Effect of Silicium-Calcium-Potassium Fertilizer and Trace Elements on the Biuret Toxcity in Maize

A pot experiment was carried out to study the effect of silicium-calcium-potassium fertilizer(Si-Ca-K) and trace elements on the biuret toxcity in maize with an aim to providing the theoretical basis for exploring methods to reduce the fertilizer biuret toxcity. The results showed that the compound fertilizer with 2% and 4% biuret had obvious toxic effect on maize. Applying 40% Si-Ca-K and trace elements(0.25% Zn O and 0.5% H3BO3) could reduce the toxcity of the biuret in fertilizers. The alleviation effect of the trace elements to the biuret toxicity was much better than Si-Ca-K. The toxcity would be almost completely eliminated when trace elements were applied on the compound fertilizers with 2% biuret, while the toxic effect of 4% biuret was just alleviated to a certain extent. Si-Ca-K could also alleviate the biuret toxicity when the level of the biuret was below 2% in compound fertilizers. But Si-Ca-K would be useless on the biuret toxicity when the biuret content reached 4%. In conclusion, the compound fertilizers on maize with biuret concentrations should be controlled under 2%,and appropriate trace elements should be applied at the same time to reduce the biuret damage.