Agricultural biostimulants are a group of substances or microorganisms, based on natural resources, that are applied to plants or soils to improve nutrient uptake and plant growth, and provide better tolerance to various stresses. Their function is to stimulate the natural processes of plants, or to enrich the soil microbiome to improve plant growth, nutrition, abiotic and/or biotic stress tolerance, yield and quality of crop plants. Interest in plant biostimulants has been on the rise over the past 10 years, driven by the growing interest of researchers and farmers in environmentally-friendly tools for improved crop performance. Improved crop production technologies are urgently needed to meet the growing demand for food for the ever-increasing global population by addressing the impacts of changing climate on agriculture. This book is of interest to researchers in agriculture, agronomy, crop and plant science, soil science and environmental science.

Over the past decade, interest in plant biostimulants has been on the rise, compelled by the growing interest of researchers, extension specialists, private industries, and farmers in integrating these products in the array of environmentally friendly tools to secure improved crop performance, nutrient efficiency, product quality, and yield stability. Plant biostimulants include diverse organic and inorganic substances, natural compounds, and/or beneficial microorganisms such as humic acids, protein hydrolysates, seaweed and plant extracts, silicon, endophytic fungi like mycorrhizal fungi, and plant growth-promoting rhizobacteria belonging to the genera Azospirillum, Azotobacter, and Rhizobium. Other substances (e.g., chitosan and other biopolymers and inorganic compounds) can have biostimulant properties, but their classification within the group of biostimulants is still under consideration. Plant biostimulants are usually applied to high-value crops, mainly greenhouse crops, fruit trees and vines, open-field crops, flowers, and ornamentals to sustainably increase yield and product quality. The global biostimulant market is currently estimated at about $2.0 billion and is expected to reach $3.0 billion by 2021 at an annual growth rate of 13%. A growing interest in plant biostimulants from industries and scientists was demonstrated by the high number of published peer-reviewed articles, conferences, workshops, and symposia in the past ten years. This book compiles several original research articles, technology reports, methods, opinions, perspectives, and invited reviews and mini reviews dissecting the biostimulatory action of these natural compounds and substances and beneficial microorganisms on crops grown under optimal and suboptimal growing conditions (e.g., salinity, drought, nutrient deficiency and toxicity, heavy metal contaminations, waterlogging, and adverse soil pH conditions). Also included are contributions dealing with the effect as well as the molecular and physiological mechanisms of plant biostimulants on nutrient efficiency, product quality, and modulation of the microbial population both quantitatively and qualitatively. In addition, identification and understanding of the optimal method, time, rate of application and phenological stage for improving plant performance and resilience to stress as well as the best combinations of plant species/cultivar × environment × management practices are also reported. We strongly believe that high standard reflected in this compilation on the principles and practices of plant biostimulants will foster knowledge transfer among scientific communities, industries, and agronomists, and will enable a better understanding of the mode of action and application procedures of biostimulants in different cropping systems.

Biostimulants are synthetic or natural substances that can be used in soil, seeds and plants, and which influence tolerance towards abiotic stress, uptake of nutrients and nutrient efficiency. Seaweed extracts, helpful fungi and bacteria, humic acids, and liquid manure composting are some of the several types of biostimulants. They are increasingly being used in sustainable agricultural practices. These practices strive to strike a balance between the need to produce food and preserving the ecological system. The three primary goals of sustainable agriculture are maintaining environmental health, ensuring economic profitability, and guaranteeing social and economic equity. Biostimulants are compatible with the most progressive farming practices utilized in integrated crop management. They act as soil conditioners and assist the plants in securing nutrients, increasing crop productivity, and repelling pests. This book aims to shed light on the use of biostimulants in sustainable agriculture and crop production. It presents researches and studies performed by experts across the globe. This book will prove immensely beneficial to professionals and students involved in this area of agriculture science.

Biostimulants stimulate natural processes in crops to enhance nutrient uptake, nutrient use efficiency (NUE), resistance to abiotic stress and quality traits. This collection reviews key advances in understanding and using biostimulants.

