9480 research outputs found
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Genotypic variation in rice tolerance to iron toxicity: insights from Bangladesh
No full textReceived: March 31st, 2025 ; Accepted: July 20th, 2025 ; Published: August 5th, 2025 ; Correspondence: [email protected] (Fe) toxicity is a major abiotic stress affecting rice production, particularly in acidic soils. Although not well-documented in Bangladesh, Fe toxicity is becoming a significant agronomic concern due to rising concentrations in irrigated soils. This study aimed to assess the tolerance of 18 rice genotypes to Fe toxicity stress based on morphophysiological and yield-related traits. A pot experiment was conducted at Gazipur Agricultural University, Gazipur, using a completely randomized design with three Fe levels: control (0 mg L⁻¹), Fe1 (600 mg L⁻¹), and Fe2 (1,200 mg L⁻¹). Results showed that increasing Fe2+ concentrations significantly affected plant height, tillering ability, chlorophyll content, and grain yield. At Fe2, total tillers per hill declined by 65.8%, and effective tillers reduced by 35.5% compared to the control. Panicle length and the number of filled grains decreased, while unfilled grains increased, indicating reproductive stage Fe stress. The SPAD chlorophyll index declined by 21.3% under Fe2, reflecting Fe-induced chlorosis. Grain yield exhibited a sharp reduction of 46.3% under Fe2, highlighting the detrimental impact of Fe toxicity on productivity. Genotypic variations were observed, with BU line 5 exhibiting the highest grain yield (0.92), effective tillers hill-1 (0.89), and lowest unfilled grains per panicle (1.26), suggesting superior tolerance. Multivariate analysis grouped genotypes based on the stress response, identifying BU line 5, BU line 13, and BRRI Dhan 28 as promising Fe-tolerant candidates. These findings highlight the critical need to breed Fe-tolerant rice varieties to mitigate yield losses in Fe-affected soils. Further research on the genetic and molecular mechanisms of Fe toxicity tolerance will facilitate breeding programs for stress-resilient rice varieties, ensuring food security in regions prone to Fe toxicity stress
Iron content and qualitative composition in a waterlogged agricultural soil under long-term agrogenic influence, Western Ukraine
No full textReceived: June 25th, 2025 ; Accepted: September 12th, 2025 ; Published: October 3rd, 2025 ; Correspondence: [email protected], a typomorphic element of hydromorphic and semi-hydromorphic soils, significantly influences soil formation processes. Despite being relatively well studied, there is a lack of data on the content of its mobile compounds in Albic Pantostagnic Luvisol. Therefore, the study's main objective is to determine the amount, profile distribution, and seasonal dynamics of Fe compounds in a waterlogged agricultural soil subjected to different levels of long-term anthropogenic influence. Research conducted in a long-term stationary experiment shows that the composition of mobile forms of iron in Albic Pantostagnic Luvisol is dominated by the oxide form Fe3+. The highest Fe3+ content (160.6 mg kg-1) was found in the humus-eluvial layer of the control soil without fertilizer, while Fe2+ compounds reached 46.6 mg kg-1 at рНKCl 4.30. Long-term application of an organo-mineral fertilization system combined with liming by hydrolytic acidity reduced the content of mobile iron compounds to 128.0 mg kg-1, of which Fe2+ accounted for 12.64 mg kg-1 at рНKCl 5.45. Under an identical fertilization system with liming by pH buffering capacity, the Fe2+ content was 28.0 mg kg-1, with a total content of 118.0 mg kg-1 and рНKCl of 5.54. In the natural conditions of forest and fallow land, the highest contents of mobile iron were 231.7 and 383.1 mg kg-1 in the 0–20 cm horizon with a significant predominance of Fe3+ compounds, 210.1 and 366.3 mg kg-1, respectively
Assessment of the spatiotemporal changes of saline-alkaline soils using GIS and, geospatial technologies methods: a community case study
No full textReceived: March 13th, 2025 ; Accepted: June 19th, 2025 ; Published: July 3rd, 2025 ; Correspondence: [email protected], in many countries, soil salinization is recognized as one of the primary land degradation processes, particularly in arid regions, where it significantly limits soil fertility and worsens ecological conditions. The widespread occurrence of solonetzic soils, including soda-type saline-alkaline soils, along with the intensification of salinization under changing climatic conditions and anthropogenic pressure, highlights the urgent need to update data on their distribution and expansion trends. This study, conducted between 2020 and 2022, presents the results of a survey of 600 hectares of saline soils in the Mrgashat settlement, Armavir Region, Republic of Armenia (center coordinates: 44° 5′ 14.36″ E, 40° 7′ 14.57″ N). A quantitative and qualitative assessment of the current state was carried out using GIS and remote sensing data, alongside soil sampling from six designated points. Newly salinized areas over the past 10 years were mapped, and the dynamics and direction of salinization were analyzed. The validity of the findings was corroborated by field survey data and relevant statistical indicators. The results indicate a clear trend of spatial and temporal expansion of salinized soils. Over the last two decades, the total salinized area has increased by 54 hectares, representing a 10.1% growth
