土壌内蛔虫卵の分布と発育に関する研究

第2報 日照時間の長短が土壌内蛔虫卵に及ぼす影響について

抄録

The findings which were odserved how comparative length of the sunshining-hour influenced to the eggs of ascaris lumbricoides in the soil, considering a temperature, rain-fall and depth, and were observed the cultivation in the incubator to examine how temperature and dry influenced to the eggs in the soil, are following.
1. When it was droughty in summer, the eggs in the soil began to grow up just same speed without the relation of the length sunshining hour. And then most of them except the ones in shade died out within 1 month. Compared the speed to die out, the difference of long and short of the sunshining hour was hardly related. The longer the sunshining hour was, the more quickly they did not always die out, but the eggs in the quite shade died slowly.
2. When it was more cloudy or raing from midsummer to early autumn, the eggs in the soil grew very much comparatively, the longer the sunshining hour was, the more quickly they grew. But big difference was not showed.
3. Following the observation about long or short of the sunshining hour when the depth ofthe soil was divided to the upper layer (0-0.5cm) and the underlayer (0.5 3cm), on the speed to die or to grow, the eggs in the upper layer died or grew a little than the eggs in the underlayer.
4. Without the relation of the sunshining, following the findings the eggs in the soil were grown in the incubator, the days by all of them formed are under 30°C, 17 days this was the shortest out of 20°C, 25°C, 30°C -in the damp soil. 30°C was - the most suitable to grow up. 35°C, 40°C troubled to grow and let them die out. Compared them, in the dry soil the days by all of them died out are under 40°C within 3 days, 35°C within 5 days, 30°C within 6 days, 25°C within 10 days, 20°C within 13 days.