This study aimed to determine the genetic diversity and fruits quality of the "Jeruk Bali" cultivars grown in Bali. This research was conducted in all regencies and city in Bali, during 2016. Furthermore, several cultivars of “Jeruk Bali” were genetically analyzed based on RAPD markers using 10 primers. Analysis of the quality of fruit is based on physical properties and chemical content. Eighteen cultivars of "Jeruk Bali" obtained have a fruit morphological character with round, short round, and piriform fruit shapes, which are red, pink, cream and white flesh color. RAPD analysis results at 53% similarity level are grouped into 5 groups. The first group was only one cultivar, the second group consisted of 13 cultivars, the third and fourth groups were only one cultivar, while the fifth group consisted of two cultivars. The analysis of the diversity between cultivars based on the combination of physical and chemical properties of the fruit with hierarchy method on similarity level about 85% in a group is obtained by 4 (four) groups. Groupings by combination of physical and chemical properties of the fruit are not synchronized in their entirety with dendograms based on their genetic diversity. This illustrates the physico-chemical properties of “Jeruk Bali” fruit in general is not fully genetical expressed, but also influenced by conditions of environmental growth.

Pummelo in Balinese speaking is called Jerungga, Jeruti, Muntis, Juuk Saba, Juuk Bona or Juuk Gede. Morphologically and genetically, pummelo in Bali is known to be 5 (five) types of cultivars. The main cause of the decline in the population of pummelo plants in Bali is due to infection with blendok disease caused by the fungus Botryodiplodia theobromae Path. Characterization of the pathogen causing blendok disease is needed to determine the characteristics and pathogenicity of the fungus in pummelo plants. This is useful for determining how to control it effectively. The results showed that the pathogen of blendok disease in Bali was the fungus Botryodiplodia theobromae which had a gray color in the early stages of growth. This fungus has a shape like cotton and has abundant air between the micelles. The conidium is oval, one insulated, dark in color and the exospores have pathways. On the first day, the area of B. theobromae colonies was 1.13 cm2. Furthermore, on the second day to the fifth day experienced a rapid growth rate that reached 75.46 cm2. Growth rate, the fungus B. theobromae grows faster than the control fungus which is often referred to as the biological agent Trichoderma atroviride and Gliocladium sp.

This study aims to determine the ability of Trichoderma atroviride and Gliocladium sp. in inhibiting the fungus that causes Gumosis disease Botryodiplodia theobromae. This study used a completely randomized design with two single treatments and was repeated eight times. In the in-vitro antagonism test Trichoderma atroviride and Gliolcadium sp. can inhibit the fungus Botryodiplodia theobromae as well. The percentage of inhibition was 94.58% in the Trichoderma atroviride antagonism test and 81.67% in the Gliocladium sp. antagonism test. Whereas the Botryodiplodia theobromae Colony Area had no significant effect on both treatments. Each Botryodiplodia theobromae Colony area is 18.34 cm2 with T. atroviride treatments and 22.25 cm2 with Gliocladium sp. treatment. The growth rate of Botryodiplodia Theobroma fungi was superior to that of Trichoderma atroviride and Gliocladium sp.

This research was carried out at Kintamani District, Bangli Regency, Bali-Indonesia, from February to October 2019 with aimed to overcome the failure of fruit-set and fruit drop of Siam orange on off-season period through application of mycorrhizal inoculants and ZnSO4 micro fertilizer dosage. This experiment was arranged as a randomized block design consisted of 2 factors.  The first factor was mycorrhizal inoculant (0, 50, 100 and 150 g/tree), while the second factor was the dosage of ZnSO4 micro fertilizer (0, 5, 10 g/tree). All treatments were repeated 3 times. The results showed that the interaction between mycorrhizal inoculant treatment and ZnSO4 micro fertilizer dosage did not significantly affect all of the variables observed.  Mycorrhizal inoculant dose 150 g/tree could overcome the failure of fruit-set and fruit drop and improved the quantity and quality of fruit of Siam oranges on off-season, which was reflected by increased number of fruits harvest per tree (249,00 fruits), weight per fruit (106,10 g), weight of fruit harvested per tree (26,34 kg) and total dissolved solids (13.52% Brix), or increase 31,44%; 18,15%; 54,58%; and 35,74%, respectively, compared to without mycorrhizal inoculant i.e 189,44 fruit; 17,04 kg; 89,80 g and 9,96% Brix.

Intercropping is a crop cultivation system where more than one plant is planted in one planting area, this is used to maximize land function and increase farmers' income. The aim of the study was to obtain the response of growth and yield of intercropping to reducing doses of inorganic fertilizers with organic fertilizers, in order to obtain the optimal dosage mix.  The research was conducted in rice fields in Subak Rapuan, Banjar Tarukan, Mas Village, Ubud, Gianyar. This experiment is a factorial experiment with a Randomized Block Design (RAK) which consists of two factors, namely organic fertilizer kerambitan agro (K) consisting of 4 levels: K0 = 0 ton.ha-1;  K1 = 10 ton.ha-1 ; K2 = 20 ton.ha-1; K3  = 30 ton.ha-1and the dose of NPK Mutiara fertilizer consisted of 3 levels, namely N1= 100 kg.ha-1 ; N2= 200 kg.ha-1 N3=  300 kg.ha-1 . The results showed that the interaction of organic fertilizers with inorganic fertilizers had no significant effect (P≥0.05) on all observed variables.