Study on Inactivation of Barnyard-grass Seed by DSC
[Objective] The heating rate and the highest temperature on inactivation of Bamyard-grass seed were studied in order to decrease energy consumption of thermal weed control equipment and improve the work efficiency.[ Method] The effect of heating rate and the highest temperature on inactivation of Bamyard-grass seed was studied by differential scanning calorimetry (DSC). Germination experiment of Bamyard-grass seed heat treated was carried out. [Result] Heating rate was the main factor resulted in glass transition of Bamyard-grass seed. Glass transition was not distinct at 5 K/min heating rate. At 20 K/min heating rate, glass transition was obvious and glass transition temperature (Tg) was 75.9℃. However, when heating rate reached to 25 K/min, glass transition lagged and Tg was delayed to 80.2℃. And the glass transition plays an important role in viability loss of Bamyard-grass seed. At 5 K/min heating rate and 91 ℃. highest temperature, germination of Bamyard-grass seed was still 57%. But when heating rate increased to 20 K/min, all of the seed lost viability at the same highest temperature. [Conclusion] The factors of weed seeds inactivation heating rate and the highest temperature have important reference value for designing thermal weeding equipment and settings operating parameters in the field.
国家科技期刊平台
NSTL
万方数据
维普
