Abstract:

In order to study the nutrient controlling release effect of controlled release urea coated with natural wood flour, three kinds of controlled release urea were examined by water-extraction method at room temperature. Pot experiment was conducted to examine the effects of controlled release urea on the leaf chlorophyll content, yield, nutrient absorption, nitrogen utilization rate and quality indexes of Chinese cabbage. The results showed that, coated urea presented good performance with slow release, and the N-release model changed with the amount of coat material. Pot experiment proved that, equal amount coated urea treatment (CRU1) promoted the Chinese cabbage’s growth, yield (fresh weight) and nitrogen utilization of urea increased by 17.7% and 12.4% respectively, compared with the common chemical urea treatment (CCU), and the statistic difference was significant (P<0.05). The reduction amount treatments of 10% and 20% (CRU2 and CRU3) had no significant difference with the common chemical urea treatment (CCU) in cabbage production (fresh weight). There was no significant difference between all the nitrogen treatments in the quality of Chinese cabbage. Coated urea could match with the nutritional needs of Chinese cabbage, and improve nitrogen use efficiency.