淹水条件下氨酸法生产颗粒有机无机复混肥养分缓释特性

采用直接淋洗和淹水培养间歇淋洗两种方法评价氨酸法生产颗粒有机无机复混肥的养分缓释特性。结果表明,对氨酸法生产有机无机复混肥造粒,有直接减缓其有机和无机养分释放的效应。在等氮水平下,不同种类有机无机复混肥累积淋失的氮量明显不同,且与淋失的有机碳量没有明显的相关关系,表明有机与无机养分的配比比例影响肥料的氮释放特性。在本研究中,造粒对氨酸法生产的有机和单一无机氮复混肥中氮养分的缓释效果最差,而对氮钾比为2∶1的两种肥料中有机和无机养分的缓释效果均相对较好。

Slow Release Characteristics of Nutrients under Flooding Soil Incubation in Granule Organic-inorganic Fertilizers Produced by Using Ammonium and Acid Method

The objective of this study was to assess slow release characteristics of nutrients in granule organic-inorganic compound fertilizers by using both of direct leaching methods and intermittent leaching methods.The result showed that release of organic nutrient and inorganic nitrogen in organic-inorganic compound fertilizers produced by ammonium and acid method could be directly decreased through introduction of granulation process,since granulation could reduce the specific surface area of the fertilizers.The amount of nitrogen leaching varied from fertilizer to fertilizer,and there was no significant relationship between organic matter and inorganic nitrogen content in the leaching solutions.Therefore,ratio of organic nutrient to inorganic nutrient affected the nitrogen release characteristics of the fertilizers.In the paper,granulation reduced nitrogen release velocity of organic-inorganic nitrogen fertilizer ineffectively.However,organic matter and inorganic nitrogen of the fertilizer,containing the 2∶1 ratio of nitrogen to potassium,was introduced into the leaching solution at a relatively slower reduced speed.