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However, the interval from the application of fertilizer vary between farmers and rubber plantation estates sometimes not fertilized during the year (personal communication owner of the plot). Furthermore, lime is added at irregular intervals for rubber and oil palm plantations. One farmer also gave limestone in 2013 with an average of 200 kg of dolomite ha-1 yr-1. Weeding manually grass and chemistry takes place throughout the year in rubber and oil palm plantations with herbicides most commonly used is Gramoxone® and Roundup; both diaplikasikanyakni between 2 to 5 L herbicide ha-1 yr-1 (Euler et al., unpublished data) .Hutan rubber is usually not systematically fostered or treated with herbicides. All plots are at a minimum distance of 300 m from each other.
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