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通过盆栽试验,氮素设置3个水平,棉秆炭用量占土壤质量分数设置4个不同水平,研究棉秆炭对玉米生长及氮素利用的作用效果。结果表明,不施氮肥(N0)处理,添加棉秆炭抑制玉米器官的生长和生物量积累,生物量降低幅度为4.98%~17.36%;氮肥与棉秆炭配施提高玉米器官的生长和生物量积累,提高幅度为1.68%~11.30%,不同棉秆炭处理间差异不明显。添加棉秆炭促进玉米根系生长,提高根冠比,增加氮素对玉米根冠比的影响不明显;同时,添加棉秆炭抑制玉米根、茎、叶、棒以及植株吸氮量,增加施氮量抑制作用逐步降低。施入棉秆炭降低氮肥吸收效率,提高氮肥表观利用率,相比不添加棉秆炭(BC0)处理,添加2.0%棉秆炭(BC2.0)处理氮肥吸收效率降低2.50%和4.96%,氮肥表观利用率提高8.48%和7.49%,过量的棉秆炭添加可能降低氮肥表观利用率。
Through pot experiment, three levels of nitrogen were set, the amount of cotton stalk carbon accounted for four different levels of soil mass fraction to study the effects of cotton stalk carbon on the growth and nitrogen utilization of maize. The results showed that without N treatment, cotton stalks were added to inhibit the growth and biomass accumulation of corn organs, and the biomass reduction ranged from 4.98% to 17.36%. The combination of nitrogen fertilizers and cotton stalks increased the growth and biomass of maize organs The amount of accumulation increased by 1.68% ~ 11.30%. There was no obvious difference between different treatments of cotton straw. The effect of adding cotton stalk charcoal to corn root growth, root / shoot ratio increasing and nitrogen increase was not obvious. At the same time, adding cotton stalk carbon inhibited corn root, stem, leaf, stem and plant nitrogen uptake Nitrogen suppression gradually reduced. Applying cotton straw charcoal to reduce nitrogen absorption efficiency and increase nitrogen apparent utilization rate, compared with no BC0 treatment, 2.0% cotton BC2 treatment reduced nitrogen absorption efficiency by 2.50% and 4.96% , Apparent nitrogen utilization rate increased by 8.48% and 7.49%, excess cotton stalk carbon addition may reduce the apparent nitrogen utilization rate.