This research aimed to determine the effectiveness of several types of liquid organic fertilizer (LOF) derived from plant waste and the dose of P fertilizer on the growth and yield of upland rice on degraded acid soil. The treatments consisted of two factors. The first factor (A) was several types of LOF consisting of A1 (control), A2 (LOF containing isolates of P-solubilizing bacteria), A3 (LOF-banana waste), and A4 (A2+A3). The second factor (B) was fertilizer doses consisting of B1 (50% of the recommended dose of P fertilizer), B2 (75% of the recommended dose of P fertilizer), and B3 (100% of the recommended dose of P fertilizer). The treatment combinations were arranged in a factorial randomized block design with three replications. The research results showed that applying either LOF-banana waste or the mixture of LOF-banana waste and LOF-containing isolates of P-solubilizing bacteria improved plant height, the number of tillers, and N and P uptake by the plant. The rice grain yields among the treatments were not significantly different, but the highest rice grain yield (139.8 g/pot) was obtained at the treatment of the mixture of LOF-P isolate + LOF-banana waste (A2+A3 treatments). The 75% of the recommended dose of P fertilizer was not significantly different from 100% P fertilizer with LOF on growth and yield upland rice and nutrient uptake by the plant.

Barus J, Meithasari D, Lumbanraja J, Sudarsono H, Hidayat KF, Dermiyati. 2021. Soil mesofauna amount and diversity by returning fresh and compost of crops biomass waste in ultisols in-situ. Biodiversitas 21: 92-98. Newly added organic matter to the soil often has no significant effect on the physical and chemical properties of the soil. However, the addition of organic matter greatly affects the abundance and diversity of living organisms in the soil, because the addition of organic matter is one of the sources of food. The aim of this research was to study the impact of returning crop biomass waste in fresh or compost forms on the abundance and diversity of soil mesofauna. Three types of crop biomass residues (i.e. maize stover, rice straw, and soybean stover) were used at doses of 0, 2.5, 5.0, 7.5, and 10 t ha-1. Mesofauna observations were carried out three times, namely at two weeks after biomass waste application (before planting rice), at eight weeks (there were rice plants in the soil), and at fourteen weeks (after rice harvest). The soil sample for mesofauna observation was dry extracted using a Berlese funnel set up, and to calculate and identified using a binocular microscope. The result showed that the number and diversity of mesofauna in the addition of compost was higher than that of fresh biomass waste. Increasing the dose of biomass waste has an effect on increasing the number and diversity of soil mesofauna. The presence of rice plants in the soil at the time of observation also affected the abundance of soil mesofauna.

Purpose: This paper reviews the research results on sorghum plants that use organic fertilizer to increase production. Theoretical reference: Sorghum plants also need to be fertilized to increase productivity. The use of chemical fertilizers in plants will have a broad impact on the environment and human health, so it is necessary to have an alternative organic fertilizer that is safe and leads to environmentally friendly agriculture, in addition to being a source of nutrients and to improve the properties of infertile soil. Methods: This research is supported and studied with a descriptive qualitative method. All information is collected through document analysis. The literature taken is the most recent year (the last 10 years). The productivity resulting from applying organic fertilizers is compared to the productivity without applying organic fertilizers. Then see the increase in results. In addition to productivity, the results of research on the quality of sorghum seeds are also seen. Results: According to various research results, applying organic fertilizers increases productivity ranging from 5.66% to 71.28% with an average of 20.96% compared to without organic fertilizers. Conclusions: Indonesia is one of the countries with the potential for the development of sorghum which can be done by environmentally friendly cultivation and the use of organic fertilizers because it is proven to increase productivity and improve the quality of sorghum seeds. Sorghum (Sorghum bicolor (L.) Moench) planting can sustainably meet more food needs because sorghum plants have a higher protein content than corn and rice plants.

Organic farming has been advocated as a more environmentally sound and ecologically balanced alternative to the dominant agricultural model. This study compared the decomposition of plant biomass in organically and non-organically managed soil properties. The treatments consisted of non-organic land (A) and organic land (B). Non-organic land used chemical fertilizers as the main fertilizer, and organic fertilizers were not always given. In organic land, all fertilizers given were organic fertilizers, and organic pesticides have been carried out over the last five years. The area of ??each land studied was approximately 1,000 m2 divided into five points diagonally. Observations were made on soil pH, organic C, total N, and P Bray, as well as the amount and weight of soil macrofauna. The decomposition rate of the dried Edamame soybean biomass in the soil was estimated using the litterbag method. A litterbag measuring 30 x 20 cm with a pore size of 2-3 mm was used for this study. Seventy grams of plant biomass were put into the litterbag and buried in the soil to a depth of 10-20 cm. Analysis of C and N contents in plant biomass was carried out before and after incubation in the soil. The results showed that soil chemical properties are better, and soil macrofauna is more abundant in organic than non-organic land. Soil fertility in organic land was characterized by a larger decomposition rate constant (k) and a faster decrease in C/N ratios. The decomposition rate constant (k) in organic soil was 0.171, and that in non-organic soil was 0.105.

This study aims to analyze the level of soil fertility, the condition of the physical properties of the soil, and the level of soil erodibility on coffee plantations with various slope levels. Observations were made on coffee plantations in two villages in Way Tenong District, West Lampung Regency, namely Fajar Bulan Village and Puralaksana Village, in April 2022. The number of sampling points in each village is 6 points. Composite soil samples were taken to analyze the chemical properties of the soil, including pH, C-Organic, N-Total, P content, and soil cation exchange capacity. Meanwhile, intact soil samples were used to determine the values of bulk density, soil porosity, soil texture, and soil moisture content. The analysis was carried out at the Laboratory of Institute for Agricultural Technology Assessment (BPTP) Lampung. Based on the soil pH levels at the sampling location, the soil reactions were acid with pH < 5, with only one location with a pH above 5 (FB 1). Soil organic matter content in most locations was still low, except for FB 1 location. The slope of the slopes at the soil sampling location varied from flat (0 - 10%) to mountainous (>60%). Based on physical properties, soil density is generally high (the highest BD is 1.59) and low porosity value. The coffee yields tend to decline from 2019-2021.

This study aimed to evaluate the ability of microbes from the rumen contents of cattle as antagonists of pathogenic fungi and as liquid organic fertilizer (LOF) containing P-solubilizing bacteria in rice plants. The mixture consisting of 5 kg rumen contents of cattle, 2 kg of rice bran, 1 kg of molasses, and 10 L of tap water was fermented for 14 days. After fermentation, the mixture was filtered to separate the liquid from the solid components. The solid portion was collected for the isolation and screening of contained bacteria. Subsequent tests included biochemical tests, antagonistic activity tests, DNA extraction, PCR amplification, phosphate solubilization ability testing, inhibitory ability study, and application of LOF in a screen house. One bacterial isolate (PTK2TB code) exhibited the highest antagonistic activity against three tested pathogenic fungi (inhibits more than 50%). Subsequent 16SrDNA sequence analysis showed that this isolate belongs to the same group as the type strain and reference strain of Bacillus amyloliquefaciens. Furthermore, out of the 90 bacterial isolates obtained, 20 demonstrated a high capacity for phosphate solubilization. Additionally, LOF containing phosphate-solubilizing bacterial isolates positively impacted rice growth and yield.