氮素和生物腐解剂调控下稻草还田对水稻氮素积累及产量的影响

采用田间试验,研究在不同的氮素和生物腐解剂调控措施下稻草还田对水稻氮素积累及其产量的影响。结果表明,秸秆还田能显著提高水稻穗的氮素积累量。与对照相比,无论是总的氮素积累量,还是籽粒的氮素积累量,均以稻草还田两年+高氮+生物腐解剂的处理为最大值。不同处理水平对水稻产量也有明显影响:稻草还田两年的处理显著高于一年的处理,高氮水平显著高于低氮水平,添加生物腐解剂的处理优于未添加生物腐解剂处理;其中以稻草还田两年+高氮+生物腐解剂处理的水稻产量最高。因此,我们认为稻草还田两年+高氮+生物腐解剂是东北地区的最佳稻草还田方式。

Effects of Rice-Straw Return to Field on Nitrogen Accumulation and Yield of Rice under the Nitrogen Manipulation and Biological Decomposing

A field experiment was carried out to study how nitrogen accumulation and yield of rice straw were affected by the measure of rice straw return to field under the application of nitrogen and biological decomposing agents.The results showed that rice straw could improve nitrogen accumulation of rice ear obviously.Compared with CK,both the total nitrogen accumulation and grain nitrogen accumulation were higher in the treatment of 2-year rice straw return.Different treatment levels also obviously impacted the rice yield: 2-year of straw return was significantly higher than 1-year of straw return,high-N treatment was significantly higher than the low one,and treatments with biological decomposing agents were better than those without.Of all the above treatments,the rice yield was highest in the treatment of 2-year straw return + high nitrogen + biological decomposing agents.Therefore,we concluded that this treatment was the best measure for rice straw return to field in northeastern China.