Viitna Pikkjärv
No full textPhytoplankton biomass, diversity and abundance in samples collected from Viitna Pikkjärv during the period 1932-2000
Nohipalo Valgjärv
No full textPhytoplankton biomass, diversity and abundance in samples collected from Nohipalo Valgjärv during the period 1957-2001
Laose Valgjärv
No full textPhytoplankton biomass, diversity and abundance in samples collected from Laose Valgjärv during the period 1979-1996
Assessment of consumer awareness regarding the implementation of innovative food packaging
No full textReceived: February 3rd, 2024 ; Accepted: April 11th, 2025 ; Published: April 14th, 2025 ; Correspondence: [email protected] packaging fulfills many practical functions. They protect against harmful external factors and facilitate transport, distribution on the market, and storage of products in households. They also provide information on food products' type and composition, preparation method, and shelf life. The important role played by packaging contributes to their continuous improvement. An example of this improvement is the implementation of innovative solutions, including active and intelligent packaging. The question remains whether consumers know about these innovative facilities and whether they use them. In search of an answer to this question, a survey was conducted on 210 respondents in the Mazovian region (Poland). The survey aimed to assess consumer knowledge and awareness of active and intelligent food packaging. The study was conducted using the CAWI (Computer-Assisted Web Interview) method. As many as 79% of respondents did not know the term active packaging. It was similar in the case of intelligent packaging - 79% of respondents did not know this type of packaging. Respondents also showed a low level of knowledge regarding the different types of inserts in active packaging and examples of benefits offered by intelligent packaging. The survey results suggest the need to disseminate knowledge and benefits related to active and intelligent packaging
Jalase Bog
No full textPhytoplankton biomass, diversity and abundance in samples collected from Jalase Bog during the period 1991 and 1995
Seasonal and farm-specific variations in milk fat percentage: impact on quality and economic performance in dairy production
No full textReceived: May 9th, 2025 ; Accepted: August 18th, 2025 ; Published: August 28th, 2025 ; Correspondence: [email protected] study investigated the seasonal dynamics of milk fat percentage and its economic implications across 83 small-scale dairy farms in the Istog region of Kosovo over one year. A total of 1,616 valid raw milk samples were collected and analyzed twice monthly per farm using the Gerber method. The average annual milk fat content was 3.75%, ranging from 2.90% to 4.00%. Statistically significant monthly differences were observed (Friedman test, p < 0.001), with May showing the highest average fat percentage (3.807 ± 0.133%) and August the lowest (3.682 ± 0.220%). While Spearman’s correlation did not indicate a significant relationship between ambient temperature and milk fat percentage, seasonal comparisons revealed significantly higher fat values in spring than in winter (p = 0.009, rrb = 0.543). Farm-level analysis showed considerable variation, with fat content ranging from 3.35% to 3.92%, likely reflecting differences in general management practices and potential variations in breed and feeding. An economic model based on €0.075 per 1% fat per liter of milk and an annual production of 36,000 liters per farm revealed income disparities of up to €1,539 per year due to fat percentage differences. These findings underscore the importance of improving farm-level practices and implementing seasonal management strategies to stabilize milk fat content and reduce economic losses, particularly during warmer months when fat levels tend to decline. Future research should further investigate the specific effects of cow breed, feeding regimes, and environmental management on milk composition
Valik Eesti õietolmu värve : taskuabiline mesinikele
No full textMesilased koguvad õietolmu paljudelt taimeliikidelt, kuid enamasti
külastavad nad iga kogumisretke jooksul ühte liiki. Seetõttu esindab
iga suirakorvi kogutud õietolmutomp peamiselt ühte taimeliiki ning
homogeense värviga õietolmutompude kogumi botaaniline päritolu on
määratletav selle värvuse järgi.
Käesolev taskuabiline mesilaste kogutud õietolmutompude värvidest on
koostatud selleks, et toetada mesinikke ja loodushuvilisi õietolmu
päritolu visuaalsel määramisel. Eesmärgiks on pakkuda kiiret ja
praktilist ülevaadet taimeliikidest, millelt mesilased õietolmu koguvad,
tuginedes tompude iseloomulikule värvitoonile ja vastava liigi õitsemisajale.Käesolev taskuabiline on valminud Eesti Maaülikooli ja Eesti
Mesinduskogu koostöös ja põhineb Euroopa Liidu Euroopa Põllumajanduse
Tagatisfondi kaasrahastatud 2024. aastal teostatud
projektil „Eesti õietolmu uuring“ (L240010PKEL (MS-24-7-TA))