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目前,一般认为土壤中水解性氮与田间作物生长的相关性较密切,测定土壤水解性氮就基本能反映土壤氮素的供应状况。土壤水解性氨的测定,过去一直沿用硫酸浸提的丘林法;以后改用碱解蒸馏和扩散吸收法。但这些方法都不适宜田间现场测定,因而不能及时指导施肥。气敏氨电极研制成功后,也开始应用于土壤肥料中各种形态的氮素测定。我们应用气敏氨电极法对红壤性水稻土中的水解性氮的测定进行了初步的
At present, it is generally believed that the correlation between hydrolysable nitrogen in the soil and crop growth in the field is relatively close. Determination of soil hydrolyzable nitrogen basically reflects the supply status of soil nitrogen. Determination of soil hydrolyzable ammonia, the past has been used in sulfuric acid leaching of the method of Qiu Lin; after the conversion to alkali distillation and diffusion absorption method. However, these methods are not suitable for field measurements, which can not be timely guidance fertilization. After the successful development of gas-sensing ammonia electrode, it has also begun to be applied to various forms of soil nitrogen fertilizer determination. We applied the gas-sensing ammonia electrode method to determine the hydrolyzable nitrogen in red paddy soil