Effects Of Foliar Spraying Plant Growth Regulators At Seedling Stage On Cotton Growth And Development,Yield And Quality

The use of DPC plays an extremely important role in Xinjiang cotton "dwarf and early film" cultivation mode and cultivation technology system,but the use of drip irrigation technology under the film affects the growth of cotton root system to a certain extent,leading to production Large areas of late maturity,premature senescence,large and small seedlings have appeared on the market.In this study,different plant growth regulators and their application methods are used to study the regulation technology of different plant growth regulators,including the selection of suitable plant growth regulator formulations,compound formulas,regulation time and optimal concentration,aiming to increase cotton Adversity resistance,promote cotton absorption of water and fertilizer,promote cotton flower bud differentiation,coordinate the dynamic balance of cotton vegetative growth and reproductive growth,promote seedling strength,seedling fullness,seedling uniformity,seedling uniformity,concentrated flowering,concentrated spitting,and increase yield.The sustainable development of Xinjiang cotton provides technical support.The test is carried out in two phases.In 2019,an indoor test was carried out at the Horticulture Experimental Station of Tarim University,and in 2021,it was carried out in the Populus euphratica forest(81°29′E,40°55′N)test field in the east area of Tarim University.Field test.The effects of foliar spraying of different plant growth regulators on cotton root length,root surface area,plant height,stem thickness,biomass accumulation and distribution,yield and quality,and changes in protective enzymes were studied.The main findings are as follows:1.The effects of different plant growth regulators on agronomic traits of cottonFoliar spraying of benzalkonium + sodium nitrophenolate at a medium concentration,and benzine + sodium naphthalene acetate at a medium and high concentration have the best effect on the promotion of cotton plant height;30 days after the application of benzalkonium + sodium naphthaleneacetate The plant height of sodium nitrophenolate was 42.5cm at a moderate concentration,while the water control was 22.6cm.Each treatment had a significant effect on cotton stem thickness,which was significantly different from that of the clear water control;single compound sodium nitrophenolate and single sodium naphthalene acetate pair Cotton plant height has an obvious promotion effect,but the cotton stalks are relatively thin.At the same time,studies have shown that foliar spraying melanine also has a good promotion effect on cotton plant height.2.The effects of different plant growth regulators on Cotton Biomass Accumulation at Seedling StageFoliar spraying of benzalkonium + sodium nitrophenolate and benzalkonium + sodium naphthalene acetate has a significant effect on the accumulation of cotton cotton biomass,which is significantly different than the clear water control(CK),and has a significant effect on the fresh weight of cotton leaves.Stem fresh weight,root fresh weight,leaf dry weight,stem dry weight,root dry weight,all have a good promoting effect.Enhance nutrient absorption and storage,laying a good foundation for later nutrient growth to reproductive growth.The aboveground biomass accumulation increased significantly 10 days after application,and the underground increased significantly after 20-30 days after application,indicating that foliar spraying of plant growth regulators can promote underground biomass accumulation,but absorption,Conduction takes a certain amount of time.At the same time,studies have shown that foliar spraying of melanine has no obvious effect on the biomass accumulation of cotton underground.3.The effects of different plant growth regulators at the seedling stage on the protective enzyme content of cotton leaves10 days after application,the contents of MDA and SOD in the cotton leaves of DCSN2 and DSNA3 treatments were significantly different from those of meepamine and water control,which significantly reduced the MDA content of leaves and increased the SOD content;20 days after application,DCSN2 treatment The CAT content of cotton leaves treated with DSNA3 was significantly different from that of the clear water control,and the CAT content was significantly increased;30 days after application,the POD content of cotton leaves treated with DCSN2 was significantly different from that of the clear water control,and the POD content was increased.The control increased the content of SOD,POD,and CAT to varying degrees,and decreased the MDA content of cotton leaves,but the effect was not obvious.Foliar spraying of benzalkonium + sodium nitrophenolate and benzalkonium + sodium naphthalene acetate increased the content of SOD,POD and CAT in cotton leaves,lowered the content of MDA,effectively eliminated oxygen free radicals in the plant,and maintained normal Physiological metabolism enhances the ability of cotton to resist adversity.4.The effects of different plant growth regulators on cotton yield and quality at seedling stageThe effects of each treatment on the central boll of cotton were not obvious;the treatment of DCSN2 had a significant promotion effect on the lower boll;and the treatment of DSNA3 had a significant promotion effect on the upper boll of cotton.Spraying plant regulators on foliage increased the number of bolls per plant and the weight of bolls per plant compared with the clear water control(CK),but the impact did not reach a significant level.The three groups of DCSN2,DCSN3 and DSNA3 had more obvious effect on increasing production than other treatments.The micronaire value of the cotton treated with DPC(DPC)is the best,and the fiber length and fiber uniformity of the cotton treated with DCSN2 are better.DCSN2 and DSNA3 treatment increased the elongation of cotton fiber.