<p>Acclimatization is one of the important processes in banana micro propagation before plantlets/planting materials are ready to be cultivated in the field. <em>Trichoderma </em>sp. are well known as plant promoter fungi that can promote plant growth and increase survival rate of plantlets. The study was arranged in a Completely Randomized Factorial Design with two factors and four replications. The first factors was covering type i.e. 1) individual covering and 2) mass covering. The second factor was the proportion of <em>Trichoderma</em> addition into manure, namely A) manure without the addition of <em>Trichoderma </em>sp<em>.</em> (control), B) <em>Trichoderma</em> sp<em>.</em> : manure =<em> </em>1 : 400 (w/w), C) <em>Trichoderma </em>sp<em>.</em> : manure = 1 : 800 (w/w) and D) <em>Trichoderma </em>sp<em>.</em> : manure = 1 : 1,200 (w/w). The purpose of this study was to investigate the effect of <em>Trichoderma</em> sp<em>. </em>applications and covering types in the growth of banana plantlets cv. Barangan during the acclimatization process. The results showed that the best treatment to induce plantlet growth during the acclimatization process was the addition of <em>Trichoderma </em>sp.: manure with 1 : 400 (w/w) proportion and individual covering. The combination of <em>Trichoderma </em>sp<em>.</em> : manure with 1 : 400 (w/w) proportion and individual covering produced plant height and leaf length 8.5 cm and 4.4 cm, respectively, compared to the treatment without <em>Trichoderma </em>sp<em>. </em>addition that produced plantlets with 6.6 cm height and 3.4 cm leaf length. No significant interaction was shown between <em>Trichoderma </em>sp. proportions and covering types on leaf width, the number of leaves and root length parameters.</p>

Rambutan is a fruit native to Indonesia, which has a high diversity. Indonesian Tropical Fruit Research Institute has a rambutan germplasm collection. The objectives of the research were to identify and classify rambutan germplasm accessions based on morphological characteristics, in order to identify the specific characteristics important for the development of future varieties of rambutan. Collecting data on the 32 accession was conducted in Aripan Experimental Field, Indonesian Tropical Fruit Research Institute from September 2014 to February 2015. Characterization of morphology characters referred to as the Descriptor for Rambutan was published by IPGRI. Cluster analysis based on morphological characteristics successfully separated the accession of rambutan R7 and R11 with 30 other rambutan accessions with the dissimilarity coefficient of 45%. Accession R4 was similar to Sitangkue, R14 was similar to Korong Gadang, and R15 was similar to Sinyonya. Characteristics that can be used to distinguish each of the accession of rambutan were the width of seed, seed thickness, total soluble solids (TSS), fruit diameter, spintern texture and the spintern color. Accession R15 can be developed as a commercial variety, because it has a high yield, and shelf life associated with high fruit weight characteristics and thick rind.

<p class="KataPengantar">There are factors contributed to the growth and development of fruit crop seedling. Microbes are well known as plant growth promotors such as symbiotic mycorrhizae and antagonist fungi, <em>Trichoderma </em>spp. The main objective of this experiment is to find out the best medium composition enriched by beneficial microbes to improve papaya seedling growth. The experiment was conducted at Sumani Experimental Station, Indonesian Tropical Fruit Research Institute, Solok, West Sumatera, Indonesia from August until December 2017. The experiment was arranged in a Randomized Complete Block Design with ten treatments and three replicate blocks. The treatments were ten combinations of media for papaya seedling growth enriched by plant growth promotor microbes. In this experiment, medium soil with additional manure, rice husk charcoal and compost (single or combination) combined with mycorrhizae were used. Also, the effect of <em>Trichoderma </em><em>sp</em><em>.</em> enrichment into media composition were tested in this experiment. Treatments SCRMc and SCRMcT; with its complexity; were the best media composition to promote papaya seedling growth. These treatments resulted in best performance of plant height, stem diameter and number of leaves of papaya seedlings. The additional of <em>Trichoderma </em><em>sp</em><em>.</em> into medium did not show beneficial effect for all parameters in this experiment.</p>

In Indonesia, mangosteen has high potency as an export commodity, but the qualityof the fruit is low. Yellow latex contamination is the the main problem in mangosteen fruit quality. The purpose of this research was to study the potency of sub-micron dolomite to reduce yellow latex contamination. This research was conducted in Guguk district, Lima Puluh Kota regency, West Sumatera province, Indonesia, from June 2016 until March 2017. In this experiment, the productive mangosteen trees (12 years) were used as plant material. This study was arranged in Randomize Complete Block Design, and the treatments were the dosage of sub-micron size of dolomite (30, 60, 90, 120, 150 g per plant). Each unit of treatments consists of three plants and four replications. The results showed that the application 90 g per plant of sub-micron dolomite fertilizer increased Ca level in mangosteen leaves and reduced yellow latex contamination until 19.78%. Application sub-micron dolomite fertilizer above 90 g per plant also tend to reduce the Ca level in mangosteen leaves and increased the yellow latex contamination. While the application 120 g per plant sub micron dolomite increased Mn level in mangosteen leaves, an increase the dosage of sub micron dolomite above 120 g per plant reduced Mn level in mangosteen leaves.

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