生物炭与氮肥减量调控对土壤养分和肥力的影响.

[Objective] Under the control measures of biochar and nitrogen reduction, the physical and chemical properties of soil were studied in order to clarify the effect of biochar and nitrogen reduction on the physical and chemical properties of soil. [ Method] Split plot experiments were designed, and with nitrogen fertilizer was the main area; The different magnitude with biological carbon and nitrogen were set up, the breed as the varieties of nitrogen efficiency and inefficiency, Zheng 958 respectively (lh-zd) and jade 508 (XY) first, was deputy district, the soil organic matter content, total nitrogen, available phosphorus and available potassium, conductivity, cation exchange capacity and other indicators were determined. [Result] Under the control measures of biochar combined with nitrogen reduction, the soil total nitrogen, available phosphorus, available potassium, electrical conductivity and soil quality index could be significantly improved, but their effect had no significance on cation exchange. C1 and C3 treatments were beneficial to the accumulation of total nitrogen in the soil, and the total nitrogen content in the rhizosphere soil of high-efficiency nitrogen varieties was more abundant The total nitrogen content of ClZD958 and C3ZD958 were significantly higher than that of the low-efficiency nitrogen varieties of the corresponding treatments (4. 90% and 8. 15% respectively). The content of available phosphorus in ZD958 treated by C2 was significantly higher than that of NHlOl with low nitrogen efficiency, which was 125. 30%, and the content of available phosphorus in ZD958 treated by Cl was significantly higher than that of NH101 with low nitrogen efficiency, which was 25. 23%. The effect of C2 treatment on the accumulation of available potassium in soil was more significant, and the content of available potassium in ZD958 treated by C2 treatment was significantly higher than that of NH101 with low nitrogen efficiency. After biochar application, the electrical conductivity of each treatment was significantly increased, and that of C2 treatment was the most significant Moreover, the rhizosphere soil conductivity of nitrogen efficient cultivars had some advantages over that of nitrogen inefficient cultivars. The electrical conductivity of rhizosphere soil treated with C2ZD958, and ClZD958 were higher than that of ClZD958 6. 87%. The regulation of biochar and nitrogen fertilizer reduction had no significant effect on increasing the cation exchange capacity of soil. [Conclusion] Biochar and nitrogen fertilizer reduction control measures can effectively improve soil quality. The soil quality index of C2 and Cl was the highest, with 0. 746 and 0. 643, respectively. The short-term regulation measures of biochar and nitrogen fertilizer reduction were adopted, which still had a significant effect on soil quality improvement. The combination of biochar 3000 with pure N 300 and 255 kg/hm2 had the most significant effect. [ABSTRACT FROM AUTHOR]