配方施肥对荔枝苗期抗旱性的影响

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中图分类号：S667.1 文献标识码：A

Effects of Formula Fertilization on Drought Resistance of Litchi Seedlings

DENG Maofeng （Lianjiang Breeding Farm，Lianjiang Guangdong 5244Oo，China）

Abstract：【Objective】The changes in droughtresistanceof lycheeseedlingsunder different fertilization treatments in droughtstressconditions wereanalyzed，withtheexpectationofprovidingreferencesforenhancing thedroughtresistanceof ly cheeandachieving eficientlycheecultivation.【Methods】Litchi（Litchi chinensis Sonn.）cultivar‘Nuomici’wasusedas the test material，andthe mixtureofsandand vermiculite with equal volumeratiowas usedas theseedling substrate.The matrix moisture was controlled by weighing method under the drought condition of 20% . The orthogonal test method was used to set up 25 differentratiosofurea，calciumsuperphosphate，potasiumchlorideand magnesium sulfate fertilization treatments，and thecontrolwasnofertilization.Thesurvivalrateofsedlingsandthechangesofrelatedphysiologicalindexesunderdifferent fertilization treatments wereanalyzed.【Results】Compared withthenon-fertilizedcontrol，optimized fertilizationtreatments improvedseedlingsurvivalrate，reducedleafrelative waterdeficitandrelativeelectricalconductivity，whileincreasinguperoxidedismutase（SOD）activity，chlorophyllcontent，and solublesugar content.Using seedlingsurvivalrate，leaf relative water deficit，relativeelectricalconductivity，SODactivity，chlorophyllcontent，andsoluble sugarcontentas evaluation indices，principal component analysis revealed significant variations in droughtresistance among the 25 fertilization treatments.Among them，the control scored the lowest，while the treatment with urea （50g/plant）+ calcium superphosphate （75g/plant）+ magnesium sulfate （30g/plant） scored the highest. 【Conclusion】 Appropriate formula fertilization can effectively enhance the drought resistance of litchi seedlings.

KeyWords：litchi；drought resistance；fertilization；resistance evaluation

荔枝（LitchichinensisSonn.）口感风味好，市场销售量大，经济效益高。（剩余5718字）