JURNAL AGRISA

EFFICIENCY AND OPTIMUM DOSAGE OF PHOSPHATE FERTILIZER AND YIELD OF GLUTINOUS CORN (Zea mays ceratina L.) INOCULATED WITH INDIGENOUS PHOSPHATE SOLUBILIZING BACTERIA (PSB) IN ALFISOL

Gregorius Putra Jansen — 2025-03-05

The use of phosphate-solubilizing microorganisms combined with chemical fertilizers is very important, especially in soils that contain a lot of calcium. This is due to orthophosphate ions easily bind to calcium and these microorganisms are able to dissolve the fixed phosphate. The research has been conducted at the Faperta Undana experimental garden and took place from June 2023 to February 2024. The purpose of this study was to determine the interaction between phosphate-solubilizing bacteria (PSB) inoculation and phospahate fertilizer on the availability of P, population of PSB, fertilization efficiency and yield of glutinous corn, and to identify the combination that give the best result on the variables observed. The study was designed using a Completely Randomized Design. The first factor was PSB inoculation that consists of : without PSB inoculation and indigenous PSB inoculation. The second factor was the dose of P fertilizer with five levels as follows: 0%, 25%, 50%, 75%, and 100%. Data were analyzed using analysis of variance, followed by the Duncan Multiple Range Test if significant effects were found. Observed variables included PSB population, available P, fertilization efficiency, weight of corn without husks. The results showed that the interaction between PSB inoculation and the dose of SP-36 fertilizer had a significant effect only on fertilization efficiency. The single factor of PSB inoculation significantly affected the availability of P and PSB population, while the single factor of SP-36 fertilizer dose significantly affected fertilization efficiency, available P, and corn weight per cob without husks.

EXPLORATION AND IDENTIFICATION ENTOMOPATHOGENS FUNGI ON HORTICULTURAL CROPS IN BOENTUKA VILLAGE, BATU PUTIH DISTRICT, SOUTH CENTRAL TIMOR

Yonce Melyanus Killa — 2025-03-05

Entomopathogen fungi are fungi that become pathogens in insects. This fungus lives, grows, and develops by taking nutrients from the host it is infected with so that the host is disrupted in its metabolism and will then die. This research aims to identify entomopathogen fungi from horticultural plants in Boentuka Village, Batu Putih District, South Central Timor. This research has been carried out from July to October 2022. Sampling of dead insects or infected with entomopathogenic fungi and soil was carried out in Boentuka Village while isolation and identification of entomopathogen fungi were carried out in the Microbiology laboratory, Faculty of Agriculture, Universitas Nusa Cendana. This research uses a purposive sampling method by taking samples based on observations of insects infected with entomopathogen fungi, which are then stored in sample bottles. In addition, soil samples from the site of the entomopathogen fungi attack were also taken and taken to the laboratory, with Tenebrio molitor larvae being used as bait to catch the entomopathogen fungi. The fungi that grew on the larvae and samples of the insects was then isolated and identified. The parameters of observation are the characteristics of isolates that grow macroscopically and microscopicly. The results of the research obtained four isolates of entomopathogen fungi Aspergillus flavus, Aspergillus niger, Beauvaria bassiana, and Fusarium sp. In the future, this isolate will be tested for its ability as a biological agent for pest control in vitro and in vivo.

THE DOSAGE EFFECT OF TRICHOCOMPOST COW MANURE AND UREA FERTILIZER ON THE GROWTH AND YIELD OF SAMHONG MUSTARD PLANTS (Brassica juncea L.)

Oswaldus Emanuel R. Kelen — 2025-03-05

This research was conducted at the UPT Land: Archipelago Dry Land Laboratory, Nusa Cendana University, Kupang from February to May 2024. The purpose of this research was to determine the interaction effect of trichocompost fertilizer dose and urea fertilizer dose on the growth and yield of Samhong mustard greens (Brassica juncea L.) and to determine the treatment of trichocompost fertilizer dose and urea fertilizer dose that provides the best growth and yield of Samhong mustard greens (Brassica juncea L.). This research was designed using a Factorial Randomized Group Design (RAK) consisting of two factors, the first factor is the dose factor of trichocompost fertilizer which consists of three treatment levels, namely 0, 90 g/plant, and 180g/plant. The second factor is the urea fertilizer dosage factor with five treatment levels, namely 0; 0.6 g/plant; 1.2 g/plant; 1.8 g/plant; and 2.4 g/plant. As a result, 15 treatment combinations were made in three groups, totaling 45 experimental units. Each experimental unit consisted of 24 plants and 8 plants were used as sample plants, so there were 1080 plants. The results showed that the interaction of trichocompost fertilizer dose treatment had a real effect on the observation variables of plant height, gross wet fresh weight per plot, and net wet fresh weight per plot. The dose of trichocompost fertilizer 180 g/plant and the dose of urea fertilizer 1.2 g/plant gave the best effect on plant height increase of 19.88 cm/30 days after transplanting (DAT). The dose of trichocompost fertilizer 180 g/plant and the dose of urea fertilizer 2.4 g/plant gave the best effect on gross wet fresh weight of 6250.67 g/1,44 m² and net wet fresh weight of 5570.67 g/1,44 m²

INVENTORY OF PESTS AND DISEASES ON LIME PLANTS (CITRUS AURANTIFOLIA) IN OELBUBUK VILLAGE, SOUTH CENTRAL TIMOR

Oktavianus Agut — 2025-03-05

This research was conducted in Oelbubuk Village, TTS Regency from October to December 2022. The purpose of this study was to determine the types of pests and causes of diseases that attack lime plants. The method used in this research is the survey method. Sampling was done by selecting villages where there are many limes. Sampling of pests is done with hands that have been coated with gloves, put into a jar containing 70% alcohol, while the diseased parts of the plant are taken stems, leaves, diseased fruit are taken and put into plastic samples and labeled, then taken to the Plant Pest Laboratory and Plant Disease Laboratory, Faculty of Agriculture, Uiversitas Nusa Cendana to be identified. The results showed that in lime plants in Oelbubuk Village, South Central Timor Regency, 6 pest species were found, namely whitefly (Bemisia tabaci), wood locust (Valanga nigricornis), leaf hopper caterpillar (Phyllocnistis citrella), snail (Caracolus marginella), mealybug (Paracoccus marginatus), leafworm (Papilio demoleus); and 4 diseases, namely leaf spot, powdery mildew, sooty mildew, and mumps/diplodia.