<p>Chemical fertilizers and agrochemicals contain heavy metal impurities, positioning chemicalized agriculture as the second-largest source of heavy metal contamination after industrial activities. Rubber tree plantations, critical to industrial development, have been widely established in wet tropical countries, including Kerala, South India, for over a century. Despite the regular application of chemical fertilizers and agrochemicals in rubber plantation fields over extended periods, the issue of heavy metal contamination in these plantations remains largely unaddressed. We evaluated, using X-ray fluorescence (XRF) spectroscopy, the presence of chemical fertilizers and other agrochemical-associated heavy metal contaminants, including manganese, iron, chromium, nickel, copper, and zinc, in rubber plantations across various soil types and seasons. The findings revealed elevated heavy metal levels in the order of Fe &gt; Mn &gt; Cr &gt; Zn &gt; Ni &gt; Cu. Most fields exhibited contamination exceeding background levels, with some surpassing WHO limits, indicating severe pollution. Pollution indices indicated moderate contamination that varied by soil type. Monte Carlo simulations have highlighted significant health risks, particularly from carcinogenic metals such as chromium and nickel, which warrant global attention and monitoring of chemicalized perennial tree-crop fields.</p> Graphical abstract <p></p>