Effect Of LCO And Th17on The Morphological And Physiological Indexes And Yields Of Soybean And Maize

This experiment used growth regulator LCO and TH17for seed soaking combined with different supplement water and spraying them on the leaf in key growth periods of soybean and maize in rainfall field of loess plateau hilly-gully region of Inner Mongolia. The purpose of this trail is to explore the effects of LCO and TH17on the morphological and physiological indexes and yields of soybean and maize.The results shows:1. LCO and TH17seed soaking treatments can remarkably improved the germination rate of soybean and maize and achieve stable germination rate earlier. Eventual emergence rate of TH17and LCO seed soaking combining with certain water supplement treatments increased by0.90%to14.71%and earlier0to3days than control for soybean. The effect of TH17with0.1L water every hole treatment is the best, and TH17with0.2L water every hole treatment occupied second. Eventual seed germination rate maize in TH17and LCO seed soaking treatments improved1.76to4.30percent and earlier0to3days than control. The effect of TH17with0.1L water every hole treatment is the best, and LCO with0.2L/hole water treatment occupied second.2. LCO and TH17seed soaking have different degrees impacts of seedling stage morphology, photosynthesis and physiological and biochemical indicators of soybean and maize. LCO and TH17seed soaking combining wih supplement water or in different water stress increased plant dry weight6.25%to62.63%, root activity1.31%to80.51%, free proline content0.88%to56.08%, SOD activity1.32%to99.84%and the photosynthetic rate0.32%to44.43%than control, and reduced malondialdehyde content1.45%to19.10%than control.So LCO and TH17can effectively improve the ability of soybean and maize resist drought at seedling stage.3. In the flowering and podding stage and the drum grain of soybean and the big bell stage and the filling stage of maize, spraying LCO and TH17can remarkably improve photosynthetic rate,leaf chlorophyll content and instantaneous water use efficiency and plant dry matter quality. The photosynthetic rate, dry matter,SPAD value in the second and fifth day(soybean) and the thirth and seventh day(maize) were higher0.32%to74.13%,0.20%to21.12%and1.04%to47.20%.than spraying water and none spraying in two critical periods of soybean and maize within a week after spraying TH17and LCO.4. Seed soaking treatments combined with supplement water seeding and spraying in two critical periods with LCO and TH17both can remarkably improve the yield of maize and soybean. The grain yield and biological yield of LCO and TH17seed soaking treatments increased by2.10%to69.93%and0.92%to19.02%respectively. The grain yield and biological yield of spraying LCO and TH17in blossom podding stage and drum stage of soybean treatments were higher4.82%to51.09%and9.42%to26.54%respectively than spraying water and no spraying, and effects of10"9mol/L LCO and10-7mol/L TH17were better.The immature grain rates of treatments were lower0.82to43.69percent than spraying water and no spraying, and10’9mol/L was better than10-7mol/L. The grain yield and biological yield of spraying LCO and TH17in big bell stage and filling stage of maize were higher0.69%to8.57%and3.87%to34.43%than spraying equal parts water and no spraying. The immature grain rates respectively lowed14.81to70.39percent, and LCO was better than TH17,10-9mol/L was better than10"7mol/L.