Perlis is small, dry by Malaysian standards, and geologically distinctive — limestone hills shed calcium into surrounding soils, which changes the pH picture and therefore the nutrient availability picture.
Perlis paddy sits on alluvial plains flanked by prominent limestone hills, and that limestone influence raises pH and calcium status in nearby soils rather than leaving them strongly acidic like much of Malaysia. Elsewhere in the state the plain carries more typical clay alluvium.
This inverts one common assumption. Where limestone influence is strong, acidity is not the limiting factor and liming can be unnecessary or counterproductive; instead phosphorus and some micronutrients can become less available at higher pH, and zinc and iron deficiency are more plausible than aluminium toxicity.
Perlis is among the driest states in Malaysia, with a pronounced dry period early in the year and rainfall concentrated in the southwest monsoon from roughly May to October. Water availability is a real constraint on cropping intensity.
Nutrient demand, challenges, application timing and the products we recommend for rice.
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