土壤养分与冬枣果实品质关系的多元回归分析

Multiple Regression Analysis of Relationship Between Soil Nutrients and Fruit Quality of Dongzao Jujube

以临猗县冬枣种植区土壤与果实样品为试材,测定了土壤养分含量与果实品质指标及果实品质与土壤肥力之间的相关关系,再用多元逐步回归方法筛选出土壤养分与品质最优线性回归关系,以期为当地合理施肥、提高肥料利用效率提供参考依据。结果表明:单果质量与有效锰呈负相关,与交换性钙呈正相关,有效硼影响较弱;果形指数与交换性钙呈负相关,有效锌影响较弱;维生素C含量与有机质、有效硼呈正相关,与有效铁、交换性钙呈负相关;可滴定酸与有效钾、有效磷呈正相关,有效铁影响较弱;可溶性固形物与交换性钙呈负相关,有效钾则影响较弱。冬枣果实品质受多个土壤养分因子共同影响,应依据土壤养分水平和对品质影响的效应,更有针对性的施肥,避免盲目施肥造成浪费和环境污染。

Soil and fruit samples collected from Dongzao jujube planting area in Linyi County were used as test material.The soil nutrient content and fruit quality index were determined.The correlation between fruit quality and soil fertility was studied, and then the optimal linear regression relationship between soil nutrient and quality was screened by multiple stepwise regression method, in order to provide reference for local rational fertilization and improving fertilizer utilization efficiency.The results showed that single fruit weight was negatively correlated with available manganese, positively correlated with exchangeable calcium, and weakly affected by available boron;fruit shape index was negatively correlated with exchangeable calcium, and weakly affected by available zinc;vitamin C content was positively correlated with organic matter and available boron,and negatively correlated with available iron and exchangeable calcium;titratable acid was positively correlated with available potassium and available phosphorus,and significantly affected by available iron.There was a negative correlation between soluble solids and exchangeable calcium,but the effect of available potassium was less.The fruit quality of Dongzao jujube was affected by many soil nutrient factors.More targeted fertilization should be carried out according to the soil nutrient level and the effect on the quality,so as to avoid waste and environmental pollution caused by blind fertilization.