אסיף מאגר המחקר החקלאי

Studies in clover soil sickness - III. The distribution of clover soil sickness factors in soil layers and the response of factors to sterilization

Year:

1972

Source of publication :

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Volume :

37

Co-Authors:

Katznelson, J., The Volcani Institute of Agricultural Research, New Ya'ar Experiment Station, Post Haifa, Israel

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Abstract:

The nature of clover soil sickness (CSS) was studied in pot experiments using soils on which berseem had been grown for three, two, one and no years. Both the distribution of CSS with soil depth, and the effect of soil sterilization by dry heat and methyl bromide on the manifestation of CSS in berseem and Persian clover, were studied. CSS factors disappeared in berseem following heat sterilization and in both Persian clover and berseem following methyl bromide treatment. The CSS phenomenon was found in berseem grown on soil from the 0-20-cm and 60-80-cm soil layers of three-year berseem plots. The effect of upper layer-CSS was discernible only after the first harvest, while that of the deep layer one affected growth drastically immediately after germination. Other possible CSS factors are suggested. © 1972 Martinus Nijhoff.

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