Effects of Combined Application of Controlled Release Urea and Common Urea on Activities of Key Enzymes Related with Nitrogen Metabolism, Yield and Quality of Rice
DU Jun
SUN Kegang
LEI Lijun
HE Ailing
ZHANG Yunhong
SUN Kezhen
Abstract：In oder to verify the mechanism of controlled release urea( CRU) on increasing nitrogen use ef-ficiency, yield and improving rice quality, field experiments were conducted to study the effects of com-bined application of CRU and common urea( CU) on activities of key enzymes related with nitrogen me-tabolism and nitrogen use efficiency as well as yield and quality of rice with four treatments( treatment 1 without nitrogen fertilizer( CK) , treatment 2 with 100%CU,treatment 3 with 40%CRU+60%CU,treat-ment 4 with 60%CRU+40%CU,treatment 5 with 100%CRU) . The results showed that compared with 100%CU, the application of CRU could significantly improve nitrate reductase ( NR) activities of rice leaves at full heading stage and milk stage, especially at milk stage;as a whole, CRU could significantly improve glutamine synthetase activities of rice leaves at full heading stage and milk stage, and glutamine transfersase activities from full heading stage to dough stage, especially at full heading stage;CRU could significantly increase protease activities of rice leaves at milk stage and dough stage; as a whole, CRU could improve the activities of glutamine synthetase and glutamine transfersase of rice grain from full heading stage to dough stage;CRU could significantly increase rice yield and nitrogen use efficiency by 16. 0%—21. 4% and 30. 7%—48. 5% respectively, and significantly enhanced protein contents in rice grain. The treatment 4 was the best in the enhancement effects of the above indicators.
Keywords：controlled release urea fertilizerricenitrogen metabolismkey enzymes activitiesyield and quality
Publication Date：2016-03-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 67-72 )