Theory of Planned Behaviour is useful for predicting smallholder planters' intention to supply oil palm residue.
Relationships between attitudinal belief and the Theory of Planned Behaviour core constructs are explored.
Smallholder planters are concerned with existing fresh fruit bunches harvest when considering oil palm residue collection.
Subjective norm has the largest effect in predicting smallholder planters' intention.
Perceived ecological effect has limited influence on smallholder planters' intention.