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Ha Seon Sim,Dong Sub Kim,Min Gyu Ahn,Su Ran Ahn,Sung Kyeom Kim 한국원예학회 2020 원예과학기술지 Vol.38 No.6
The ability to predict how well crops will grow and how much fruit they will yield is important for farmers, consumers, and researchers. Advances in environmental and plant measurement equipment provide the opportunity for more data to be collected from plant growing operations, which could result in more accurate predictions. The objective of this study was to predict the strawberry growth and fruit yield using environmental and growth data collected with this equipment. The correlation coefficients of the average daily air temperature and soil temperature data for strawberry growth predictions were higher than the relative humidity, soil moisture content, electronic conductivity, CO₂ concentration, photosynthetic active radiation, and vapor pressure deficit data. The correlation coefficients of photosynthetic active radiation, vapor pressure deficit, and relative humidity for strawberry yield prediction were higher than the other environmental data and all growth data such as plant height, crown diameter, and leaf length and width. The regression model using environmental data showed high correlation coefficients with the actual yield data (R² = 0.99). These results indicate that strawberry growth and fruit yield could be predicted using environmental data.
Ha Seon Sim,Won Jun Jo,Hye Jin Lee,Yu Hyun Moon,Ui Jeong Woo,Soo Bin Jung,Su Ran Ahn,Sung Kyeom Kim 한국원예학회 2021 원예과학기술지 Vol.39 No.6
This study determined the optimal growing degree days (GDD) and cultivars of Kimchi cabbage (Brassica rapa L. ssp. pekinensis) for growth and yield during spring cultivation under shading condition. There were nine treatments, and the experiments were conducted with three GDD levels (899, 924, and 961) and three cultivars (‘Chungwang’, ‘Cheongna’, and ‘Cheongok’) under shading conditions. The process-based model of Kimchi cabbage was applied for growth and yield prediction using meteorological data regarding light, temperature, wind, precipitation, and humidity in several regions. The number of leaves of ‘Chungwang’ Kimchi cabbage was greater than that of ‘Cheongna’ and ‘Choengok’ at all planting times. Most of the growth parameters were highest in the delayed transplanting treatment than in the other transplanting times. ‘Chungwang’ Kimchi cabbage was less sensitive to high temperature during spring cultivation than the other cultivars. GDD 924 was the most optimal time to harvest under the shading condition. GDD 750-870 is considered an appropriate harvest time in the primary production regions during the spring cultivation season. If shading is performed in these regions, constant production may be possible, thus, alleviating damage from high temperature.
Ha Seon Sim,Ui Jeong Woo,Won Jun Jo,Hye Jin Lee,Yu Hyun Moon,Soo Bin Jung,Su Ran Ahn,Jung Su Jo,Sung Kyeom Kim 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Physiological disorder (calcium deficiency) of Kimchi cabbage occurred by high temperature and frequent precipitation, which leads to unexpected price fluctuations of commodities. This purpose of this study was to profile on soluble sugars, glucosinolates, and ABA catabolites contents of Kimchi cabbage leaves under extreme and moderate high temperature treatments and chitosan foliar application. At April 6, 2020, the ‘Chungwang’ Kimchi cabbage were transplanted into 625L plastic boxes filled with commercial and general soil at open-field in Wanju. Experiments were combined with three day/night temperature levels, 36/32°C (E; extreme high), 28/24°C (M; moderate high), and 20/16°C (C; control), and two chitosan foliar application (200g/L; and non chitosan foliar application). Temperature and chitosan foliar application were performed at 42 days after transplanting, and temperature treatments were maintained during 8 days in extreme weather growth simulators. The samples were collected in 4 and 8 days after commencing high temperature treatments. After 4 days of chitosan foliar application, the glucose and fructose contents of E treatment were 67.5 and 59.4 μg·g<SUP>-1</SUP>, respectively, which were higher than non application. In the chitosan foliar application treatment, the aliphatic (gluconapin and glucobrassicanapin) and indole (glucobrassicin, 4-methoxyglucobrassicin, and neoglucobrassicin) glucosinolate contents of E treatment were 151.1, 342.2, 533.1, 1627, and 1807 μg·g<SUP>-1</SUP>, respectively, which were greater than non application. The ABA, DPA, and PA contents of E treatment under chitosan foliar application were 0.0114, 1.7, and 1.0 μg·g<SUP>-1</SUP>, respectively, higher than non application. After 8 days of chitosan folir application, the gluconapin, glucobrassicin, 4-methoxyglucobrassicin, and DPA contents of E treatment were 332.0, 445.8, 2037, 2.4 μg·g<SUP>-1</SUP>, respectively, which were greater than non application. There were no effects of chitosan foliar application in M and C treatments. Results indicated that the effect of chitosan foliar application is estimated to be approximately 4 days after commencing high tempearture treatment. The application of chitosan foliar increased ABA catabolites that relieve abiotic stress, it is considered to be effective in alleviating the high temperature damage of Kimchi cabbage.