Statistical characterization of frost zones: Case of tea freeze damage in the Kenyan highlands

Kotikot, Susan M.; Flores, Africa; Griffin, Robert; Nyaga, James; Case, Jonathan L.; Mugo, Robinson; Sedah, Absae; Adams, Emily C.; Limaye, Ashutosh; Irwin, Daniel

doi:10.1016/j.jag.2019.101971

Cited by 16 publications

(10 citation statements)

References 35 publications

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“…As previously indicated, ‘frost’ and ‘freezing’ have been used interchangeably, even referring to the climatic event, but these two words have different meanings and correspond to different phenomena (Perry, 1998; Smith, 2019). Frost has two different connotations, first it is an atmospheric phenomenon that involves extremely low air temperatures (normally below the freezing point of water; i.e., 0°C) (Kotikot et al., 2020; Snyder & de Melo‐Abreu, 2005), second it is also used to refer to ice formation on the surface of soil or foliage leaving a white layer of frozen water. This occurs when air has a high‐water content, it is condensed on top of cold surfaces at the dew point and then freezes (Jacobsen et al., 2007; Savage, 2012).…”

Section: Frost As An Abiotic Stress Factor In Plantsmentioning

confidence: 99%

Chemical products for crop protection against freezing stress: A review

Román‐Figueroa

Bravo

Paneque

et al. 2021

J Agronomy Crop Science

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Most crops of economic importance are vulnerable to environmental abiotic stresses, such as drought, extreme temperatures, and salinity (Khan et al., 2017;Piticar, 2019). Temperature is a key factor that affects plant growth and development. Sub-zero temperatures can damage and even kill crops (Piticar, 2019) due to extracellular ice formation that dehydrates cells and subsequently damages membranes (Nagao et al., 2008;Thomashow, 1999), cells disruption due to fusion between cellular and intercellular membranes can occur while the ice is formed (Takahashi et al., 2018;Thomashow, 1999). Low temperature may induce photoinhibition by producing an imbalance

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Section: Frost As An Abiotic Stress Factor In Plantsmentioning

confidence: 99%

Chemical products for crop protection against freezing stress: A review

Román‐Figueroa

Bravo

Paneque

et al. 2021

J Agronomy Crop Science

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“…Regardless of environmental conditions or the specific properties of frost crystals [33,[44][45][46][47][48], different methods are suitable for different detection schemes for frost detection technology on plant surfaces. In addition to the urgent research and development trend of current frost observation equipment [49][50][51][52], the research on the application technology of frost detection has important applications and practical significance to the meteorological field and industry [53,54].…”

Section: The Importance Of Frost Detectionmentioning

confidence: 99%

A Review of Methods and Techniques for Detecting Frost on Plant Surfaces

Song

et al. 2021

Agriculture

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Severe frost usually has adverse impacts on agricultural production, resulting in crop freeze injury, poor crop yield, and crop quality reduction. Timely and accurate detection of frost plays an important role in cold damage warnings, prevention, and control. Current frost detection methods mostly use physical properties such as light, electricity, and heat, or the judge and quantify using environmental factors such as temperature and wind speed. However, it is difficult to detect and accurately identify the frosting phenomenon in real time during field trials because of the complex environment, different plant types, and interference by many factors during observation. To provide an overview of the analytical tools for scientists, researchers, and product developers, a review and comparative analysis of the available literature on frost mechanisms, correlations, and characteristics are presented in this study. First, the mechanisms of the frost formation process, frost level, and the significance of detection, are introduced. Then, the methods and techniques used to measure frost on plant surfaces are synthetically classified and further compared. Moreover, the key points and difficulties are summarized and discussed. Finally, some constructive methods of frost detection are proposed to improve the frost detection process.

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“…More research has focused on the correlation between temperature and tea yield variations. In Kenya, frequent frost occurrences had devastating effects on agricultural productivity [10], while tea yields in 2040-2070 are projected to decrease by 10% relative to 1990-2020 due to rising temperature [11]. In Assam, India, increasing monthly average temperature (above 26.6 °C) and precipitation intensity have generally negative effects on tea yield [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of multi-timescale precipitation indices on primary tea production in Baoshan, Yunnan, China

Lü

Pope

et al. 2022

Environ. Res. Commun.

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The regional economy in Yunnan, Southwest China, relies heavily on tea production. Both the quality and amount of tea production are sensitive to extreme climate events, but exactly how different timescale climate events influence tea production remains unknown. In this study, we explore the dynamic responses of tea production indices in Baoshan, Yunnan to 6 multi-timescale precipitation indices (MPIs) at lags of up to 20 years. The results are as follows: (1) Wet injury caused by precipitation during summer and autumn is a prominent threat to annual tea production in Baoshan, which leads to negative impacts on annual tea yield and raw tea price, with the impact on the latter mainly reflected in tea quality during the primary processing for black tea and green tea. (2) Annual tea yield and raw tea prices are negatively correlated with CDD (consecutive dry days) and R20 (very heavy precipitation days) at lags greater than one year. (3) Spring tea yield and raw tea price are negatively correlated with spring precipitation, but positively correlated with days in the winter-spring dormancy period of tea plant (WSDP) and precipitation in WSDP; the positive correlation of days in WSDP is the most prominent with spring tea production of the 3 MPIs. (4) Unlike other famous tea areas, lower R20 frequency in Baoshan is not associated with high rates of soil erosion, but the lack of drainage ditches in the tea garden still means that continuous precipitation or heavy rainfall are a risk to Baoshan tea production. The insights provided by this study will help farmers and other decision-makers to understand the mechanism of MPIs’ influence on tea production, inform regional responses in tea plantation management to the observed different precipitation trends, and improve future management decisions under a changing climate.

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Statistical characterization of frost zones: Case of tea freeze damage in the Kenyan highlands

Cited by 16 publications

References 35 publications

Chemical products for crop protection against freezing stress: A review

Chemical products for crop protection against freezing stress: A review

A Review of Methods and Techniques for Detecting Frost on Plant Surfaces

Influence of multi-timescale precipitation indices on primary tea production in Baoshan, Yunnan, China

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