期刊
AGRICULTURE-BASEL
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/agriculture12030404
关键词
EDAH; shortening internode; unmanned aerial vehicle; electric knapsack sprayer; droplet deposition
类别
资金
- National Key Research and Development Program of China [2017YFD0201300]
- Natural Science Foundation of China [31872850]
The research compared the effectiveness of applying EDAH using UAV and EKS for controlling maize lodging. Results showed that UAV had higher droplet deposition rate, while EKS had higher droplet coverage rate and uniformity. UAV had better effects on controlling maize growth, but similar effects were detected with reduced dosage. Recommendations were provided based on lodging severity and yield concerns.
Maize (Zea mays L.) lodging is an important factor limiting its yield increase worldwide. EDAH (containing 27% ethephon and 3% DA-6) is commonly used to decrease lodging. There is an urgent need to select efficient application methods of agrochemical for better spray deposition. In our research, an unmanned aerial vehicle (UAV) (15 L ha(-1) and 30 L ha(-1)) with EDAH dosages of 72 and 90 g a.i. ha(-1), and electric knapsack sprayers (EKS) (450 L ha(-1)) with dosages of 90 g a.i. ha(-1) were used to compare the droplet deposition distribution, uniformity and maize growth. According to our research, EDAH applied by UAV had a higher droplet deposition rate than EKS; EKS had a higher droplet coverage rate, deposition density, droplet distribution uniformity. At the same dosage of EDAH, the UAV had a better effect on controlling maize growth than EKS, and almost equal effects were detected when the dosage applied by the UAVs was decreased by 20%. Considering the lodging occurrence and yield, we recommend that the dosage of EDAH applied by UAVs should be 72 g a.i. ha(-1) when there is weak lodging and 90 g a.i. ha(-1) when there is heavy lodging, with a spray volume of 15 L ha(-1).
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