The use of liquid organic fertilizer (POC) is an innovative solution to increase crop productivity in drylands that face challenges in soil fertility and water availability. This study aims to evaluate the effect of various types of POC, including moringa, kirinyu, rabbit urine, fermented fruit waste, and local microorganism-based (MOL) POC, on plant growth and yield. The method used was literature review and analysis of literature from various journals, theses, theses, and dissertations, which were analyzed descriptively and quantitatively.  The results showed that all types of POC increased plant productivity with an average increase of 20-40% compared to the control, with rabbit urine recording the highest increase of 40%. The effectiveness of POC comes from the content of nutrients, bioactive compounds, and microorganisms that improve soil structure, increase water retention, and spur nutrient absorption. The discussion underscored the importance of utilizing local resources to reduce environmental pollution and improve agricultural sustainability.  In conclusion, POC proved to be an effective alternative to increase crop yields in drylands while supporting sustainable agriculture. Recommendations for further research include further exploration of local organic materials and application of POC on a field scale.

This research aims to explore the optimization of land clearing techniques in supporting agricultural sustainability in Dahana Tabaloho Village, Gunungsitoli District, North Sumatra. This research involved students of the University of Nias Agrotechnology Study Program who applied land clearing techniques which included weed removal, soil loosening, drainage and bed making. The methods used in this study were direct observation, interviews, and measurement of soil parameters before and after the application of the techniques. The results showed that the combination of traditional and modern techniques in land management can improve tillage efficiency and environmental sustainability. The use of cultivators for soil loosening is proven to speed up the process, but still requires organic fertilizer to maintain the quality of the soil structure. Good drainage is effective in managing excess water and ensuring water availability during the dry season. In addition, making beds with proper direction supports optimal plant growth. The 15% increase in organic matter content and the stability of soil pH to remain neutral are indicators of the success of the applied techniques. Overall, this study provides evidence that proper land management can support sustainable agricultural productivity in the tropics.

This research aims to explore the role of soil microorganisms in improving soil fertility and agricultural productivity to support sustainable agriculture. Using the literature review method, various scientific literatures were analyzed to identify the potential, challenges, and optimization strategies of microorganism technology. Microorganisms such as Nitrobacter, Streptomyces sp. and Trichoderma sp. play significant roles in nitrogen cycling, organic matter decomposition and plant pathogen control. In addition to naturally improving soil nutrition, these microorganisms also support agricultural efficiency by reducing dependence on synthetic chemical fertilizers and pesticides.  However, the adoption of this technology faces obstacles, such as farmers' lack of knowledge and limited access to quality products. Therefore, strategic steps are needed in the form of training programs, extension, and policy development to support the implementation of microorganism-based technologies. In the context of climate change, microorganisms also contribute to greenhouse gas mitigation and increase crop tolerance to abiotic stress. The results of this study emphasize the importance of microorganisms as a sustainable solution to the challenges of modern agriculture, as well as the need for collaboration between various parties to increase the capacity of farmers in implementing this technology. 
 

Soil fertility is a key element in the sustainability of agricultural systems that support global food security. One important soil microorganism that plays a role in improving soil fertility is Rhizobium, a bacterium capable of biological nitrogen fixation through a symbiotic relationship with leguminosae plants. This bacterium not only contributes to increasing soil nitrogen availability by 30-50% but also helps reduce dependence on synthetic nitrogen fertilizers, which has implications for reducing greenhouse gas emissions. Nonetheless, the effectiveness of Rhizobium is strongly influenced by environmental conditions such as pH, salinity, and chemical pollutants, which can inhibit its symbiotic ability. Technological innovations, such as nano-based formulations and the development of superior strains, offer solutions to improve the efficiency of Rhizobium, but challenges such as high costs and lack of policy support remain. In addition, the widespread use of Rhizobium inoculants may disrupt the balance of the soil microbial ecosystem, requiring further research. Therefore, integration of technology, policy and farmer education is needed to optimally utilize the full potential of Rhizobium while mitigating environmental risks, to support a more sustainable agricultural system.

The use of nitrogen-fixing bacteria in agriculture is an effective way to improve soil fertility and overall crop productivity. Bacteria such as Rhizobium, Azotobacter, and Azospirillum are able to extract nitrogen from the soil and convert it into a form that can be absorbed by plants, which is essential for the formation of protein, DNA, and RNA in plants. By utilizing the capabilities of these bacteria, the use of synthetic chemical fertilizers can be varied, thereby reducing the detrimental dampening effects on water quality and the environment. In addition, nitrogen-fixing bacteria improve water use efficiency and contribute to the health of aquatic ecosystems. The use of these bacteria has the potential to improve the results of a more thorough analysis with less cost and less environmental impact.

