본 시험은 괘대재배를 한 ‘풍수’, ‘황금배’, ‘신고’, 그리고 ‘감천배’의 관행구와 무대재배를 한 과실에 TiO2나 Kaolin를 엽면처리 하였을 때 과실품질과 흑성병에 미치는 영향을 조사하고자 수행되었다. 1. 관행재배구는 TiO2나 Kaolin 보다 평균과중은 증가하였지만, 수량이 현저하게 감소하여 총 과실생산량은 감소되었다.2. 관행재배구에서의 ‘풍수’와 ‘감천배’의 당도는 TiO2나Kaolin 처리구 보다 높았다.3. ‘황금배’와 ‘감천배’의 과실 경도는 TiO2 처리시 가장 높았으며 Kaolin처리시도 다소 증가시켰다. ‘풍수’와 ‘신고’는 처리 간에 차이가 없었다.4. 과피색은 관행재배구에서 가장 밝은 색도를 보였다.5. TiO2와 Kaolin 처리는 품종에 상관없이 총 폴리페놀 함량을 증가시켰다.6. 엽의 흑성병 발생 억제율은 관행재배구가 ‘풍수’, ‘황금배’,‘신고’에서 낮게 나타났으며 ‘감천배’는 TiO2 처리로 100% 억제되었다.

Over the past few decades Miscanthus has been studied as a potential bioenergy crop in Europe but not much been studied in Korea although Korea has many native Miscanthus species and genetic resources. Because of their features, such as low demands of fertilizers and other agrochemicals, high water use efficiency and high productivity, Miscanthus can be cultivated in marginal lands. However, it is not known how Miscanthus can survive in saline soil and what extent Miscanthus can tolerate salt stress, one of main abiotic stresses in reclaimed lands or dry climates. Therefore, this study was conducted to investigate physiological response of Miscanthus species to salt stress and thus to establish a salt stress threshold. Miscanthus sinensis and M. sacchariflorus showed similar responses to salt stress. Chlorophyll contents, photosynthesis and plant growth were all significantly affected by salt stress. Both species were completely killed at > 100 mM NaCl. The GR50 values estimated by non-linear regression analysis with the logistic model were 116.2 mM and 63.1 mM for M. sinensis and M. sacchariflorus, respectively. These GR50 values can be used as their thresholds of salt stress. Further studies will be conducted to screen salt-tolerant Miscanthus genotypes.

Early diagnosis of crop growth at various growth stages will help to make an optimum fertilization. If we can diagnose crop growth at around the time of topdressing of N fertilizer, N fertilization can be made based on crop growth and target crop yield, which may provide economic and environmental benefits as compared with fixed rate fertilization. In this study we devised methods to diagnose rice growth non-destructively at panicle initiation stage and to determine N topdressing rate. SPAD-502, Field Scout CM1000 and Green Seeker GNDVI were used to diagnose the growth status of rice grown at different soil N fertilities. The values measured by the diagnostic equipments at rice panicle initiation stage were then regressed to rice grain yield. It was found that CM1000 and GNDVI were more efficient than SPAD to diagnose rice growth. Therefore, a multivariate model with CM1000 and GNDVI values was developed to make a decision of N fertilization at rice panicle initiation stage. In a subsequent field study, N fertilization determined by non-destructive growth diagnose by CM1000 and GNDVI, and the multivariate model could minimize N fertilizer use to achieve our target yield, resulted in significant reduction of N fertilizer as compared with fixed rate N fertilization.