Abstract
Frost events have resulted in huge economic losses in agriculture. Apple flower buds are susceptible to being damaged by cold weather in early spring, leading to reduced apple production. Applying heat is one of the most effective methods to prevent apple flower bud damage. However, growers generally determine when and how to apply heat in orchards based on their experiences and available labor force, leading to either insufficient heating or energy waste. In this study, a frost protection cyber-physical system (CPCPS) was developed to make heating decisions based on real-time ambient temperature and wind direction data. The CPCPS consisted of a real-time temperature sensing system, an angle auto-adjusted heater, and an unmanned ground vehicle (UGV) to move the heating system. The results show that the CPCPS improved protection performance during the field tests. Compared to the non-CPCPS, the CPCPS increased the percentages of canopy protected time by 198.8 % and 111.9 % in two low-temperature field tests. The outcome of the study can be beneficial for enhancing protection performance of canopies in apple orchards.
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