Compost application can contribute to agricultural sustaniability that it has proven to improve soil quality and crops yield. One of the ingredients can be made of china violet that mostly found as weeds in oil palm and rubber plantation. The aims of this study were to evaluate the effect of compost application on soil properties of Ultisol and peanut yield. The experiment was carried out at the Experimental Field of Agriculture Faculty, University of Jambi, Mendalo Darat, Jambi. The treatments were arranged in a rondomly blocked design consisting of (i) control (without compost), (ii) 5 Mg ha-1 compost, (iii) 10 Mg ha-1 compost, (iv) 15 Mg ha-1 compost, and (v) 20 Mg ha-1 compost. The results of study showed that the application of compost improve the soil chemical properties by increasing soil pH, CEC, N, P, and K. In addition peanut yield was increased by compost application. The highest increase in peanut yield was achieved by application of 20 Mg ha-1 compost.

<p>Ultisols have considerable potential in developing agricultural cultivation, but in their management, they face several obstacles, including physical properties that do not adequately support plant growth. The low content of soil organic matter causes poor soil physical properties. Low organic matter content leads to low soil aggregate stability, obstructing pore distribution and infiltration so the soil can easily become compacted. This study aimed to observe the changes in some physical properties of the soil due to the application of cow manure and <em>Gliricidia sepium</em> pruning compost and its effect on the yield of soybean plants. This study used a randomized block design with five treatments, namely, K0 (without cow manure-Gliricidia compost), K1 (5 t ha^-1cow manure-Gliricidia compost), K2 (10 t ha^-1cow manure-Gliricidia compost), K3 (15 t ha^-1cow manure-Gliricidia compost), and K4 (20 t ha^-1cow manure-Gliricidia compost). The results showed that the 15 t ha^-1 cow manure-Gliricidia compost was the best dose in improving the total pore space and penetration resistance of the soil studied. The application of 15 t ha^-1cow manure-Gliricidia compost significantly increased soybean yield, reaching 2.97 t ha^-1.</p>

Land clearing for oil palm plantations using heavy equipment will affect the physical properties of the soil, namely increasing soil compaction and decreasing soil porosity and soil moisture content. However, along with the growth of plantation crops such as oil palm, it is suspected that it can restore the physical properties of the soil. The aim of the study was to examine the differences in the physical characteristics of the soil at various ages of oil palm and the slope. The study was conducted in one of the oil palm plantations, Simpang Tuan Village, Mendahara Ulu District, Tanjung Jabung Timur Regency from March to May 2021. The study was carried out using the survey method, selecting representative areas using the Purposive Random Sampling method on oil palm plantation areas with various ages (newly planted, 5 years old, and 12 years old) and various marbles (0-3%, 3-8%, and 8-15%) with 3 replications. Parameters observed were soil texture, soil organic matter content, bulk density, water content, and soil permeability. The results showed that the older the age of oil palm plantations, the increase in organic matter content, total pore space, water content and soil permeability and a decrease in volume weight. The steeper the slope, the greater the weight of the soil volume and a decrease in the organic matter content, total pore space, water content and soil permeability.

Limbah tanaman sawit hasil pembongkaran siklus tanam pertama sebagai sumber bahan baku biochar tersedia dalam jumlah banyak pada lahan perkebunan kelapa sawit yang akan di replanting. Ketidaktahuan petani yang terhimpun Kelompok Tani Makmur Desa Damai Kecamatan Renah Mandaluh Kabupaten Tanjung Jabung Barat dalam mengelola dan memanfaatkan limbah tanaman sawit menyebabkan bahan tersebut terbuang begitu saja di lapangan. Biochar merupakan amelioran yang dapat memperbaiki kesuburan tanah dari lahan yang digunakan untuk budidaya tanaman sawit terutama siklus tanam kedua. Tujuan dari program pengabdian kepada masyarakat ini adalah memberdayakan Kelompok Tani Makmur dalam mengelola sumber karbon organik in situ menjadi biochar untuk memperbaiki dan meningkatkan kualitas kesuburan tanah lahan pertanian secara berkelanjutan. Program pengabdian dilaksanakan melalui metode penyuluhan, bimbingan teknis pembuatan biochar, dan bimbingan pengaplikasian biochar pada lahan pertanaman siklus kedua atau replanting tanaman kelapa sawit. Hasil yang dicapai dari program pengabdian adalah petani mengakui mendapat pengetahuan baru tentang biochar dan pemanfaatan residu tanaman kelapa sawit hasil pembongkaran siklus penanaman pertama sebagai bahan baku biochar dan pemanfaatnya untuk meningkat kesuburan tanah lahan perkebunan kelapa sawit. Petani mengetahui teknologi dan dapat membuat biochar dengan teknologi yang sudah diperkenalkan.