摘要
研究了浙江省缙云县开采的两种沸石矿样,1号样含65％的丝光沸石,阳离子交换量(CEC)达142.5meq/100 g;2号样含40％的丝光沸石和斜发沸石,CEC为80.0meq/100g。这些沸石富有效钾,含近500ppm的水溶性硅,饱和持水量大于100％,具有较大的水分、养分保蓄能力,酸度缓冲容量也较大。它们能显著地增大吸附和保持NH_4+和NH_3的容量,但其在交换点上的饱和度与土壤无显著差别。直接拌混沸石于肥料或土壤中,仍不能有效地防止挥发和淋失。因此,将沸石应用作土壤水分、养分调节剂仍需解决技术工艺。施沸石于CEC小的轻质土壤效果较好。
Some important agro-chemical properties of two types of zeolite deposits under mining in Jinyun County, Zhejiang Province, were examined to assess the feasibility of applying them as a soil moisture and nutrient conditioner. The sample of the first type contained 65% mordenite with a CEC of 142. 5 meq/100 g;that of the second type,40% mixed mordenite and clinoptilolite with a CEC of 80. 0 meq/ 100 g. Both of them were abundant in labile K and water soluble Si (Table 1). The water capacity and acid buffering capacity were several times larger than those of a clayey soil near Nanjing (Figs. 1,2). While the zeolites kept much more ammonium in the liquid phase,no difference was observed in the ammonium saturation rate at exchangeable sites between zeolite and soil (Fig. 3). The dynamics of N desorption of zeolite was similar to that of soil (Figs. 2,3). The N in fertilizers simply mixed with zeolite was easily lost upon volatilization and leaching (Tables 2,3). However, zeolite could absorb ammonia gas and ammonium at low concentration. It is suggested that the zeolites could be used in agriculture when the technology of manufacture has been developed.
出处
《江苏农业学报》
CSCD
1991年第4期31-36,共6页
Jiangsu Journal of Agricultural Sciences
关键词
沸石
农业化学
土壤调节剂
Natural zeolite
Agro-chemistry
Fertilizer nitrogen use
Soil conditioner
