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A Preliminary Study of the Strawberry Soils Infected by Gray Mold Based on in Situ Electrical Conductivity

Quanzhi Wang, Yangfan Zheng, Lingyi Tang, Yuanhua Wang, Ping Yang, Zhiming Yan

Abstract


Background: Gray mold disease (GMD) is a prevalent disease in fruits and vegetables, and also is one typical disease of strawberry. However, it is difficult to track the spread of the disease by common soil techniques.

Materials and Methods: The soils of the healthy and GMD strawberry in Jurong city, China were studied in this project. The contrasts regarding chemical properties in the two types of soils are excluded based on ATR-IR, X-ray fluorescence, and pH analyzer. In addition, the general particle size distribution of soil aggregates from 0-3.5 mm has no significant differences between the healthy and GMD soils.

Results: In situ electrical conductivity (EC) analysis in the soils shows high sensitivity in monitoring the disease. The healthy soils have the EC values of 0.4-0.8 mS/cm, significantly higher than 0.2-0.5 mS/cm in the GMD soils. The average ratio of the EC values for healthy/GMD is ~ 2. Furthermore, the original EC values (0.4-0.7 mS/cm) before planting approximately match the EC values of the soils for healthy strawberry. This could be due to the ability of the healthy plants to maintain soil electroneutrality, e.g. secretion of ions.

Conclusion: The EC analysis on strawberry soils sheds the light on detecting soil borne disease for strawberry, and could have potentials in its application to other fruits and vegetables. 

 


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