This study was to understand the physiological changes of four kinds of crop seeds including baby corn, cowpea, radish and rape- seed, under the treatment of ultra-drying. Large amounts of seeds as experimental materi...This study was to understand the physiological changes of four kinds of crop seeds including baby corn, cowpea, radish and rape- seed, under the treatment of ultra-drying. Large amounts of seeds as experimental materials （ 10 kg for each material） were respectively dried to the suitable water content consistent with the ultra-dried seed criterion via heating at 50 ~C; then the physiological indices of these ultra-dried seeds such as water content, seed germination, dehydrogenase activity and SOD activity were measured. The results showed that except cowpea seeds, whose ultra-drying treatment should be controlled between two and four days, other three kinds of seeds were tolerant to high tem- perature and low water content. The ultra-dried seeds assumed similar or even higher activities than CKs, but showed no damage symptom. Our result proves that ultra-drying treatment via heating at 50 ℃ is safe and efficient to experimental seeds.展开更多
150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples f...150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples from twelve locations （40%）, in 2010, in samples from four locations （13.3%） and in 2011, in samples from three locations （10%）. Altogether 15 different residues in pollen were found in 2009, two in year 2010 and five in 2011. Residues found in the pollen samples ranged from 0.001 mg/kg to 76 mg/kg. The highest number （twelve） of residues was found in pollen from the intensive fruit farming locations and from the intensive viticulture locations （eight）. The residues were mostly from the fungicide group （69%）. Insecticide residues （chlorpyrifos-ethyl, methoxyfenozide, thiacloprid） were found in the pollen samples from eight locations. Residues in the pollen did not statistically influence the development of the honeybee colonies or infestation rate of Nosema （Nosema spp.）, or viruses ABPV （acute bee paralysis virus）, SBV （sacbrood virus）, DWV （deformed wing virus）, and BQCV （black queen cell virus））.展开更多
文摘This study was to understand the physiological changes of four kinds of crop seeds including baby corn, cowpea, radish and rape- seed, under the treatment of ultra-drying. Large amounts of seeds as experimental materials （ 10 kg for each material） were respectively dried to the suitable water content consistent with the ultra-dried seed criterion via heating at 50 ~C; then the physiological indices of these ultra-dried seeds such as water content, seed germination, dehydrogenase activity and SOD activity were measured. The results showed that except cowpea seeds, whose ultra-drying treatment should be controlled between two and four days, other three kinds of seeds were tolerant to high tem- perature and low water content. The ultra-dried seeds assumed similar or even higher activities than CKs, but showed no damage symptom. Our result proves that ultra-drying treatment via heating at 50 ℃ is safe and efficient to experimental seeds.
文摘150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples from twelve locations （40%）, in 2010, in samples from four locations （13.3%） and in 2011, in samples from three locations （10%）. Altogether 15 different residues in pollen were found in 2009, two in year 2010 and five in 2011. Residues found in the pollen samples ranged from 0.001 mg/kg to 76 mg/kg. The highest number （twelve） of residues was found in pollen from the intensive fruit farming locations and from the intensive viticulture locations （eight）. The residues were mostly from the fungicide group （69%）. Insecticide residues （chlorpyrifos-ethyl, methoxyfenozide, thiacloprid） were found in the pollen samples from eight locations. Residues in the pollen did not statistically influence the development of the honeybee colonies or infestation rate of Nosema （Nosema spp.）, or viruses ABPV （acute bee paralysis virus）, SBV （sacbrood virus）, DWV （deformed wing virus）, and BQCV （black queen cell virus））.
