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[Objective] In order to explore the effects of low nitrogen stress on the growth and soil nutrients of tartary buckwheat in the hilly and gully regions of the Loess Plateau, the present paper determined plants and soil characteristics of tartary buckwheat with different nitrogen stress among the whole growth period It could provide a scientific basis for the optimal management of farmland nitrogen fertilizer in the loess hilly and gully region. [Method] The study took different nitrogen buckwheat (Heifeng No. 1, HF, intolerant to low nitrogen, Diqing Tartary Buckwheat, D Q, tolerant to low nitrogen) as the research objects, and set 3 levels of nitrogen application as follows : 0 kg/hm² (NO, no nitrogen treatment), 80 kg/hm² (Nl, low-nitrogen treatment), 160 kg/hm² (N², normal nitrogen treatment). Plant indexes (plant height, stem thickness, leaf area) and soil characteristics (soil water content, pH, organic matter, alkali-hydrolyzed nitrogen, available phosphorus, available potassium, total nitrogen, total phosphorus, total potassium) were determined during the whole growth periods. [Result] (i) Cultivar, nitrogen treatment and the interaction between the two had extremely significant effects on tartary buckwheat plants (P < 0. 01). Under Nl treatment, the plant height, stem thickness and leaf area of DQ in the seedling stage were 9. 7 %, 10. 5 %, and 17. 7 % higher than that of HF. The plant height and stem thickness of DQ in the flowering stage were 9. 5 % and 7. 4 % higher than that of HF. The stem thickness and leaf area of DQ were 5. 4 % and 3 6. 2 % higher than those of HF. (ii) The cultivars, nitrogen treatments and the interaction between the two had a significant impact on soil nutrients (P < 0. 01). After the growth period, the soil nutrient indexes of the two cultivars were lower than those of the sowing period, but soil organic matter, available nitrogen, available phosphorus, available potassium, total nitrogen, and total potassium of DQ were higher than those of HF under Nl treatment of98. 8%, 11. 6%, 44. 7%, 11. 6%, 80. 41%, 4. 2%, respectively. [Conclusion] The DQ (low nitrogen tolerant) has better water conservation and green manure benefits than HF (intolerant to low nitrogen) as its larger leaf area and stem thickness could buffer the direct erosion of rainfall on the ground and resist wind to prevent plant lodging. In addition, the rhizosphere soil nutrient content of DQ was higher than HF after being harvested which could reduce the fertilizer consumption in the next season and was also more conducive to the sustainable development of agriculture. [ABSTRACT FROM AUTHOR]

[Objective] Optimizing the fertilization technology of Panax notoginseng, protecting the ecological environment of Panax notoginseng production area, and providing theoretical and practical basis for promoting the development of Panax notoginseng industry. [Method] Through the field experiment of fertilizer reduction, the effect of different treatments on the nutrient changes of the planting soil was compared and analyzed. The effects of agronomic characteristics, yield, nutrient absorption and saponins content of Panax notoginseng. [Result] The soil fertility of the 3-year-old Panax notoginseng planting area was at a rich level, and reduced fertilization did not result in a decrease in the yield and quality of Panax notoginseng. The treatment of Cl agronomic characteristics was significantly better The content of saponin in treatment of CR and treatment of CK. Treatment of Cl and treatment C2 was significantly higher than that of treatment of CR and treatment of CK. Comprehensive comparison, treatment of Cl is more suitable for the growth and development of 3-year-old Panax notoginseng. [Conclusion] Excessive or insufficient fertilization will affect the three For the growth of seven, pay attention to the control of the amount of fertilizer in the process of topdressing, and apply the appropriate amount of fertilizer. [ABSTRACT FROM AUTHOR]