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INVESTIGATIONS ON HETERODERA SCHACHTII IN LANCASHIRE AND CHESHIRE PART II. THE RELATIONSHIPS BETWEEN DEGREE OF INFESTATION AND HYGROSCOPIC MOISTURE, LOSS ON IGNITION AND pK VALUE OF THE SOIL
Author(s) -
SMITH A. M.
Publication year - 1929
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1929.tb07140.x
Subject(s) - heterodera schachtii , loss on ignition , soil water , infestation , heterodera , degree (music) , moisture , water content , biology , cyst , zoology , agronomy , environmental chemistry , ecology , chemistry , nematode , materials science , geotechnical engineering , composite material , geology , surgery , medicine , acoustics , physics
SUMMARY.1 Soil samples taken for the purpose of measuring the infestation of Heterodera schachtii have been further examined for any association between cyst concentration and those physico‐chemical properties relating to the moisture, temperature and acidity of the soil. 2 The hygroscopic moisture and loss on ignition have been determined for three typical series of ten samples having significant variations in cyst counts. There is no simple association of the observations within any of the series. It appears improbable, therefore, that the rate of reproduction of Heterodera schachtii is influenced to a marked degree by the normal variations in the physical condition of the soil. 3 The p H of seventy‐eight samples has been measured electro‐metrically. When the samples are divided into two groups according to soil type, there is found to be a significant negative correlation between pK and cyst count for fifty‐three peat soils. There is not, however, a significant correlation in the case of the other twenty‐five sandy soils.