Effects of Greenhouse Temperatures and Solar Irradiance Levels on the Monthly Production of Summer-Cultivated Paprika

초록

The production of summer -cultivated paprika from August to September in Korea is relatively low due to poor environmental conditions such as high temperatures starting from late June. For this reason, proper greenhouse environment management during the high -temperature period is crucial. This study aimed to analyze unfavorable environments for paprika in greenhouses during the high -temperature period that lead to low production on four commercial farms exporting paprika, two in Cheorwon-gun and two in Inje-gun, over a course of three years (2020 - 2022). Monthly averaged 24 hour -mean temperature was at 21-23 degrees C (optimum temperature for paprika growth) from June to August in all surveyed farms. However, the maximum daytime temperature exceeded 27 degrees C for 50 - 60 days continuously and the maximum nighttime temperature was over 21 degrees C.For the whole cultivation period, the greenhouse environment was divided into quartile groups: 45.5% with high -temperature (temp.) and high -integrated solar radiation (ISR) in the first quarter (Q1), 17.0% with low -temp. and high-ISR in Q2, 27.5% with low -temp. and low-ISR in Q3, and 10.0% with high -temp. and low-ISR in Q4. A period from 22 week to 24 week (mid -late July to early August) were mostly classified in Q4. Production was highest in June, decreasing from July to the lowest level in September. In September, production showed strong negative correlation with a number of hours exposed to higher temperature than 27 degrees C. Although there was no significance between production and ISR, it likely implies that low solar radiation from mid -late July to early August resulted in even lower production in September.

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