Amorphaluus muelleri has been popular among farmers, with the high demand in the world market. However, the information and knowledge on the provision of seed sources, which is also one of the limiting factors in A. muelleri cultivation technology. This research aimed to identify and characterize the morphological diversity and growth response of A. muelleri plants in polybags with two treatments of growing media as seed sources. This research was conducted in Pakuwon experimental station, the IIBCRI, Sukabumi, from October 2020 – April 2021. The study was conducted in a factorial randomized block design with two factors; source of planting materials (seeds, bulbils, small tubers), and growing media, soil + organic manure (1:1), and soil+organic manure+husk charcoal (1:1:1). The results showed the variability of morphological characters in weight of 100 grains, shape of sources, stem height, age of fully open leaf plants, stem diameter, number of leaves, the emergence of second shoots, canopy diameter, and presence of bulbils. While the results on plant growth rates of the interaction between the factors only occurred on plant height, shoots number, and tuber weight. Planting material from bulbils and growing media with the addition of husk charcoal gave the best response to each variable.

The propagation techniques of robusta coffee by cutting can be accelerated by the application of plant growth-promoting hormones. This study is to determine the efficacy of phytohormone-producing isolates on the growth of two-segment cutting of Robusta coffee. The study was conducted using a non-factorial completely randomized design with 2 replications. The treatments consist of control, synthetic IBA (Rooton-f) with three dilution concentrations, 4 isolates (Rhodococcus qingshengii, Burkholderia ambifaria, and Bacillus wiedmannii; fungi Aspergillus niger) with three dilution concentrations. Observed parameters included a percentage of live cuttings, percentage of cuttings sprouted, percentage of rooted cuttings, plant height, number of shoots, number of internodes, number of leaves, number of primary roots, primary root length, and primary root diameter. The results showed that the B. wiedmannii treatment had the best performance compared to other treatments because this isolate produced the highest number of primary roots (4.60) and primary root diameters (2.97 mm) compared to other treatments including control and Rooton-f. This is related to its ability to produce phytohormones that can stimulate the root growth of coffee robusta cuttings.

The growth of macadamia seedlings takes ± 1 year to become rootstock or planted in the garden. Acceleration of seedling growth can be accelerated through NPK fertilization by a watering system. The advantage of the watering system is easy to apply and the response of the seeds is faster because the fertilizer is immediately absorbed by the roots and leaves. The study aimed to determine the application time of NPK fertilization with the best watering system for the growth of macadamia seedlings. The experiment was carried out in a greenhouse at Indonesian Industrial and Beverages Crops Research Institutes(IIBCRI) Sukabumi Regency West Java, from September 2020 to February 2021. The study was conducted by a randomized block design with 5 treatments (application times of NPK fertilizer by watering). Types of treatments are : (P1) once a week, (P2) every 2 weeks, (P3) every 3 weeks, (P4) 4 weeks, and (P0) watering without fertilizer once a week. The experimental results showed that watering NPK fertilizer intervals of 2 weeks were the best treatment for the growth of macadamia seedlings with a height of up to 16 cm, a number of leaves (13.2) strands, root length of 19.82 cm, and dry weight, a total of 8.01 and a root-shoot ratio of 3.77. The dose and application time of NPK fertilizer can be used as information for effective and efficient fertilization so that it can be recommended as balanced fertilization to support sustainable agriculture.