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Pot experiments were carried out to study characteristics of soil selenium (Se) enrichment and its influence on Chinese medicinal plant Abelmoschus manihot, and selenium contents in aboveground parts of A. manihot under conditions of natural Se-rich, low soils and exogenous Se addition were analyzed. Results indicated that contents of total Se and various Se fractions of natural Se-rich soil were significantly higher than that of Se-low soil (P < 0.05), and Se content in aboveground parts of A. manihot grown in natural Serich soil was significantly higher than that in natural Se-low soil (P < 0.05). The Se content in aboveground parts of A. manihot increased with the increase of soil total Se content, soil pH and contents of various Se fractions, showing significant tolerance to high Se. Moreover, it was initially found that A. manihot could effectively absorb soil Se even in relatively low Se soil conditions (soil Se content of 0.11~0.12 mg/kg) and thus reaching the standard of Se-rich crops. Bangladesh J. Bot. 51(4): 961-970, 2022 (December) Special

Soil selenium content affects the absorption and accumulation of selenium in crops and ultimately affects human health; therefore, it is of great significance to study the characteristics of selenium content in soils and crops. Based on the previous agricultural geological survey and research carried out in Lintong area, and combined with data of Second National Land Survey, the agricultural geological survey and evaluation at the village level was carried out in Zhangba Village, Lintong District. Distribution characteristics of soil selenium content in each plot and selenium levels in crops were analyzed systemically, and the causes and influence factors of soil selenium was preliminarily studied. This survey found that selenium content of the soils and crops in Zhangba Village all met the standard of selenium enrichment. This finding provides strong support for land resource planning and management and rational utilization of selenium-rich soil resources in this area, moreover, it is of great significance to adjust planting structure, improve land use value, and promote development of selenium-rich agriculture.

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120 respondents which from selenium-rich and selenium-poor areas respectively were investigated and analyzed by means of questionnaire survey and statistical analysis to study the relationship between soil selenium level and human health in GuanZhong area, shaanxi province. Studies have shown that the incidence of diabetes (X 2 = 4.25, P < 0.05), coronary heart disease (X 2 = 4.63, P < 0.05) and gastritis (X 2 = 6.67, P < 0.01) in selenium-poor areas in GuanZhong area, shaanxi province is significantly higher than that in selenium-rich areas. It is urgent to adjust the dietary habits in the selenium-poor areas, and pay attention to proper intake of selenium-rich food in daily diet, so as to prevent and treat the related diseases caused by selenium deficiency.