发酵床养猪垫料的养分转化与植物毒性研究

发酵床养殖技术也被称为原位堆肥技术,是一种值得推荐的控制畜场粪便排放与污染的生态养殖模式。本研究检测了发酵床的水分、温度和pH值变化以及在连续饲养两批猪后垫料中碳、氮和磷的组成与含量变化情况及其对植物毒性的强弱。结果表明,发酵床使用期间水分为58%~61%,垫料内部温度维持在40~55℃;在连续饲养两批猪后,垫料的pH值升高至8.16,氮、磷含量显著提高,铵态氮、亚硝态氮和硝态氮浓度显著升高,C/N比由养猪前的84∶1下降至31∶1,N/P比由2.8∶1下降至1.26∶1;垫料中的总铜浓度由7mg·kg-1升高至89mg·kg-1。以白菜种子作发芽试验考察废弃垫料的植物毒性,其相对发芽率为86.67%,相对根长为132.95%,发芽指数(Germination Index,GI)为115.23%,说明饲养了两批肥猪的发酵床垫料无植物毒性作用,对根的生长有促进作用,可作为有机肥还田。

Nutrition Transformation and Phytotoxicity of Pig Litters Under Pig-on-Litter(POL) System

The pig-on-litter(POL) system, also known as in-situ composting is one of the most highly recommended methods to threat pig wastes. A study was carried out to investigate the changes of water content, temperature and pH of the compost resulting from the POL system. The changes in the forms and content of carbon, nitrogen and phosphorus of the compost were also examined. The phytotoxicity of the extracts after two successive batches of pigs was assessed using the Chinese cabbage seed germination test. The re...