Harmful cyanobacterial blooms (HABs), primarily composed of toxic cyanobacteria like Microcystis aeruginosa, pose a significant threat to aquatic ecosystems and human health. Algicidal bacteria had emerged as a promising strategy for HAB control due to their safety and efficacy. In this study, the algicidal bacterium Streptomyces violaceorubidus lzh-14, isolated from Cha Lake in Dezhou, China, exhibited strong algicidal activity against M. aeruginosa. When bacterial culture was added to algal cultures at a final volume ratio of 10% (v/v), the algicidal activity reached 94.5% ± 1.8% after 72 h. Moreover, S. violaceorubidus lzh-14 showed varying degrees of algicidal activity against other tested cyanobacterial species. Microscopic observation revealed that M. aeruginosa cells treated with lzh-14 became deformed and ruptured, resulting in the leakage of cellular contents. The algicidal substance extracted from S. violaceorubidus lzh-14 demonstrated strong stability under varying temperatures and pH conditions. Based on these findings, algicidal powder was preliminarily developed. This study confirms that S. violaceorubidus lzh-14 and its active substance have potential as effective biocontrol agents against HABs.

Phosphorus (P) is an essential macronutrient required for optimal plant growth, yet its limited bioavailability in soil often restricts crop growth and yie

Intensive poultry farming produces substantial volumes of chicken manure that require effective and hygienic management. This study investigated a composite inoculant formulated with four microorganisms: Kocuria rosea ACCC 10488, Bacillus subtilis ACCC 60364, Trichoderma longibrachiatum ACCC 32584, and Lactobacillus plantarum ACCC 11118. This study investigated a composite inoculant formulated with four microorganisms obtained from the Agricultural Culture Collection of China (ACCC): Kocuria rosea ACCC 10488, Bacillus subtilis ACCC 60364, Trichoderma longibrachiatum ACCC 32584, and Lactobacillus plantarum ACCC 11118. Its performance was examined both without amendment and after addition of plant-derived bulking materials. The experiment included five treatments: untreated chicken manure (T1), the bulking-agent mixture without microbial addition (T2), a commercial inoculant combined with the same bulking materials (T3), the newly prepared inoculant without bulking agents (T4), and the newly prepared inoculant combined with the bulking mixture (T5). Three independent 50-kg piles were prepared for every treatment. Temperature was recorded for 45 days; physicochemical characteristics, odor indicators, nutrient concentrations, enzyme activities, seed-bioassay responses, and Ascaris egg mortality were evaluated over the initial 15 days. T5 reached 74 °C on days 5 and 10 and remained above 50 °C through day 30 at the plotted observation points. On day 15, this treatment had lower measured levels of odorous compounds, greater concentrations of available phosphorus and potassium, a 99% germination index, and complete mortality of the assayed Ascaris eggs. Collectively, T5 showed favorable changes across several indicators of early composting performance under the conditions tested. The study did not examine microbial community structure, persistence of the introduced strains, functional genes, whole-pile nutrient mass balances, or longer-term agronomic performance. Consequently, the data neither establish synergistic interactions among the component strains nor identify specific nutrient-transformation pathways.