Abstract:

To improve the utilization of fertilizers effectively, spring highland barley ‘Zangqing 2000’ was chosen as the test material and the sheep manure was used as the organic fertilizer in this study to replace part of the nitrogen and phosphorus fertilizers. The long-term position monitoring was carried out to explore the response of crop dry matter accumulation, nitrogen, phosphorus and potassium nutrient distribution and absorption under different fertilization modes. The results showed that the absorption of nitrogen and potassium by crops during the entire growth period was much greater than that of phosphorus, and their nitrogen content could reach the highest during the seedling stage, which was the critical period for nitrogen accumulation. The phosphorus and potassium content peaked at the tillering stage, which was a critical period for the accumulation of phosphorus and potassium nutrients. Under different fertilization modes, the organic emission reduction mode (T₃) and the comprehensive emission reduction mode (T₄) had more obvious effect. And the T₃ mode (organic fertilizer replacing 25% urea + 58.3% diamonium phosphate) was the optimal treatment, which could achieve higher dry matter accumulation and improve the absorption of nitrogen, phosphorus, and potassium nutrients in grains, straws and roots significantly.

Key words: fertilizer use efficiency, fertilization mode, highland barley, dry matter accumulation, nutrient absorption, sheep manure organic fertilizer, nitrogen fertilizer, phosphorus fertilizer