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The aim of this study was to evaluate the growth, productivity, and tree condition of sour cherries, depending on the cultivar and soil-moisture treatment. The research was carried out at the Institute of Horticulture, Latvia University of Agriculture. Five sour cherry cultivars were investigated using drip irrigation and woodchip mulch. The following data were collected and processed: trunk cross-section area (TCSA), trunk growth intensity (TGI), fruit set, yield tree(-1) and yield efficiency as a ratio of TCSA, photosynthesis performance index, and the level of defoliation caused by cherry leaf spot after natural infection in the field. Woodchip mulch preserved soil moisture at optimal levels or higher during most vegetation seasons. Sour cherry cultivars differed significantly in terms of growth, productivity, and tree condition, and in the response to soil-moisture treatment. Most of the sour cherry cultivars responded to drip irrigation and woodchip mulch by increasing the growth and productivity of trees; however, a negative (in 'Orlica') or minimal (in 'Bulatnikovskaya') effect of mulch was observed in a few cultivars. Our study highlights the variability of sour cherry cultivars and the necessity of further research before recommendations can be made to growers.

Fruit set is a crucial stage in the process of yield formation, which is influenced by environmental factors, growing technologies and peculiarities of genotype. The aim of the study was to evaluate the quality of pollen (viability and germination capacity) and the effect of weather before and during flowering on fruit set in sour cherry cultivars ‘Latvijas Zemais’, ‘Zentenes’, ‘Bulatnikovskaya’, and ‘Orlica’. The research was carried out in Institute of Horticulture (Latvia University of Agriculture) in 2009-2016. Good pollen viability and germination was found for cultivars ‘Latvijas Zemais’ and ‘Bulatnikovskaya’. Negative effects of increasing air temperature (in the range of 7.7 to 17.5 °C) and relative humidity (in the range of 51.4 to 88.5%) was observed for all cultivars during flowering. The effects of diurnal temperature fluctuations, wind and the amount of days with precipitation differed depending on sour cherry cultivar.

Izmēģinājums iekārtots Latvijas Valsts Augļkopības institūtā 1998. gada stādījumā ar šķirnēm ‘Iputj’ un ‘Krupnoplodnaja’. 2008. gadā uzstādot VOEN seguma sistēmu, veikta ievērojama vainaga pazemināšana un atjaunošana gan variantā ar segumu, gan arī kontrolē. Dati par saldo ķiršu augšanu, ražošanu un augļu kvalitāti variantos ar segumu un bez tā iegūti no 2009. gada līdz 2012. gadam. Segums katru pavasari, sākot ar 2009. gadu, uzklāts pirms ziedēšanas un noņemts pēc ražas novākšanas. Šķirnei ‘Krupnoplodnaja’ pēc apgriešanas zem seguma bija vērojama izteikta tendence ātrāk atjaunot vainaga tilpumu, lai gan matemātiski to pierādīt neizdevās. Seguma ietekme uz ražas lielumu nebija pierādāma, lai gan tendence bija pozitīva. Variantā zem VOEN seguma iegūti vairāk realizācijai derīgu augļu. 2012. gadā, kad ķiršu ienākšanās laikā bija sevišķi daudz nokrišņu, zem seguma 85% augļu bija derīgi realizācijai, bet bez seguma tikai 53%. Segums ievērojami samazināja puves bojāto augļu daudzumu, bet putnu bojāto augļu daudzums bija atšķirīgs pa gadiem. Pirmos divus gadus to bija vairāk zem seguma, bet 2011.-2012. gada variantā bez seguma. Šajos gados ar augstu ticamību pierādījās seguma pozitīva ietekme uz augļu vidējo svaru, zem seguma tie bija lielāki. Seguma pozitīva ietekme uz šķīstošās sausnas un fenola saturu augļos bija pierādāma tikai

The content of tocochromanols and carotenoids in kernels recovered from fruit pits of six sour cherry (Prunus cerasus L.) cultivars was studied. The highest concentration was noted for γ-T (23.50–52.76 mg/100 g dry weight basis (dw)). Considerably, lower amounts compared to γ-T were detected for α-T, δ-T and α-T3 (5.74–13.33, 2.74–4.54 and 0.30–1.16 mg/100 g dw, respectively). The β-T and γ-T3 were quantified only in minor levels. The total amount of tocochromanols was in the range 41.69–63.48 mg/100 g dw. The levels of total carotenoids ranged between 0.17 and 0.39 mg/100 dw. The concentration of tocochromanols and carotenoids in kernels of different sour cherries is cultivar-dependent. A significant correlation (r = 0.985, p

A trial was established at the Latvia State Institute of Fruit-Growing to evaluate the effectiveness of woodchip mulch and drip irrigation on sour cherry growth, yield and fruit quality as compared to untreated control trees. Sour cherries are rich in biologically active compounds. Therefore the aim of this investigation was to examine the biochemical content of sour cherry fruits as influenced by growing conditions and cultivar. Fruit of the cultivars 'Bulatnikovskaya', 'Desertnaya Morozovoi', 'Latvijas Zemais', 'Orlica', 'Shokoladnica', 'Tamaris' and 'Zentenes' were analyzed for several biochemical characteristics: including soluble solids, total acids, phenolic compounds and anthocyanins. There were significant differences in fruit biochemical composition depending on cultivar and growing method. Fruit of the cultivars 'Shokoladnica' and 'Desertnaya Morozovoi' had significantly higher soluble solids content than the other cultivars. Both cultivars had a tendency to increased soluble solids content in the control treatment. The significantly highest concentrations of the anthocyanins and phenols in the fruits were recorded for the cultivar 'Tamaris'. High contents of phenols and anthocyanins were detected also in fresh fruit of the cultivars 'Shokoladnica' and 'Bulatnikovskaya'.