Clinoptilolite is a zeolite mineral with high cation exchange capacity used in zeoponic substrates that have been proposed as a solid medium for growing plants or as a fertilizer material. The kinetics of nitrification has not been measured for NH4+ saturated zeoponic substrate. Experiments were conducted to evaluate the production of NO2- and NO3-, and nitrifier populations in zeoponic substrates. Small columns were filled with zeoponic substrate inoculated with a commercial inoculum or soil enrichment culture of nitrifying bacteria. In addition to column studies, a growth chamber study was conducted to evaluate the kinetics of nitrification in zeoponic substrates used to grow radishes (Raphanus sativus L.). The zeoponic substrate provided a readily available source of NH4+, and nitrifying bacteria were active in the substrate. Ammonium oxidation rates in column studies ranged from 5 to 10 micrograms N g-1 substrate h-1, and NO2- oxidation rates were 2 to 9.5 micrograms N g-1 substrate h-1. Rates determined from the growth chamber study were approximately 1.2 micrograms N g-1 substrate h-1. Quantities of NH4+ oxidized to NO2- and NO3- in inoculated zeoponic substrate were in excess of plant up-take. Acidification as a result of NH4+ oxidation resulted in a pH decline, and the zeoponic substrate showed limited buffering capacity.

中文翻译：

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共沸基质中的硝化作用。

斜发沸石是具有高阳离子交换能力的沸石矿物，用于沸石基质中，已被提议作为植物生长的固体介质或肥料。尚未测量NH4 +饱和沸石基质的硝化动力学。进行了实验以评估共沸基质中NO2-和NO3-的产生以及硝化剂的数量。在小柱子上装满接种商业化接种物或硝化细菌的土壤富集培养物的共沸基质。除了进行柱研究外，还进行了一个生长室研究，以评估用于种植萝卜（Raphanus sativus L.）的共沸基质中硝化的动力学。该共沸基质提供了容易获得的NH 4+来源，并且硝化细菌在该基质中具有活性。柱研究中的铵氧化速率为5至10微克N g-1底物h-1，NO2-氧化速率为2至9.5微克N g-1底物h-1。根据生长室研究确定的速率约为1.2微克N g-1底物h-1。接种的共沸基质中氧化成NO2-和NO3-的NH4 +的数量超过了植物的吸收量。NH4 +氧化导致的酸化作用导致pH值下降，并且共沸物底物的缓冲能力有限。接种的共沸基质中氧化成NO2-和NO3-的NH4 +的数量超过了植物的吸收量。NH4 +氧化导致的酸化作用导致pH值下降，并且共沸物底物的缓冲能力有限。接种的共沸基质中氧化成NO2-和NO3-的NH4 +的数量超过了植物的吸收量。NH4 +氧化导致的酸化作用导致pH值下降，并且共沸物底物的缓冲能力有限。