Influence Several Method Applications Of Napthalene Acetic Acid (NAA) + Napthalene Acetamide (Naam) and Various Composition Of Planting Media On Wet Weight And Dry Weight Of Rubber Stumps (Hevea brasiliensis Muell - Arg.)

Abstract

One of the problems faced in rubber cultivation by stump was the high percentage of stump deaths in the field due to the inhibition of root and shoot growth. So that to accelerate root growth can be done by giving growth regulating substances Napthalene acetic acid (NAA) + Napthalene acetamide (NAAm). The purpose of The study was to examine the rubber stump growth response to several methods of application of Napthalene Acetic Acid (NAA) + Napthalene Acetamide (NAAm) and enrich the NAA + NAAm application method on rubber stumps and various composition of growing media. The study was conducted from June 2017 to September 2017 in the research area of ​​the Faculty of Agriculture, University of North Sumatra, Medan. The research design used was a factorial completely randomized design with two factors and three replications, the first factor was NAA + NAAm application (without polishing, polishing on the whole root stump, polishing on cutting stump root cutting, polishing at the lateral root stump) and the second factor is the comparison of the top soil and sand growing media (1: 0, 1: 1, 1: 2, 1: 3). Parameters observed were flexion velocity, shoot percentage, shoot height, shoot diameter, number of leaves, root fresh weight, root dry weight, fresh canopy weight, dry weight of shoot.The results showed that the application of NAA + NAAm did not have a significant effect on all parameters where the results tended to be the best was polishing on the roots of lateral stump (P3). The ratio of the Measuring plantdid not significantly affect all parameters where the interaction between NAA + NAAm application and the composition of the growing medium tended to be the best in the combination of P3M1.