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以郑单958为材料,设置不同氮素梯度于苗期利用完全营养液培养,3叶期叶面喷施聚糠萘合剂,研究供氮量对苗期玉米氮素吸收分配特征的影响以及聚糠萘合剂化学调控的效果。结果表明,与去离子水处理相比,增加氮素供应可使株高增加,根系增长,根冠比值显著降低,叶片与根中硝酸还原酶活性(NRA)增大,鞘中NRA减小。随氮素浓度的增加,株高、最大根长和叶片数逐渐增加,各器官干物质积累量依次增加,叶片中NRA依次增强,氮素吸收和向地上部分配的比例显著增加。聚糠萘合剂处理与相应清水对照相比,提高了植株干物质积累,缩短了最大根长,增加了侧根条数,提高了玉米植株中总吸氮量及氮素利用率。对于不同浓度梯度的氮素处理,低浓度(2.5mmol/L)和中浓度(5.0 mmol/L)培养液中调节剂处理氮素利用率分别比对照增加52.75%和54.91%,表明中、低氮条件下聚糠萘合剂提高了氮素利用率。
Zhengdan 958 was used as material to set up different nitrogen gradients to cultivate at the seedling stage with complete nutrient solution. The poly-furfural mixture was sprayed on the leaf surface at the third leaf stage to study the effect of nitrogen supply on nitrogen absorption and distribution in seedling stage and poly Effect of bran naphthalene mixture on chemical regulation. The results showed that compared with deionized water treatment, increasing N supply could increase plant height, root system growth, root / shoot ratio decreased significantly, nitrate reductase activity (NRA) in the leaves and roots increased, and NRA in the sheath decreased. With the increase of nitrogen concentration, the plant height, the maximum root length and the number of leaves increased gradually, the dry matter accumulation of all organs increased successively, the NRA in leaves increased in turn, and the ratio of nitrogen uptake and shoot allocation increased significantly. Compared with the corresponding water control, polycrystalline bran naphthalene mixture increased dry matter accumulation, shortened the maximum root length, increased the number of lateral root tubers, and increased the total nitrogen uptake and the nitrogen utilization rate in maize plants. For nitrogen treatments with different concentration gradients, the nitrogen use efficiency of the regulator in the medium with low concentration (2.5 mmol / L) and medium concentration (5.0 mmol / L) increased by 52.75% and 54.91% respectively compared with the control, indicating that medium and low Nitrogen polycrystalline naphthalene mixture increased nitrogen utilization.