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为了探讨保水缓释肥对作物生长的调控,以“盐稻12号”为材料,研究了不同配比(1%、2%和4%)的盐碱地保水缓释肥(ZL 2012 1 0400570.0)对盐胁迫20、40、80 d水稻幼苗植株形态、根系发育、干重、叶绿素含量、气体交换参数和水分利用效率的影响。结果表明:无论是低盐还是高盐处理下,随着肥料施用配比的增加,植株长势逐渐增强,总根长、根体积、根表面积、根尖数、植株干重均显著上升,尤其在4%肥料施用下这些促进效果尤为明显;随着肥料施用配比的增加,叶片叶绿素含量、气体交换各参数、水分利用效率等均逐渐上升,而气孔限制值显著下降。综上所述,该盐碱地保水缓释肥明显增强水稻幼苗的耐盐性,主要与其能促进盐胁迫下根系生长,提高叶绿素含量,改善气孔限制,促进植株的光合作用并提高水分利用效率有关。
In order to investigate the regulation of water-preserved slow-release fertilizer on crop growth, salt-alkali water-preserved and slow-release fertilizer of different proportions (1%, 2% and 4% ) On plant morphology, root development, dry weight, chlorophyll content, gas exchange parameters and water use efficiency of rice seedlings under salt stress at 20,40,80 d. The results showed that under either salt or salt treatments, the plant growth gradually increased with the increase of fertilizer application rate. The total root length, root volume, root surface area, root tip number and plant dry weight increased significantly, especially at Under the 4% fertilizer application, the promotion effect was especially obvious. With the increase of fertilizer application ratio, the leaf chlorophyll content, gas exchange parameters and water use efficiency increased gradually, while the stomatal limitation decreased significantly. In summary, the saline-alkali water-saving slow-release fertilizer significantly enhanced the salt tolerance of rice seedlings, mainly related to its ability to promote root growth under salt stress, increase chlorophyll content, improve stomatal limitation, promote plant photosynthesis and improve water use efficiency.