| Sunflower is the fourth largest oil crop of China, and it has high economic value andnutritional value. In the situation of water-saving and salt-controlling in the salinization ofirrigation area, in order to improve the quality of oil sunflowe, it was necessary to achievethe water-fertilizer-salt optimal coupling under reasonable irrigation and fertilizationbesides choosing the fine varieties. This practical problem was regared as the breakthroughpoint of this PhD thesis. The experiment was based on the Hetaoirrigation zone, and the oilsunflower variety of Kangdi T562was used as the instructions crops, and the characterizeindicated the quality of the oil sunflower: fat, protein, oleic acid, linoleic acid, linolenicacid, an unsaturated fatty acid, palmitic acid, palm oilacid, stearic acid, saturated fattyacids was used as the study object. The thesis research the effect of sunflower qualitydynamic response on the condition of water-fertilizer-salt coupling in the salinizationdistrict.Data analysis software SPSS19.0and Origin Pro8.6was used data analysis, based onfactor analysis10-dimensional data space of tested data was curreied out to reducedimensionality and concise data structure.The results showed the data space characterized sunflower quality was continuouschanged dynamically over time, and the aggregation phenomenon of qualitycharacterization was founded in same time of sampling points. Cumulative total factorscore by calculating the sample points It was obtained the typical period was respectively4weeks after flowering in mild saline experimental field in2011, and3weeks afterflowering in mild saline experimental field in2012, and4.3weeks after flowering inmoderate saline experimental field in2011, and4.3weeks after flowering in moderatesaline experimental field in2012.Based on curve fitting, it was achieved the specific depiction of cumulative process ofcrude fat, protein and fatty acid composition of sunflower from the beginning of seedformation to the final maturity under water-fertilizer-salt coupling conditions by meansof OriginPro8.6DPS V7.05softerware analysis, and revealed the growth curves of crudefat content that fit with the Exponential function in mathematics; The growth curve of oleicacid content fit with a2-equation with a3equation of the form; the growth curve oflinolenic acid content fit with the gradual regression model; unsaturated fatty acid contentfit with the2-equation with a3-equation form. Meanwhile, the eigenvalues including critical value Ycr, the critical period and average accumulation rate were determinedduring the cumulative process of these characterizations.Based on the cluster analysis, the response effect of water-fertilizer-salt coupling onthe oil sunflower quality characterizations in typical period and mature period wasachieved by the means of softer ware analysis of Matlab R2011b, OriginPro8.6. Theresults showed that there were interactions of water, fertilizer, and salt on the oil sunflowerquality formation. the soil moisture conditions obtained by irrigation or rainfallaccompanied by top dressing N fertilizer can be able to quickly and effectively meet thenitrogen need avoiding the losses of urea with evaporation, and promote the N fertilizerabsorption and utilization of oil sunflower, so that increase the protein synthesis of oilsunflower seed during the typical period and mature period. It was mutually exclusivebetween the synthesis of fat, saturated fatty acids, linoleic acid and protein of oil sunflower.When the water conditions of soil by irrigation rainfall accompanied with top dressing Nfertilizer exceeded the demand for fertilizer dissolved, hydrolysis, absorption, andtransportation in the soil, it was disadvantageous of over water on the protein synthesis notonly during typical period but also mature period. But, it was conducive to the synthesis offat, unsaturated fatty acid, linoleic acid in the typical period as well as the mature period. Ifthe soil and water environment by the irrigation and rainfall companied with top dressingN fertilizer was not able to meet the urea fertilizer effective demand, over quantity offertilizer was equivalent to increase the degree of soil salinization, which was detrimentalon the protein synthesis is of sunflower. At the same time, the degree of soil salinizationwas unfavorable factors on the synthesis of crude fat, unsaturated fatty acids, linoleic acid.But, the synthesis of saturated fatty acid was not sensitive to the outside soil and waterenvironment as for its stable ability.After in-depth analysis to characterize the quality indicators, canonical correlationanalysis was used as the theoretical basis, and the response effect of oil sunflower qualityindicators on the water and fertilizer salts was carried out by the means of softerwareanalysis of OriginPro8.6, DPS v7.05.The results showed that the different levels ofirrigation has a significant influence on the quality of oil sunflower in the mildexperimental field, and there was not significant influence of irrigation level on thecorresponding quality of oil sunflower production in the moderate saline experimental field.In mild and moderate saline experimental field, there was not a significant effect of thedifferent N fertilizer on the quality of oil sunflower. There was very significant effect ofsalt on the quality of oil sunflower in the mild and moderate saline experimental field. In aword, the most sensitive factor on the quality of oil sunflower was salt compared to water,fertilizer, and salt conditions. The research results may provide the irrigation, fertilization technical parameters and theoretical support on industrial development of the high-qualityoil sunflower to in the salinization of irrigation zone. |
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