Soil Calcium, Magnesium and Potassium Status: Concern for Rice Production in Bangladesh under Unfavorable Ecosystems | Chapter 04 | New Perspectives in International Plant and Soil Research Vol. 1
Unfavorable ecosystems in Bangladesh
are under intense pressure of crop production and climate change impact;
although the relationships of indigenous soil nutrients ratios with crop
performance are yet to be fully explored. Experiments were conducted under
submergence and cold prone areas (agricultural ecological zone, AEZ-3), drought
and cold prone areas (AEZ-26), non-saline tidal flood ecosystem (AEZ-13), char
and saline prone ecosystem (AEZ-18) and haor ecosystem (AEZ-21) for evaluating
rice grain yield with native nutrients ratios. Synergistic and antagonistic
relationships were observed in different AEZ depending on indigenous nutrient
ratios. The K:Ca and K:Mg ratios were playing significant negative role in
AEZ-18 for wet season rice yield; but K:Ca played synergistic role in AEZ-3 and
AEZ-26. In dry season, K:Ca ratio was acting antagonistically in AEZ-3 and
AEZ-13 and K:Mg in AEZ-13. The ratio of K to Ca was acted positively for dry
season Boro rice production in AEZ-18 and AEZ-26. Similarly, K:Mg ratio was
playing synergistic role for Boro rice yield in AEZ-3, AEZ-18 and AEZ-26.
Application of fertilizers improved dry season rice yield significantly in all
AEZ except AEZ-18 compared to indigenous soil fertility. It is concluded that
indigenous soil nutrient ratios play a vital role in improving rice yield under
unfavorable ecosystems in which more K fertilizer need to be applied for
satisfactory rice yield in dry season.
Author(s) Details
Md. Mozammel Haque
Soil Science division,
Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.
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