Effects of soil characteristics on the relationship between potato cyst nematodes and yield. I. Water retention |
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Authors: | A Mulder A F Van Der Wal R A J Velema |
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Institution: | (1) H.L. Hilbrands Laboratory for Soil-borne Pests and Diseases, P.O. Box 323, 9400 AH Assen, The Netherlands;(2) Agricultural University Wageningen, Hinkeloordseweg 11, 6703 CK Wageningen, The Netherlands |
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Abstract: | Summary Data from five long-term field experiments on sandy and sandy peat soils were analyzed for the effect of soil type on damage
caused by potato cyst nematodes to potato crops. It was shown that the water retention of the topsoil and the subsoil largely
determined the potential yield level in the different fields. According to Oostenbrink's equation the slopes of the curves
are steeper with increasing yield level, indicating that the higher the potential yield level, the higher the absolute yield
loss. However, when yield was expressed as percentage of maximum yield, yield reduction related to potato cyst nematode density
did not differ significantly, except when tolerant cultivars were grown. Increasing tolerance of cultivars to nematode damage
was reflected in less steep slopes of the yield/nematode density curves. |
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Keywords: | Solanum tuberosum L Globodera rostochiensis G pallida soil type soil pF cultivar damage tolerance |
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