Abstract:
Rain interference reduces the productivity of rubber plantations, particularly due to
exposed tapping panels. While skirt and gutter-type rainguards were introduced to
address this, their adoption in Sri Lanka remains low due to increased labor demands,
annual renewal requirements, and environmental concerns such as polythene waste.
Given their effectiveness, three sizes of hat-type rainguards prototypes were
evaluated during the peak rainy season. Each rainguard had a galvanized iron core,
covered with waterproof rexine, installed at a 30° angle at 1.8 m (6 feet) from the
graft union to optimize rainwater deflection without blocking tapping. Five treatments
were tested: three hat-type rainguards (12, 18, and 24 inches in radius), a conventional
apron-type rain guard, and a control (no rainguard). Each treatment was replicated
thrice, with 10 trees per replication in a randomized complete block design (RCBD).
Measurements: weather data, rain-protected height, leak percentage, distribution of
tapping days, and latex yield were recorded for 30 days. Data were analyzed with
two-way ANOVA at a 0.05 significance level, and treatment comparisons were made
using Duncan’s Test in SAS software. The results demonstrated a significant (p<0.05)
increase in rain protection height. The 24-inch hat-type provided the highest
protection (159.2 cm), followed by the 18-inch hat-type (133.2 cm), and the 12-inch
hat-type (76.0 cm). The apron-type rainguard provided only 47.8 cm of protection
and required annual replacement. Both apron and hat-type recorded 0% leakage. The
control group experienced a significant loss of tapping days, while all rainguards had
similar tapping day distribution. In conclusion, the 24-inch hat-type rainguard offered
the best tapping panel protection. Both rainguard types prevented leakage and
preserved tapping efficiency, outperforming the control. Future research could focus
on developing molds using UV-treated materials for enhanced durability, cost
effectiveness, and environmental sustainability.
