Urea Effectivity as Herbicide Adjuvant to Control Weed in Minimum Tillage System Suarna Samai, Muhidin
Department of Biological Education, Faculty of Education, Halu Oleo University
Abstract
Efforts to reduce weed control costs, especially in minimum tillage land, can be done by reducing the dose of herbicide per hectare, and the addition of urea fertilizer replaces this reduction. The research was designed using a randomized block design with three replications. The treatments were application of glyphosate 1.44 kg ha-1, 1.80 kg ha-1, and 2.16 kg ha-1 in combination with without urea- urea 5 kg ha-1, 10 kg ha-1 and 15 kg ha-1, and application on minimum tillage, full tillage and control. The results showed that the addition of adjuvants from urea and glyphosate could control weeds, especially in reed weeds in the mixing of herbicide glyphosate 1.44 kg ha-1 + urea 10 kg ha-1, while herbicides 1.44 kg ha-1 + Urea 5 kg ha-1 and glyphosate 1.80 kg ha-1 + Urea 5 kg ha-1 have the same control power effectiveness as glyphosate dose of 2.16 kg-1, urea dose of 5 kg ha-1 the effectiveness is equal to 1.80 kg ha-1 + Urea 15 kg ha-1. The herbicide glyphosate disrupts metabolism in plants, causing abnormal growth or even killing weeds. Mixing does not cause poisoning of the corn crop. The use of herbicide glyphosate 1.44 kg ha-1 + Urea 10 kg ha-1 is better based on plant poisoning and corn production. The optimum dose that can minimize the weed population is 8.650 grams, and the combination of herbicide Glyphosate and Urea is effective in controlling weeds with minimum conditions at 1.158 grams of glyphosate and 1.146 grams of Urea.
