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Determination of Suitable Parameters for Developing Adequate Growth Model of Pak-choi Plants
Young Yeol Cho,Jung Eek Son 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.6
Since growth and development of plants is influenced by environmental factors such as temperature and radiation, selection of suitable parameters in developing models is very important. Purpose of this study was to determine suitable parameters of in growth model of pak-choi (Brassica campestris ssp. chinensis). Expolinear function was used for developing growth model. The growth parameters of maximum relative growth rate, maximum crop growth rate and lost time in the model were described by growing degree-days (GDD) and daily photosynthetically active radiation (PAR) integral parameters. Therefore shoot dry weight per area (gㆍm?²) could be predicted using those parameters as described above. Daily PAR integral, compared with time and GDD, improved the accuracy of the model (Y=0.83ㆍX, R²=0.998***). Also shoot dry weight showed closely linear relationship with shoot fresh weight of pak-choi. From the results, we concluded that daily PAR integral was a suitable parameter for predicting the growth of pak-choi plants. The expolinear growth model developed using daily PAR in this study worked satisfactorily and could be a useful tool for optimizing farm management and controlling crop growth.
Determination of Suitable Parameters for Developing Adequate Growth Model of Pak-choi Plants
조영열,손정익 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.6
Since growth and development of plants is influenced by environmental factors such as temperature and radiation, selection of suitable parameters in developing models is very important. Purpose of this study was to determine suitable parameters of in growth model of pak-choi (Brassica campestris ssp. chinensis). Expolinear function was used for developing growth model. The growth parameters of maximum relative growth rate, maximum crop growth rate and lost time in themodel were described by growing degree-days (GDD) and daily photosynthetically active radiation (PAR) integral parameters. Therefore shoot dry weight per area (g・m-2) could be predicted using those parameters as described above. Daily PAR integral, compared with time and GDD, improved the accuracy of the model (Y=0.83・X, R2=0.998***). Also shoot dry weight showed closely linear relationship with shoot fresh weight of pak-choi. From the results, we concluded that daily PAR integral was a suitable parameter for predicting the growth of pak-choi plants. The expolinear growth model developed using daily PAR in this study worked satisfactorily and could be a useful tool for optimizing farm management andcontrolling crop growth.
조영열,이정현,신종화,손정익 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.3
The objectives of this study were to develop a growth model of pak-choi using an expolinear function and to estimate the effect of the radiation integral and planting density on the crop growth rate. The growth and yield of hydroponically grown pak-choi (Brassica campestris ssp. chinensis) were investigated at four different planting densities (27, 33, 44, and 67 plants/m2). The shoot dry and fresh weights per m2 increased with increasing planting density and could be expressed as expolinear functions based on the daily photosynthetically active radiation (PAR). A linear relationship was observed between the shoot dry weight and fresh weight, regardless of the planting density. The maximum crop growth rate and light use efficiency (LUE) increased with increasing planting density, but the lost daily PAR integral decreased. The maximum relative growth rate was not significantly different among the planting densities. Using the relative growth rate per the daily PAR integral and LUE, an expolinear growth model of pak-choi was developed. The measured and estimated shoot dry weights exhibited strong agreement with Y = 1.010·X (R2 = 0.982***) using the PAR and leaf area index as inputs. The expolinear growth model was determined to be useful for quantifying the growth and yield of pak-choi in controlled environments.
한옥규,이동진,이병군 한국국제농업개발학회 2006 韓國國際農業開發學會誌 Vol.18 No.3
계절별로 재배 및 생산에 적합한 청경채 우량품종 육종을 위한 기초 자료를 얻고자 추대성이 다른 9개의 품종을 이면교잡하여 BC1F1 세대를 작성하였고 이들을 봄 노지, 봄 하우스 및 가을 재배 등 3개의 작형으로 재배하여 계절에 따른 추대성의 유전분석을 실시한 결과는 다음과 같다. 1. 분산성분에 의해 추정한 추대성 유전은 유전자의 상가적 작용이 큰 부분우성을 나타냈으며, 봄철 재배에서는 우성 대립유전자가, 가을 재배에서는 열성 대립유전자가 많이 관여하였다. 2. 추대성과 Wr+Vr관계로 볼 때 봄철 재배에는 추대가 빠른 것이 우성으로, 가을 재배에서는 늦은 것이 우성으로 추정되었다. In order to obtain the genetic information on bolting in pak-choi (Brassica campestris L. ssp. chinensis Jusl), diallel cross was conducted using 9 cultivars, and F1, and BC1F1 hybrid lines were developed. Genetic analysis for bolting under three cropping patterns, spring at field, spring in polyethylene film house, and fall at field, was carried out. Genetic parameters estimated by the genetic variances showed that there are partial dominant with additive effects, and the dominant allele in spring and recessive allele in fall cropping, respectively were involved. It was estimated that the early bolting in spring and the late bolting in fall cropping were dominant gene effect, considering the relation of bolting and Wr+Vr.