying amounts of residue which accumulate a significant amount of carbon (C) and nitrogen (N). Assimilation capacity depends largely on species, variety and growing condition. Carbon accumulation in soil contributes to both - the agricultural production and maintenance of environmental quality reducing atmospheric C and greenhouse gas emissions. In this study, the amount of plant residue left on the field by above-ground and below-ground residue and the amount of C and N accumulated in them in three different cropping systems: organic (Bio); integrated with a low input of N fertiliser (Int-low-N) and; integrated with a high input of N fertiliser (Int-high-N) were evaluated. The most commonly grown cereal crops in Latvia were tested: winter wheat (WW); summer wheat (SW); winter rye (WR); winter triticale (WT); summer barley (SB); summer oat (SO); and buckwheat (BW) as pseudo-cereal crop. The highest biomass of dry matter of total harvest residue in all cropping systems was recorded in WR: 853.3 ± 40.76 g m-2; 1,482.0 ± 105.06 g m-2; 1,628.3 ± 115.49 g m-2 - in Bio; Int-low-N; Int-high-N cropping systems, respectively. The highest amount of carbon (g C m-2) using organic cropping system was accumulated by residue of: WR (268.6 ± 28.68), BW (239.4 ± 10.50) and WW (234.5 ± 27.41). The highest amount of carbon (g C m-2) using integrated cropping system was accumulated by residue of: WR - 473.8 ± 64.9; 496.6 ± 62.54 and WT - 458.2 ± 32.57; 521.1 ± 46.26 in Int-low-N and Int-high-N, respectively. Higher proportion of root biomass cereals formed using organic cropping system.Kirje Carbon and nitrogen uptake in above- and below-ground biomass of cereal crops in the integrated farming system(Estonian University of Life Sciences, 2023) Rancane, S.; Lazdins, A.; Zusevica, A.; Zute, S.; Jansone, I.; Damskalne, M.; Zarina, L.; Korolova, J.; Maliarenko, O.A significant reduction in greenhouse gas (GHG) emissions, as well as technologies that ensure removal of CO2 from the atmosphere, are necessary to achieve the set goals for the transition to carbon neutrality. During the crop growth cycle, a significant amount of biomass is produced, and carbon (C) and nitrogen (N) are captured both by the harvested crop removed from the field and by residues left on the field. The trials were conducted to find out patterns between crop and residues while trying to figure out the amount of captured C and N. In this study data of the most widely grown cereal crops in Latvia are summarized. The data are representative, obtained in different agroclimatic conditions, they vary both by species and variety, by year and fertilizers applied. The mean amount of biomass from cereal crops left on the field was 1,070.9 g m-2 DM, besides, 906.7 g m-2 of that was made up of above-ground (AG) residues and 164.2 g m-2 of below-ground (BG) residues. On average, 471.8 g m-2 C and 14.3 g m-2 N were captured, including: 411.2 g m-2 C and 12.9 g m-2 N by AG residues; 60.7 g m-2 C and 1.4 g m-2 N by BG residues. Regularities between grain yield and residues were found, however, they were not very strong. The dataset should be enlarged to reduce uncertainty. As the data calculated from crop have a greater uncertainty, the GHG inventory should be calculated according to the average AG and BG biomass, which provide more accurate data.Kirje Evaluation of various legume species and varieties grown in Latvia as a raw material of plant-based protein products(2020) Sterna, V.; Zute, S.; Jansone, I.; Ence, E.; Strausa, E.Nutrition value of legumes has been traditionally attributed to its high protein content. Protein content of legumes is variable dependent on different species and varieties, and highly affected by environmental factors. Usually protein quality is characterized by its owns amino acid profile in nutritional point of view. Therefore, the present study was conducted to determine the protein contents and amino acid profiles of pea (Pisum sativum L), faba beans (Vicia faba L) and soya (Glycine max L) grown in Latvia and evaluate their potential for food production. Overall results of a five-year analysis (2013–2017) showed that the protein content of peas, faba beans and soybean ranged from 20.0 to 26.1%, 26.6 to 30.5% and 35.9 to 40.9%, respectively. The corresponding values of total crude fat ranged from 0.8 to 1.2%, 0.7–1.3% and 16.6 to 19.3%, respectively. Results of study showed that the protein content of peas, faba beans and soybean was not differed by growing system (p < 0.05). The percentage of essential amino acids for pea, faba bean and soya were 34 to 38%, 57 to 59% and 62 to 64% respectively. The composition of pea flakes was preserved protein content of raw material. The pea flakes has high content of lysine of 10.1 g kg-1 , phenylalanine+thyrosine of 11.6 g kg-1 and the sum of essential amino acids of 66.4 g kg-1 . In nutritional point of view, pea flakes could be product with high-quality proten composition.Kirje Influence of local extruded soybean cake and imported soybean meal on fattening pig productivity and pork quality(2020) Jansons, I.; Degola, L.; Sterna, V.; Zute, S.The aim of this study was to determine the influence of feeding local and imported soybean protein feeds to fattening pigs and examining it impact on the quality of pork. The trial was created with 40 pigs divided in two groups (20 in each). Pigs in the control group received imported soybean meal, in the trial group local farm grown in Latvia extruded soybean cake mixed in the compound feed. The diets were designed to be nutritionally equivalent. For fattening pigs each diet were available on an ad libitum basis to pens. During the study pigs were weighed three times at 84, 140 and 190 days at age. Feed consumption, pig carcass traits and meat chemical composition were determined. The final live weight in control group was 108.33 ± 2.904 kg and in trial group was 111.88 ± 2.793 kg there were no significant difference (P > 0.05). Average daily live weight gain in the all experimental period in control group was 0.779 ± 0.096 kg and in trial group was 0.822 ± 0.103 kg, there were no significant difference (P > 0.05). Feed consumption per kg of live weight in control group was 2.39 kg in trial group was 2.24 kg. Pig carcass traits and meat chemical composition were similar for both groups without significant differences (P > 0.05). Soybeans grown and processed in Latvia were equivalent to imported soybeans and gives good rates of pig growth and quality of pork.Kirje The nutrition value of soybeans grown in Latvia for pig feeding(2019) Degola, L.; Sterna, V.; Jansons, I.; Zute, S.Soybean products are excellent sources of protein for pigs because their amino acid profiles complement those of cereal grains. Soy protein is rich in the limiting amino acids lysine, threonine, and tryptophan that are present in relatively low concentrations in the most commonly fed cereal grains. Amino acids in soy protein are more digestible than amino acids in most other plants proteins, which results in less nitrogen being excreted in the manure from pigs fed diets containing soybean meal than if other protein sources are used. The phosphorus in soy products is bound to phytic acid, which has a low digestibility to pigs, but the digestibility of phosphorus in soy products may be increased to more than 60% if diets are supplemented with microbial phytase. There are no much results about nutrition value of soybean growing in Latvia. Therefore the aim of study was determined chemical composition of soybeans growing in Latvia and evaluates their potential in pig feeding. Research object were soybeans growing in Latvia. In the studied samples content of protein, fat, ash, fibre, composition of amino acids were determined and metabolizable energy were calculated. Evaluated that protein content varied from 32.7 till 40.7%, fat content was from 18.4–21.4% and significantly differed (p < 0.05) among growing places, but the sum of essential amino acids in the soy beans determined 115–125 g kg-1 , and were not differed significantly by varieties. The content of lysine in protein were determined 5.1–5.5 g 100 g -1 . Concluded that soy bean growing in Latvia provides equilibrium high metabolizable energy for pigs – from 13.2 to 17.6 MJ kg-1 and could be used in feed.