Available micronutrient status of major soil types under coconut in healthy and root (wilt) affected tracts of Kerala, India
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Date
2007-02-08
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Abstract
A survey of coconut plantation in Kerala State was carried out. In this, 733 surface soil samples were collected at about 6.5 km intervals and analyzed for available micro nutrients in five major soil types. Because of the low values encountered in a majority of cases, the following soil types are more likely to be deficient of certain elements : coastal sandy and reclaimed marshy soils for Mn, sandy loam soils for Zn, sandy loam and coastal sandy soils for Mo, and coastal sandy soils for B. The distribution of available Cu was uniform in the different soil types excepting coastal sandy soils. The root (wilt) disease affected tracts showed a significant reduction: in the levels of the following micronutrients as compared to healthy tract : Fe, Mn, and Zn in laterite, reclaimed marshy; and coastal sandy soils ; Zn in alluvial soils ; and Mn and Zn in sandy loam soils. The variation in Cu, B, and Mo content in the different soil types between healthy and disease affected tract was negligible. The intensity of deficiency of Mo, Zn, and Mn was 83, 48, and 48 per cent, respectively. The intensity of deficiency of Zn was above 47 per cent in all soil types in only the disease affected tract and that of Mo above 60 per cent in both healthy and disease affected tracts.
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soil micronutrient status, coconut, root (wilt) affected tracts, , ,
Citation
In: Coconut research and development; proceedings of the International symposium, 1st, CPCRI, Kasaragod, 27-31 Dec. 1976. Edited by N. M. Nayar. Wiley Eastern, New Delhi 1983 p-144-151