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Open AccessArticle

Impact of Different Shading Levels on Growth, Yield and Quality of Potato (Solanum tuberosum L.)

Department of Agronomy (340), Institute for Crop Science, University of Hohenheim, 70599 Stuttgart, Germany
Centre for Agricultural Technology Augustenberg (LTZ), 76287 Rheinstetten-Forchheim, Germany
Author to whom correspondence should be addressed.
Agronomy 2019, 9(6), 330;
Received: 17 April 2019 / Revised: 15 June 2019 / Accepted: 18 June 2019 / Published: 21 June 2019
(This article belongs to the Special Issue Sustainable Cropping Systems)
In agroforestry systems (AFS), trees shade the understory crop to a certain extent. Potato is considered a shade-tolerant crop and was thus tested under the given total solar irradiance and climatic conditions of Southwestern Germany for its potential suitability in an AFS. To gain a better understanding of the effects of shade on growth, yield and quality; a three-year field experiment with different artificial shading levels (12%, 26% and 50%) was established. Significant changes in growth occurred at 50% shading. While plant emergence was not affected by shade, flowering was slightly delayed by about three days. Days until senescence also showed a delay under 50% shade. The number of tubers per plant and tuber mass per plant were reduced by about 53% and 69% under 50% shade. Depending on the year, tuber dry matter yield showed a decrease of 19–44% at 50% shade, while starch content showed no significant differences under shade compared to unshaded treatment. The number of stems per plant, plant height and foliage mass per plant as well as tuber fraction, black spot bruise and macronutrient content were unaffected. Overall, potato seems to tolerate shading and can therefore be integrated in an AFS, and can cope with a reduced total irradiance up to 26%. View Full-Text
Keywords: potato (Solanum tuberosum); shade; light; yield; growth; quality potato (Solanum tuberosum); shade; light; yield; growth; quality
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Schulz, V.S.; Munz, S.; Stolzenburg, K.; Hartung, J.; Weisenburger, S.; Graeff-Hönninger, S. Impact of Different Shading Levels on Growth, Yield and Quality of Potato (Solanum tuberosum L.). Agronomy 2019, 9, 330.

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