Kedah is the country’s rice bowl, and the MADA scheme area runs intensive double cropping on heavy clay. Intensity is exactly what strips organic matter out of a paddy soil.
The Kedah paddy plain is dominated by heavy marine and riverine clay — high in clay content, poorly drained by nature, and well suited to holding water for wet cultivation. Under flooding, oxygen falls and the chemistry of phosphorus, iron and several micronutrients shifts with it.
The characteristic problem here is not soil texture but organic matter depletion under intensive double cropping. Two crops a year with heavy chemical inputs and residue removal or burning steadily reduces organic matter, and with it the soil’s buffering capacity and biological activity.
Kedah sits on the northwest, with a wetter southwest monsoon period from roughly May to October and a distinctly drier stretch early in the year. Irrigation scheduling in the MADA area is managed around this, so planting calendars are scheme-driven rather than purely rainfall-driven.
Nutrient demand, challenges, application timing and the products we recommend for rice.
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