Poiša, Liena

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Poiša, Liena
Official Name
Poiša, Liena
Alternative Name
Poisa, Liena
Liena Poisa
Poisa, L
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Email
liena.poisa@rta.lv
ORCID
Scopus Author ID
55014398000
Researcher ID
HJZ-3782-2023

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  • Publication
    MELTING TEMPERATURE BEHAVIOR OF DIFFERENT ENERGY CROP ASHES
    (2017)
    Skaidrīte Būmane
    ;
    Poiša, Liena 
    ;
    Aleksandrs Adamovičs
    ;
    Rasma Platače
    ;
    Edgars Čubars
    For solid fuels ash melting temperature is recommended to be higher than 1000°C, so that it can be used in automated furnaces; therefore-promising energy crops are investigated as renewable energy source. This paper presents the results of tests on melting temperature of different energy crop ashes.The field trial was carried out in the study farm of the Latvia University of Agriculture "Pēterlauki" (56°53'N, 23°71'E) in the sod calcareous soils characterized by pH KCl 6.7, P 52 mg kg-1, K 128 mg kg-1, organic matter content from 21 to 25 g kg-1 in the soil. Energy crops analysed: reed canary grass (Phalaris arundinacea L.), birch (Betula pendula Roth.), osier (Salix spp.), grey alder (Alnus incana (L.) Moench), poplar (Populus tremula L.), hybrid aspen (Populus tremuloides x Populus tremula). Results indicate that the ash melting temperature (D, St, Ht, Ft) for the wood energy crops were higher than for the studied grass energy crops and their mixture. Ash melting temperature in all phases over 1200°C was observed for such poplar and hybrid aspen mixture proportions: 3 parts of wood and 1 part of reed canary grass, or 1 part of wood and 1 part of reed canary grass.
    Scopus© Citations 3
  • Publication
    Assessment of Perennial Crop Areas in Latvia and Ukraine
    (2013)
    Rasma Platače
    ;
    Natalia Tsurkan
    ;
    Poiša, Liena 
    ;
    Aleksandrs Adamovičs
    ;
    Kristīne Ivanova
  • Publication
    THE EFFECT OF AN INNOVATIVE FERTILIZER OF DIGESTATE AND WOOD ASH MIXTURES ON WINTER GARLIC PRODUCTIVITY
    (2023)
    Aleksandrs Adamovičs
    ;
    Poiša, Liena 
    Garlic (Allium sativum L.) is a widespread crop in vegetable production. The popularity of garlic is due to its bactericidal and antioxidant properties. Digestate and wood ash are the by-products of cogeneration plants. The digestate is rich in nutrients, can provide a large part of the nutrients needed by the plant during the growing season, as well as improves the soil structure. Wood ash contains small amounts of phosphorus and potassium and is strongly alkaline (pH 8–12) due to the oxides in its composition, mostly calcium carbonate. The purpose of the study was to determine the effect of fertilizer rates of the digestate and wood ash mixtures on winter garlic productivity and harvest quality. Field trials with the winter garlic variety 'Lubaša' were established in sod clay, loamy soil. In the garlic plantation, different variants of fertilizer mixtures were used – they contained pig or cattle manure or plant residue digestate, and wood ash. The ratio of digestate and wood ash in the mixtures was 3:1; fertilizer rates for winter garlic were 15 and 30 t ha-1. In the study, the different types of fertilizers showed different effects on the yield and quality of winter garlic.
  • Publication
    THE EFFICIENCY OF USING ALTERNATIVE FERTILIZERS IN POTATO PLANTATIONS
    (2023)
    Aleksandrs Adamovičs
    ;
    Poiša, Liena 
    ;
    Lydiia Antypova
    Field trials with the two potato variety were carried out in sod stagnogley soil. Soil agrochemical parameters: pHKCl 6.7 organic matter (OV) content in soil 2.3%, phosphorus (P2O5) content - 149 mg kg-1 and potassium (K2O) content - 200 mg kg-1 in soil. Potato plantations were created using different variants of fertilizer mix with pig (from SIA “Latvi Dan Agro”) and cattle (from SIA “Ziedi JP”) manure digestate and wood ash (from SIA“Gren Jelgava”) in different ratio (digestate :wood ash ratio used: 4:1and 3:1). The rates of innovative mixed fertilizer for pig and cattle manure digestates for potatoes were 15 and 30 t ha-1. Both norms for digestate manure from pure pigs and cattle were used as control options. The potato production norm was 3.0 t ha-1. The placement of the variants in the trial was randomized, in triplicate. In the study, the two types of fertilizer had different effects on potato tuber yield. Using mixtures of pig manure digestate and wood ash in different ratios, the average yield was 34.2 t ha-1, but using mixtures of cattle manure digestate and wood ash, the average yield was 27.8 t ha-1. In the studied variants, its content in potato dry matter varied in the range of 9.15-11.42%. The amount of dry matter affects the culinary properties of the tubers. The application of fertilizer mixtures increased the dry matter content by an average of 1.7–2.7%. Fertilizer variants with higher tuber yield or higher starch content provided the highest starch yield.  In general, the use of mixtures of wood ash and biogas digestate to fertilize crops and improve soil fertility can be an efficient way to process both products and can be an environmentally friendly alternative to fertilizers. The objective of the research was to study the influence of digestate and wood ash mixtures fertilizer rates on potato productivity and quality.
  • Publication
    POSSIBILITIES OF WINTER CROP GRAIN’S QUALITATIVE INDICES RISE FOR BIOETHANOL PRODUCTION
    (2015)
    Poiša, Liena 
    ;
    Veneranda Stramkale
    ;
    Aleksandrs Adamovičs
    Bioethanol production is one of cereal’s using ways. COM 2003/30/EC: Directive on the promotion of the use of biofuels or other renewable fuels for transport orders that proportion of biofuels in 2010 must be -5.75% but in 2020 – 10%. The object of research is to study the influence of winter crops cultivation’s technology on quality of grain and suitability for bioethanol production. Field research was organized in the Agricultural Science Centre of Latgale from 2005 to 2008. There were researched 5 fertilizer rates and the influence of varieties on the grain yield and starch in the experiment for 3 years. Starch content, yield and the result of bioethanol have changed depended on species of cereals, varieties, growing year and fertilizer rate. It is recommended to use good quality grains with high starch content and low protein content for bioethanol production.
  • Publication
    LINSEED FOR RENEWABLE ENERGY
    (2010)
    Poiša, Liena 
    ;
    Aleksandrs Adamovičs
    ;
    Veneranda Stramkale
    ;
    Ļubova Komlajeva
    The renewable energy acquisition reduces dependence on fossil energy, which has a beneficial impact not only on agriculture but also on the country's economic development, since it has reduced the amount of bad emissions and the quantity of imports. This study is to determine the carbon content, ash content and yield influencing factors of linseed in order to clarify the possible use of alternative energy. The linseed is suitable for energy production from biomass, because it is derived from different products, which are used for solid fuel and bio diesel production.