Comparison of Tolerance to High Moisture Conditions of the Soil Among Crop Plants: Studies on the Comparative Plant Nutrition [English Translation]

Tolerance to high moisture conditions in the soil was compared for eighteen crop species, and factors causing differences among species were studied: 1) When the moisture content of a soil was kept high, the soil air contained 10.5 - 17.5% of O2 and 5.0 - 9.8% of CO2, and the soil solution was not very high in Fe, Mn or NO2-N. 2) Cruciferae, Solanaceae, sugar beet, field bean, pea, cucumber and Chrysanthemum coronarium were very susceptible to this condition, but maize, soybean, and onion were tolerant. Rice grew better under this condition than under ordinary upland conditions. 3) Tolerance to a low O2 concentration in water culture conditions was low for Chinese cabbage, tomato, sugar beet, Chrysanthemum coronarium, and eggplant, but was high for rice, onion, Azuki bean, and red pepper. 4) Tolerance to a high CO2 concentration in water culture conditions was low for Cruciferae, tomato, Chinese cabbage, red pepper, cucumber, and pea, but it was high for rice. 5) Tolerance to high moisture in the soil correlated well with the combination of tolerances to low O2 and high CO2 concentrations in water culture conditions. 6) Some of the species tolerant to high moisture in the soil developed more roots in the surface horizon of the soil when the moisture content of a soil was excessively high than when it was normal

Phosphorus Recovery from municipal wastewater sludge by adding phosphatase and citric acid as catalyst

第5回衛生工学シンポジウム（平成9年11月6日（木）-7日（金） 北海道大学学術交流会館） . 1 計画・展望 . P1-1