- 期刊
Incorporation of Solar Radiation and Temperature to Estimate Production of Field Growing Iceberg Lettuce
結合日照輻射與日溫資訊來估計結球萵苣的田間產量
摘要
Increased crop weights in response to the amount of solar radiation available have been widely studied. Research that describes the growth model of lettuce is limited. More importantly, studies estimating the production of field grown iceberg lettuce are lacking. In this study, we analyzed the effects of solar radiation on the interception and conversion in head weight of iceberg lettuce using field growing records. We constructed a quadratic regression model to estimate the radiation-to-weight ratio in relation to air temperature. Combining the data on solar radiation and air temperature during the growing period, we further estimated the head weights of the plants. The result suggested that iceberg lettuce grown in the study area achieved its highest radiation use efficiency when the mean air temperature was approximately 19.3°C during the growing days. Using the estimated growing days, it is possible to predict the harvesting date for any expected head weight using solar radiation and air temperature data. Our study provides a statistical procedure to estimate the growth of iceberg lettuce for agricultural researchers. The results suggest that probable production and harvesting dates can be determined for farmers.
並列摘要
在作物生長模式的研究上，日照輻射量能轉換成的作物增重量已經被廣泛的探討。但是關於萵苣的相關研究卻是少之又少，特別是缺少關於估計田間生長結球萵苣產量的研究。本研究利用實際田間生產資料來分析日照輻射量轉換成萵苣結球重量的效應。利用二次多項式迴歸模型估計在不同日溫下日照輻射量轉換成萵苣結球重量的比率，並且利用生長期間的日照輻射與日溫資訊來估計萵苣的結球重量。結果顯示生長期間的平均日溫在19.3℃時，研究區域中的田間萵苣有最大的日照輻射利用效率。將日照輻射與日溫資訊帶入模型中所估計出的生長日數，可以進而針對設定的採收重量來預測可能的採收日期。本研究提供了一個統計模型讓農業研究者能估計結球萵苣的生長，研究結果也能提供農作者關於產量和採收日期的資訊。