Seed coating provides rice seeds for aerial seeding with reduced phenamacril loss and a prolonged rice seedling protection
Abstract
Abstract: Along with the increased application of unmanned aerial vehicles (UAV) in agriculture in recent years, the aerial seeding of rice has been developed and applied in China. Film-coated seeds with phenamacril have become increasingly popular for the ecological friendly prevention and control of rice seedling pests, due to their compatibility with aerial seeding methods. In this research, an analytical method for the HPLC measurement of phenamacril residue on rice seeds and seedlings has been developed. The active dose delivery of phenamacril for rice seeds and seedlings under flooding condition was studied after a seed dressing of 5% phenamacril flowable suspension (FS) and a film coating with 5% phenamacril flowable concentrate for seed coating (FSC). Results showed that the recovery rate and relative standard deviation (RSD) of phenamacril in rice seeds and seedlings were 88.31% to 107.55% and 2.54% to 9.66%, respectively. Compared to FS, FSC containing 3% of binder #1 and #11 significantly increased phenamacril residue during seed soaking for 48 h from 59.91 mg/kg to 88.47 and 88.69 mg/kg, which were even better than 5% or 8% binders used. There was no significant difference between either FSC treatment when the concentration of binder was the same, and the protection duration of phenamacril by film coating, with 3% of binder #11 used, extended to 40 d after sowing. This study showed that a coating treatment of rice seeds could effectively reduce the loss of phenamacril under flooding conditions, making it a promising seed treatment method for use in direct seeding by airplane operations.
Keywords: binder, seed coating, HPLC, uptake, phenamacril
DOI: 10.33440/j.ijpaa.20210401.150
Citation: Wang T T, Gu A Y, Teng L J, Li X L, Wang M Q, Liu P F. Seed coating provides rice seeds for aerial seeding with reduced phenamacril loss and a prolonged rice seedling protection. Int J Precis Agric Aviat, 2021; 4(1): 70–74.
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