Abstract: In order to explore the effect of biochar combined with nitrogen fertilizer on millet growth and soil, this research studied the effects of biochar(C0, 0 g·kg^-1, C1, 20 g·kg^-1, C2, 40 g·kg^-1) combined with nitrogen fertilizer (N0, 0 g·kg^-1, N1, 0.133 g·kg^-1, N2, 0.266 g·kg^-1) on soil nutrients, root millet morphology, photosynthesis, dry matter accumulation, etc., using Jingu 21 as a test material, a pot experiment to completely randomized design. The results showed that both biochar and nitrogen fertilizer significantly increased the soil nutrient content, and C2N2 processing has the largest increase. Compared with C0N0, the alkali hydrolyzed N content increased by 61.03%. Biochar has a significant promotion on Millet photosynthesis, root morphology, and dry matter accumulation. Under the same biochar level, the low nitrogen fertilizer will promote millet photosynthesis, root morphology, and dry matter accumulation, while the high nitrogen fertilizer will inhibit them. Compared with C0N0, C2N1 has the best effect in which the above-ground dry weight increases the most, with an increase by 129.24%. it summary, it can be seen that biochar and an appropriate amount of nitrogen fertilizer can improve soil nutrient status and promote dry matter accumulation in the above ground. Under the conditions in this experiment, C2N1 is the optimum combination, so the combination of biochar and appropriate amount of nitrogen fertilizer can promote millet growth, which can provide a certain theoretical basis for the yield increase of millet while reducing fertilizer usage.

Key words: biochar, nitrogen fertilizer, millet, root morphology, photosynthesis

摘要： 为探寻生物质炭与氮肥配施对谷子生长及土壤的影响,本研究以晋谷21为试材,采用盆栽试验,完全随机设计,研究了生物质炭(C0,0 g·kg^-1;C1,20 g·kg^-1;C2,40 g·kg^-1)与氮肥(N0,0 g·kg^-1;N1,0.133 g·kg^-1;N2,0.266 g·kg^-1)配施对土壤养分、谷子根系形态、光合作用、干物质积累等的影响。结果表明,生物质炭与氮肥均明显提高了土壤养分含量,其中C2N2增幅最大,碱解氮含量较C0N0提升了61.03%。生物质炭对谷子光合作用、根系形态、干物质积累有明显的促进作用,同一生物质炭水平下,谷子光合作用、根系形态、干物质积累对氮肥的响应均表现为低促高抑;与C0N0相比,C2N1效果最佳,其地上部干重增幅最大,为129.24%。综上,生物质炭与适量氮肥配施可改良土壤养分状况,促进干物质在地上部积累。本试验条件下,C2N1效果最佳。该结果可为谷子减肥增效提供一定的理论基础。

关键词: 生物质炭, 氮肥, 谷子, 根系形态, 光合作用