低硒土壤增施高硒石煤的实验研究

湖北省鄂西自治州恩施市为我国第一个高硒区,硒源于石煤.州内还有低硒环境并曾有克山病流行,将硒均值为100mg/kg的石煤颗粒施入低硒土壤后,作物硒及人畜内环境硒水平有明显的剂量效应关系.根据足硒区粮食、饲草及人发硒的推荐值,每公顷施石煤15×10~3-18×10~3kg为宜.此外,讨论了这一措施得以增产的可能因素和该措施可能维持有效作用的年限.

Pilot Field Study on the Application of Seexcessive Bone Coal to Sedeficient Soil

Enshi city situated in the Exi Autonomous Pre- feature, Hubei, is the first Se-excessive area in China due to the local selenium-rich bone Coal origin. However, within the same prefecture, there are also some areas where the Se- deficient environment exists and an epidemic Keshan disease occurred. By applying the grannular bone coal with a mean selenium content of 100 mg/kg to those Se-deficient soils, the levels of selenium either in crops or in human body and animal show a significant dose-effect relation, resulting in not only the selenium supplement for human and animal but also an increase in crop output. Based on the recommended values for selenium in crops and hair of human in those areas where soils have a normal level of Selenium, it is suggested that it would be better to apply 15000-18000 kg/hm2 of bone coal to the Se-deficient soils in crops field. Moreover, the possible factors that make this measure available to increase crops output, and the duration during which this measure can keep the applied selenium available to crops, are also discussed.