摘要
为探明马铃薯品质与根区土壤养分间的复杂关系,从而为西北干旱地区马铃薯生产精准灌水施肥提供科学依据。以该地区常种植的57个不同品种马铃薯为研究对象,分别测取各块茎品质和根区土壤养分。采用变量重要性投影法(VIP)筛选出影响马铃薯品质的重要土壤养分因子,同时利用偏最小二乘回归(PLSR)建立马铃薯品质与土壤养分因子的回归方程模型。结果表明,影响西北地区马铃薯品质的主要养分因子为土壤电导率、速效钾、硝态氮和含水量。土壤硝态氮是影响马铃薯产量和维生素C的首要土壤养分因子。土壤电导率是影响马铃薯淀粉、粗蛋白和多酚氧化酶活性的首要土壤养分因子。土壤速效钾与马铃薯的还原糖呈极显著负相关关系,与可溶性总糖呈显著负相关关系。因此,通过调控土壤电导率,适量增施钾肥和氮肥是提高西北地区马铃薯品质的有效途径。
In order to explore the complex relationship between potato quality and soil nutrients in root zone,so as to provide scientific basis for precise irrigation and fertilization of potato production in arid area of Northwest China.In this study,57 different varieties of potatoes often planted in this area were taken as the research object,and the tuber quality and soil nutrients in the root zone were measured respectively.The important soil nutrient factors affecting potato quality were selected by variable importance projection(VIP),and the regression equation model between potato quality and soil nutrient factors was established by partial least squares regression(PLSR).The results showed that the main nutrient factors affecting potato quality in Northwest China were soil conductivity,available potassium,nitrate nitrogen and water content.Soil nitrate nitrogen is the primary soil nutrient factor affecting potato yield and vitamin C.Soil conductivity is the primary soil nutrient factor affecting the activities of potato starch,crude protein and polyphenol oxidase.There was a very significant negative correlation between soil available potassium and potato reducing sugar,and a significant negative correlation with total soluble sugar.Therefore,it is an effective way to improve the quality of potato in Northwest China by regulating soil conductivity and increasing the application of potassium fertilizer and nitrogen fertilizer.
作者
张帆
李源
陈梦茹
邢英英
党菲菲
王秀康
ZHANG Fan;LI Yuan;CHEN Meng-ru;XING Ying-ying;DANG Fei-fei;WANG Xiu-kang(College of Life Sciences,Yan'an University,Yan'an 716000,Shaanxi Province,China;Yan'an Agricultural Science Research Institute,Yan'an 716000,Shaanxi Province,China)
出处
《节水灌溉》
北大核心
2022年第10期8-14,共7页
Water Saving Irrigation
基金
国家自然科学基金项目(51809224,52169014)。
关键词
马铃薯
品质
硝态氮
速效钾
土壤养分
含水量
potato
quality
nitrate nitrogen
available potassium
soil nutrients
water content
