Effectiveness of low frequency harvesting systems in rubber smallholder sector of Eastern province (IL2) of Sri Lanka

With no experience on Low Frequency harvesting (LFH) systems in the drier climates, tapping half of the tree circumference once in four days (S/2 d4) instead of traditionally doing once in two days (S/2 d2) was tested in rubber smallholdings established in Eastern Province of Sri Lanka. Yields given by S/2 d4 was slightly higher than that of S/2 d2 and also, found financially more profitable, particularly under hired labour conditions. Quality of raw rubber produced was also not affected by LFH. Seasonal distribution of rubber yields showed that S/2 d4 system outperforms in rainy period whilst yields of S/2 d2 was higher in dry months. Also, demand for labour was higher in the rainy period due to the establishment of seasonal crops. Therefore, it is suggested to apply S/2 d4 only during wet periods (September to March in the following year) and S/2 d2 in dry months (April to August). Reasons for the above responses are also discussed.