In this study, the effect of crown heating on the cultivation environment, budding, flowering and yields of strawberry was analyzed. In December, January, and February, when the outside temperature was low, the average strawberry crown temperature at daytime in the test zone was 1.3°C higher than that in the control zone, and the average strawberry crown temperature at nighttime in the test zone was 2.7°C higher than that in the control zone. The average bed temperature at daytime in test zone was 1.7°C higher than that in the control zone, and the average bed temperature at nighttime in test zone was 2.4°C higher than that in the control zone. As a result of performing correlation analysis and regression analysis on strawberry crown temperature and budding period, the correlation coefficient was -0.86, which tended to be shorter as the crown temperature was higher, and the determination coefficient was 0.74. The total yields of strawberry during test period were 392.6 g/plant for test greenhouse and 346.0 g/plant for control greenhouse respectively. As for the quality of strawberries, the ratio of 2L (very large) grades and L (large) grades was 62.4% in the test greenhouse and 58.5% in the control greenhouse, indicating that the proportion of high quality strawberries was higher in the test greenhouse.

Experiments of local cooling and heating on crown and root zone of forcing cultivation of strawberry ‘Seolhyang’ using heat pump and root pruning before planting were conducted. During the daytime, the crown surface temperature of the crown local cooling treatment was maintained at 18 ~ 22oC. This is suitable for flower differentiation, while those of control and root zone local cooling treatment were above 30oC. Budding rate of first flower clusters and initial yields were in the order of crown local cooling, root zone local cooling and control in root pruning plantlet and non pruning plantlet, except for purchase plantlet. Those of root pruning plantlet were higher than those of non pruning plantlet. These trends were evident in the yield of the first flower cluster until February 14, 2018, and the effect of local cooling and root pruning decreased from March 9, 2018. The budding rates of the second flower cluster according to the local cooling and root pruning treatments were not noticeable compared to first flower cluster but showed the same tendency as that of first flower cluster. In the heating experiment, root zone local heating(root zone 20oC+inside greenhouse 5oC) and crown local heating(crown 20oC+inside greenhouse 5oC) saved 59% and 65% of heating fuel, respectively, compared to control(inside greenhouse 9oC). Considering the electric power consumption according to the heat pump operation, the heating costs were reduced by 55% and 61%, respectively.

본 실험은 ‘설향’ 딸기에서 정식날짜와 정식전 단근처리 및 정식후 굴취처리가 생육, 출뢰율 및 수확량에 미치는 영향을 조사하였다. 60~70일 묘령의 모종을 9월 7 일, 9월 14일, 9월 21일 정식하였고 단근처리는 전체 뿌리의 25%, 50%를 각각 잘라내어 무처리와 비교하였다. 굴취처리는 9월 7일 정식한 묘를 10일후 굴취한 다음 재정식한 것과 20일후 굴취하여 재정식한 것을 비교하였다. 정식일이 늦을수록 지상부 생육이 억제되고 수량이 감소하였다. 정화방과 액화방 출뢰는 다소 앞당겨지는 경향이었다. 단근처리와 굴취처리는 지상부 생육이 억제되고 수확량이 감소하는 경향이었고 25% 보다 50% 처리구에서 더욱 확연하게 보였다. 단근처리시 정화방과 액화방 출뢰일은 무처리에 비해 늦추는 경향을 보인 반면 정식 20일후 굴취처리에서 액화방 분화를 약 7일 정도 앞당길 수 있었으나 수확량은 무처리에 비해 낮은 결과를 보였다. 따라서 액화방의 분화를 앞당기기 위해서는 강한 근권부 스트레스가 필요할 것으로 판단되나 수량과 생육을 낮추는 요인으로 작용하므로 재배시 신중한 판단이 요구된다.