Study on laser pre-sowing treatment of rice seeds by free-falling transport method

Recently, laser pre-sowing treatment of seed is attracting a great attention of scientific community for its positive influence to enhance germination, seedling and growth of plants, vegetables and crops. In this study, effect of laser pre-sowing treatment of rice seeds was given, which was implemented by free-falling transport method. Test has been processed in Unzon district (DPRK) in 2017. Two kinds of Korean rice seeds (namely Pyongyang-53 and Dongsung-1) were irradiated by semiconductor laser with wavelength of 650 nm, which was controlled in PWM mode. Each group was irradiated using exposure time of 0.28 s and duty ratio of 50 percent. In result, a considerable improvement has been observed in germination, growth and final productivity. Using laser pre-sowing treatment of rice seed, total productivities have been increased by 7.7% and 21% for “Pyongyang-53” and “Dongsung-1”, respectively. Results show that laser pre-sowing treatment of seed can significantly enhance germination, seedling and growth, and thus can improve the productivity of rice. In future research, laser pre-sowing treatment by free-falling transport method should be processed for other kinds of plants, vegetables and cereal crops to find out appropriate parameters, such as mechanical structure of device, wave length and power of laser, frequency and duty cycle of PWM control signal and exposure time, etc. © 2019 China Agricultural University