Soil fertility is an important element in agricultural sustainability, especially in supporting plant growth. One natural way to increase soil fertility is through Biological Nitrogen Fixation (FNB) by Rhizobium bacteria. These bacteria have a symbiotic relationship with legume plants, forming root nodules that convert atmospheric nitrogen into compounds that plants can absorb, such as ammonium (NH4+). The purpose of this article study is to determine the potential of Rhizobium bacteria in increasing and efficiency of nitrogen fixation which has an impact on soil fertility and increasing plant productivity. This study adopts a library research method or approach, which involves a series of systematic activities, starting from collecting data through various library sources, reading in depth, recording important information, to processing the research materials. The study results show that Rhizobium can reduce dependence on chemical fertilizers, increase soil fertility, and produce growth hormones that support nutrient absorption. These findings emphasize the important role of Rhizobium in supporting sustainable agriculture, especially in tropical regions where access to synthetic fertilizers is minimal.

Crop productivity is one of the key components in supporting the sustainability of the agricultural sector and global food security. However, challenges such as soil degradation, dependence on chemical fertilizers, and climate change necessitate more innovative and environmentally friendly approaches. Soil microorganisms play a significant role in improving crop productivity through biological mechanisms such as nitrogen fixation, organic matter decomposition, mycorrhizal symbiosis, and the production of bioactive compounds that protect plants from pathogens and abiotic stress. Microbiology-based biotechnology approaches, such as the use of biofertilizers and biopesticides, offer environmentally friendly solutions to address modern agricultural problems. This research aims to review the role of microorganisms in improving crop productivity, focusing on the application of microbiology-based biotechnology. The research method used is a literature study or meta-analysis of relevant literature and research in the last 10 years. The results of the discussion show that microorganisms such as Rhizobium, Azospirillum, Trichoderma, and mycorrhiza have a major contribution in improving soil fertility, crop yields, and plant resistance to environmental stress.

Organic farming has increasingly become a preferred choice in sustainable agricultural systems due to its significant benefits for environmental balance and quality. One of the key elements in organic farming is soil microorganisms, which play a crucial role in enhancing soil fertility and supporting plant health. Soil microorganisms, such as nitrogen-fixing bacteria, phosphate-solubilizing microbes, mycorrhiza, and organic matter decomposers, contribute significantly to fertilization efficiency and nutrient availability, as well as improving plant resistance to pathogens. The utilization of soil microorganisms as biofertilizers can reduce dependency on chemical fertilizers, mitigate environmental pollution, and increase agricultural productivity sustainably. Furthermore, soil microorganisms can improve soil structure, extend root longevity, and stimulate plant growth. The selection of appropriate microorganisms according to soil conditions and intended use is essential to maximize their benefits. Therefore, the application of soil fertility-promoting microorganisms as part of sustainable agricultural technology holds great potential to enhance environmentally friendly and efficient agricultural outcomes.

The use of fertilizer in plant cultivation is basically carried out to meet the availability of nutrients for plants in order to obtain optimal results. However, excessive use of fertilizer can actually have a negative impact on the ecosystem, such as environmental pollution and decreasing soil quality. The use of biofertilizer as a substitute for biological fertilizer is an alternative that can be used to reduce dependence on chemical fertilizers. Biofertilizer is a biological fertilizer containing various live microorganisms which is used to increase plant productivity by improving the quality of soil fertility. One of the microbes that acts as a biofertilizer is the Bacillus sp. The purpose of this article is to find out how Bacillus sp. functions as a biological fertilizer that can increase soil fertility and increase crop productivity. Bacillus is a genus of bacteria that can be used as a biofertilizer because of its more varied antagonistic mechanisms and ability to produce endospores. The method used in this article is a meta-analysis or literature review method in several journals published online which are integrated with Google Scholar.

Microorganisms are highly beneficial in sustainable agriculture as they are key components of the soil ecosystem and participate in various processes that enhance soil fertility, improve crop quality, and reduce reliance on synthetic chemicals. This study employs a meta-analysis or literature review method to examine previous research on the role of microorganisms in agriculture, specifically on how microorganisms play a critical role in sustainable farming. Most available studies rely on qualitative data or case studies, limiting the ability to conduct more in-depth quantitative analysis. The results indicate that waste processing into organic compost fertilizer is crucial. Applying organic farming methods improves crop quality while maintaining ecosystem balance.