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http://dx.doi.org/10.7235/hort.2013.13036

Prediction of Radish Growth as Affected by Nitrogen Fertilization for Spring Production  

Lee, Sang Gyu (Vegetable Research Division, National Institute of Horticultural & Herbal Sciences, Rural Developement Administration)
Yeo, Kyung-Hwan (Vegetable Research Division, National Institute of Horticultural & Herbal Sciences, Rural Developement Administration)
Jang, Yoon Ah (Vegetable Research Division, National Institute of Horticultural & Herbal Sciences, Rural Developement Administration)
Lee, Jun Gu (Department of Horticulture, Chonbuk National University)
Nam, Chun Woo (Vegetable Research Division, National Institute of Horticultural & Herbal Sciences, Rural Developement Administration)
Lee, Hee Ju (Vegetable Research Division, National Institute of Horticultural & Herbal Sciences, Rural Developement Administration)
Choi, Chang Sun (Vegetable Research Division, National Institute of Horticultural & Herbal Sciences, Rural Developement Administration)
Um, Young Chul (Vegetable Research Division, National Institute of Horticultural & Herbal Sciences, Rural Developement Administration)
Publication Information
Horticultural Science & Technology / v.31, no.5, 2013 , pp. 531-537 More about this Journal
Abstract
The average annual and winter ambient air temperatures in Korea have risen by 0.7 and $1.4^{\circ}C$, respectively, during the last 30 years. Radish (Raphanus sativus), one of the most important cool season crops, may well be used as a model to study the influence of climatic change on plant growth, because it is more adversely affected by elevated temperatures than warm season crops. This study examined the influence of transplanting time, nitrogen fertilizer level, and climate parameters, including air temperature and growing degree days (GDD), on the performance of a radish cultivar 'Mansahyungtong' to estimate crop growth during the spring growing season. The radish seeds were sown from April 24 to May 22, 2012, at internals of 14 days and cultivated with 3 levels of nitrogen fertilization. The data from plants sown on April 24 and May 8, 2012 were used for the prediction of plant growth as affected by planting date and nitrogen fertilization for spring production. In our study, plant fresh weight was higher when the radish seeds were sown on $24^{th}$ of April than on $8^{th}$ and $22^{nd}$ of May. The growth model was described as a logarithmic function using GDD according to the nitrogen fertilization levels: for 0.5N, root dry matter = 84.66/(1+exp (-(GDD - 790.7)/122.3)) ($r^2$ = 0.92), for 1.0N, root dry matter = 100.6/(1 + exp (-(GDD - 824.8)/112.8)) ($r^2$ = 0.92), and for 2.0N, root dry matter = 117.7/(1+exp (-(GDD - 877.7)/148.5)) ($r^2$ = 0.94). Although the model slightly tended to overestimate the dry mass per plant, the estimated and observed root dry matter and top dry matter data showed a reasonable good fit with 1.12 ($R^2$ = 0.979) and 1.05 ($R^2$ = 0.991), respectively. Results of this study suggest that the GDD values can be used as a good indicator in predicting the root growth of radish.
Keywords
base temperature; growing degree days (GDD); root dry matter;
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Times Cited By KSCI : 3  (Citation Analysis)
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