Summary
Growth and nodulation ofAcacia spp. in sand increased with increase in soil moisture to an optimum at 15 per cent soil moisture and this agreed with the occurrence of these species in the more moist sites reported by other workers.
TheAcacia species grew and produced effective nodules at up to 35°C and this is the highest temperature for nodulation so far recorded. It indicated adaptation of these species to the warm and dry conditions of the fields.
Soil reaction affected nodulation more than it affected plant growth. At pH 5–5.5 nodulation was absent while plant growth was as good as at pH 6.5–7.0 which was the optimum level for both growth and effective nodulation. The latter were reduced at pH 8.5–9.0 and therefore the alkaline reaction of the soils in Northern Sudan may be a factor influencing growth of Acacia in that region.
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Habish, H.A. Effect of certain soil conditions on nodulation ofAcacia spp.. Plant Soil 33, 1–6 (1970). https://doi.org/10.1007/BF01378191
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DOI: https://doi.org/10.1007/BF01378191