Efikasi Herbisida Isopropilamina Glifosat 480 SL Pada Gulma Perkebunan Karet (Hevea brasiliensis [Muell.] Arg.)

Abstract

Rubber productivity is largely determined by the maintenance of rubber plantations. One aspect of maintenance on rubber plantations is weed management. Weed management using herbicides is an effective and efficient way in terms of time and cost. Glyphosate is the active ingredient of herbicide which is often used in rubber plantations. The objectives of this research are: (1) To know the dose of herbicide isopropylamine glyphosate effective in weed control on rubber plantation yield (2) To know the change of weed composition after application of glyphosate isopropylamine herbicide on rubber plantation yield. The research was carried out at the rubber plantation of the people in Marga Agung Village, Jati Agung Subdistrict, South Lampung Regency and Weed Laboratory of Faculty of Agriculture, Lampung University from August 2019 to November 2019. The study used a randomized block design with 4 replications and 8 treatments are herbicide isopropylamine glyphosate 480 SL dose: 1.080 g/ha, 1.440 g/ha, 1.800 g/ha, 2.160 g/ha, 2.520 g/ha, isopropylamine glyphosate 486 SL dose 1.458 g/ha, mechanical weeding, and control. The homogeneity of various data was tested by Bartlett test, the data additivity was tested by Tukey test, and the difference of median value of treatment was tested by the Smallest Differential test at 5% level. The results showed that: (1) Herbicide isopropylamine glyphosate dose 1.080 – 2.520 g/ha effective controlling total weeds, weeds of grass, wide leaf weeds, weed of puzzle group, Ottochloa nodosa weeds, Imperata cylindrica weeds, Asystasia gangetica weeds, Ageratum conyzoides weeds, and Cyperus kyllingia weeds up to 12 weeks after application (WAA), but at a dose of 1.080 g/ha can only control weed of puzzle group and Cyperus kyllingia weeds up to 8 WAA (2) Herbicide isopropylamine glyphosate dose 1.080 - 2.520 g/ha causing changes in weed composition at 4, 8, and 12 WAA.