|
|
|
|
|
| Zarina, Livija; Zarina, Liga. |
| The nutrient balance in different crop rotations under organic cropping system has been investigated in Latvia at the Institute of Agricultural Resources and Economics since 2006. Latvia is located in a humid and moderate climatic region where the rainfall exceeds evaporation (soil moisture coefficient > 1) and the soil moisture regime is characteristic with percolation. The average annual precipitation is 670-850 mm. The average temperature varies from -6.7 ◦ C in January to 16.5 ◦ C in July. The growing season is 175 - 185 days. The most widespread are podzolic soils and mainly they are present in agricultural fields in all regions of Latvia. In a wider sense the goal of the soil management in organic farming is a creation of the biologically active... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2017 |
URL: http://orgprints.org/33076/1/EGU2017-13096-1.pdf |
| |
|
| |
|
|
| Zarina, Livija; Piliksere, Dace; Zarina, Liga. |
| The data on weediness from the ongoing crop rotation experiment at the State Priekuli Plant Breeding institute were analysed on the basis of hypothesis that under-sowing in spring cereals can improve weed management. Grass/clover mixture (Trifolium pratense L. and Phleum pratense L.) as under- sowing in spring barley (Hordeum vulgare L.) was grown for one and two seasons in six field crop rotation. Numbers of weed plants in spring (BBCH 20 – 29) were recorded using 0.1 m2 big frame in 10 places; plant biomass of under-sown crops and weeds were sampled within 1.0 x 1.0 m squares after the first cut in the following year after harvesting of main crop (barley). The total of 28 weed species were registered. The most common species were Chenopodium album L.;... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2016 |
URL: http://orgprints.org/33074/1/Livija%20Zarina_conference_paper_2016.pdf |
| |
|
| |
|
| |
|
|
| Zarina, Livija; Vaivode, Aija; Zarina, Liga. |
| There started field experiments at State Priekuli Plant Breeding Institute, in cooperation with other Nordic countries research institutes from Denmark, Germany, Poland, Sweden and Finland, to fulfil tasks of Core Organic Plus project 'Weeds and Biodiversity'(PRODIVA). One of the research project hypothesis was based on the assumption that crop and variety mixtures have greater suppressive abilities against weeds than the sole crop and variety. The first results confirm this. Between the three studied oat varieties best weed suppresion show variety 'Kalli'; among the four tested spring barley varieties-'Maali’. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2016 |
URL: http://orgprints.org/30743/1/Tezes_stenda%20ref_2016.doc |
| |
|
|
|
