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Study On The Effects Of Different Improvement Measures On The Saline-alkali Soil Character And Sunflower Yield In Hetao Irrigation Area

Posted on:2021-04-28Degree:MasterType:Thesis
Country:ChinaCandidate:H M GaoFull Text:PDF
Abstract/Summary:PDF Full Text Request
Agriculture is the source of energy for human beings.Due to the joint actioural factors and human factors,soil hardening,soil acidity and alkalinity,the expansion of saline-alkali land,food production reduction and other problems continue to worsen.Therefore,the treatment of salinization is an important task for China and even the world.According to researchers at home and abroad,desulphurization gypsum,biomass carbon,fulvic acid and humic acid and other improvers in soil improverment and production increase.There,respectively in 2018 and 2019,under the condition of field experiment setting control(CK),biomass carbon(C),desulfurization gypsum(S),humic acid(F),farmyard manure(J),fulvic acid(H)single give desulfurization gypsum and humic acid(SF),desulfurization gypsum and fulvic acid(SH),biomass carbon and fulvic acid(CH),biomass carbon and humic acid(CF)with 10 processing,study saline improver on soil salinity index,soil properties,crop growth index andthe influence of crop yield.It is expected that the improver can have certain effect on improving soil condition and increasing crop yield,so as to find out the more suitable saline improver for the moderste and heavy saline areas in hetao irrigation area.The research results are as follows:1)After two years of soil experiments,it was found that the effects of different modifiers on saline-alkali indexes were different.In terms of soil salinity reduction rate,the relative salinnity reduction rate of the 9 modifier treated plots was higher than that of the control group,among which SF treatment,S treatment and SH treatment had the best salt reduction effect,and the relative salinity reduction rate was 40.03%,24.52%and 12.20%,respectively.Interms of reducing the soil pH value,the pH value of all treatments was lower than the initial value.Compared with CKtreatment,except SF treatment and S treatment,the other treatment significantly reduced the soil pH value.In terms of reducing the total alkalinity of soil,field experiment and laboratory experiment both concluded that H treatment had the best effect on reducing the total alkalinity.In terms of reducing the soil SAS value,all treatment excep F treatment significantly reduced the soil SAS value,and CF treatment had the best effect.2)After two years of soil improvement experiments,soil physical properties have been greatli improved.In terms of promoting the formation of soil aggregates,In 2019,the values of R0.25,MWD and GWD of soil aggregates increased compared with those of 2018,indicating that after two years of soil improvement,different modifiers can promote the formation of aggregates and increase their stability.Among them,the SF treatment increased the values of R0.25,MWD and GWD the most,followed by the F treatment.The SF treatment was better than the single S treatment and F treatment.In terms of reducing soil bulk density,the bulk density of F treatment,SF treatment and CF treatment was significantly reduced,with the bulk density decreased by 10.18%,5.83%and 1.42%compared with last year.The bulk density of other treatments was increased,among which F treatment had the best effect in reducing bulk density.In terms of increasing soil moisture content,biochar has a strong ability to fix water and improve soil moisture content,but a low ability to retain water.3)After two years of soil improvement tests,soil fertility was also improved significantly.In terms of increasing total nitrogen in soil,SF treatment had the best effect on increasing total nitrogen,which was 78.16%higher than that of last year,which was consistent with the results of laboratory experiments.SF treatment had a better effect on increasing total nitrogen in soil than F treatment and S treatment alone.In terms of increasing soil organic matter,except CF treatment,the organic matter in other treatments increased as compared with that before planting,and SF treatment had a better effect on increasing organic matter than single S treatment and F treatment,with an increase of 83.58%compared with last year.Moreover,both indoor and field experiments showed that SF treatment increased organic matter the most.4)After two years of soil improvement experiments,all saline-alkali modifiers canpromote sunflower growth and increase sunflower yield.After C treatment,the effect of increasing plant height was not obvious,but the effect of increasing stem thickness was significant.The application of the improver all contributed to the increase of crop yield,but the stimulation effect was different among different treatments.SF improver had the best stimulation effect.In conclusion,through two-year field experiment and one-year field experiments,it is concluded that SF treatment has the characteristics of promoting the growth and development of crops,increasing yiels,rsducing salinity and improving soil structure,etc.And is the best modification agent suitable for saline-alkali soil in hekou irrigated area,The application amount of humic acid is 0.6 t/hm2,and the application amount of desulfurized gypsum is 3 t/hm2.
Keywords/Search Tags:Desulphuriztion gypsum, Humic acid, soil salinity index, soil properties, Crop growth index
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