Pertumbuhan Vegetatif, Akar, dan Nodula Tanaman Kacang Hijau (Vigna radiata L.) Akibat Pemberian Kompos Azolla (Azolla pinnata) Bentuk Pellet dan Calsium Carbonate (CaCO3) Tanah Ultisols Masam

Ultisols are the most extensive land order, reaching 48.3 million hectares or 29.7% of the land area of Indonesia. Development of food crops and horticulture farming on this land will face many obstacles related to the nature of this land. Ultisols are soil that is sensitive to erosion, low fertility and reacts sourly to very acidic.Ultisols are generally low in soil fertility caused by high levels of acidity, low nutrient content of N, P, K, Ca, Mg, S and Mo and high levels of Al, Fe and Mn elements which often reach levels that are harmful to growth. . In addition, the high element Al, Fe da Mn in Ultisols can also bind P nutrients into insoluble and not available to plants. This study aims to obtain the composition of azolla (Azolla pinnata) form of pellets and calcium carbonate (CaCO3) which can provide the highest growth and yield of mungbean (Vigna radiata) plants in acidic Ultisols. The study was carried out in the Lampung State Polytechnic practice garden, from July 2018 to October 2018. The study was arranged in factorial in a randomized block design (RBD) with 16 treatment combinations and 3 replications, so that there were 48 experimental units. The treatment combination is as follows: The first factor is the dose of pelleted azolla compost (A) which consists of 4 levels, namely: a0 = without azolla compost, a1 = 10 tons ha-1, a2 = 20 tons ha-1, and a3 = 30 tons ha- 1. The second factor is the Dolomite dose (D) which consists of 4 levels, namely: c0 = without dolomite c1 = 1.5 tons Ha-1Dolomite, c2 = 3 tons Ha- 1Dolomite, and c3 = 4 tons Ha-1 Dolomite. The target to be achieved in this study is to find out the response of the variables observed, namely: (1) plant dry weight (g), (2) root dry weight and (3) number of root nodules (grains). Pelleted azolla compost increase the growth of root nodules, root dry weight and shoot dry weight of mung bean on the Taman Bogo Lampung Ultisols soil. Dolomite increases the number of root nodules but has no significant effect on the root dry weight and shoot dry weight of mungbean on the soil of Taman Bogo Lampung Ultisols. Compost azolla and dolomite lime work independently on the lands of the Bogo Lampung Taman Ultisols. Keywords: Ultisol, Pelleted Azolla Compost, Dolomite, Mung Bean (Vigna radiata L