Today, the agriculture industry is confronted with simultaneous issues of how to fully embrace mass production of safer food in terms of both quality and quantity. Most industries are concerned with avoiding significant levels of soil pollution and environmental threats as a result of the excessive and harmful use of synthetic products on crops. Therefore, there is a need to adopt sustainable technological innovations that can ensure the sustainability of agricultural production systems. Microbial Biostimulants for Sustainable Agriculture and Environmental Bioremediation discusses the benefits, challenges, and practical applications of eco-friendly biotechnological techniques using biostimulants derived from beneficial microorganisms. The chapters cover the use of these organisms to increase crop production, enhance soil fertility and maintain soil health, create crop and plant tolerance to different abiotic stressors, release required nutrients to the soil, increase resistance to plant pathogens/pests, improve nutrient use efficiency of crops, and rejuvenate polluted environments. FEATURES Explores the physiological, morpho-anatomical, and biochemical molecular plant rejoinders involved in stimulating crop productivity Provides information on the physiological, cellular, and molecular modes of action underlying microbial biostimulant interfaces Summarizes methods and approaches for executing microbial stimulant technology Outlines numerous environmental management and remediation strategies This book is an ideal resource for researchers, engineers, and academics working in soil science, crop science, water remediation, microbiology, and biotechnology.

Sustainable agriculture refers to a type of farming practice that addresses the needs of present and future generations, while ensuring profitability, environmental health, and social and economic equity. It incorporates a wide range of eco-friendly methods of farming that allow the production of crops or livestock without causing any damage to human or natural systems. Some of the common sustainable agriculture practices include multiple cropping, permaculture, mixed farming, agroforestry, crop rotation, and use of plant biostimulants. In agriculture, biostimulant refers to any substance or a mixture of substances having natural or microbial origin, which helps to improve the condition of crops. The use of biostimulants has shown to stimulate germination, seeding, plant growth, and crop productivity. This book provides comprehensive insights on sustainable agriculture and the application of microorganisms as biostimulants. A number of latest researches have been included to keep the readers updated with the global concepts in this area of study. Students, researchers, experts, and all interested in sustainable agriculture will benefit alike from this book.

This edited book is a comprehensive compilation highlighting sources of biostimulants, their production, influence on plant growth and development, and regulatory status of plant biostimulants for better understanding and opening new vistas for future research. Biostimulants, the biological formulations are known to meliorate the plants growth and vigour, improve nutritional efficiency along with maintaining their well-being mainly via providing protection against a wide range of infections. Both horticultural as well as agricultural crops involve the utilization of the biostimulants. Fulvic and humic acids, nitrogen-containing compounds, protein hydrolysates, favourable bacteria and fungi, and extracts of seaweed are the chief active components of these. The major driving force for these materials is the organic farming industry and demand for sustainable crop production. This book will be of great interest to researchers, teachers, climate change scientists, capacity builders, and policy makers. Moreover, this book does the work of a supplementary reading for students in various fields such as agriculture, soil science, ecology, environmental science and forestry at undergraduate as well as graduate level. This will be a gainful read for national and international agricultural scientists and the policy makers. • Elaborates on biostimulants induced influence of plant growth and development • Covers all aspects of biostimulants sources and its role in plant life in detail • Discusses evidence based approach in biostimulants sources and its useful applications in plants

Microbial biotechnology is an emerging field with applications in a broad range of sectors involving food security, human nutrition, plant protection and overall basic research in the agricultural sciences. The environment has been sustaining the burden of mankind from time immemorial, and our indiscriminate use of its resources has led to the degradation of the climate, loss of soil fertility, and the need for sustainable strategies. The major focus in the coming decades will be on achieving a green and clean environment by utilizing soil and plant-associated beneficial microbial communities. Plant-microbe interactions include the association of microbes with plant systems: epiphytic, endophytic and rhizospheric. The microbes associated with plant ecosystems play an important role in plant growth, development, and soil health. Moreover, soil and plant microbiomes help to promote plant growth, either directly or indirectly by means of plant growth-promoting mechanisms, e.g. the release of plant growth regulators; solubilization of phosphorus, potassium and zinc; biological nitrogen fixation; or by producing siderophores, ammonia, HCN and other secondary metabolites. These beneficial microbial communities represent a novel and promising solution for agro-environmental sustainability by providing biofertilizers, bioprotectants, and biostimulants, in addition to mitigating various types of abiotic stress in plants. This book focuses on plant-microbe interactions; the biodiversity of soil and plant microbiomes; and their role in plant growth and soil health. Accordingly, it will be immensely useful to readers working in the biological sciences, especially microbiologists, biochemists and microbial biotechnologists.

This book provides a comprehensive overview of the benefits of biofertilizers as an alternative to chemical fertilizers and pesticides. Agricultural production has increased massively over the last century due to increased use of chemical fertilizers and pesticides, but these gains have come at a price. The chemicals are not only expensive; they also reduce microbial activity in agricultural soils and accumulate in the food chain, with potentially harmful effects for humans. Accordingly, it is high time to explore alternatives and to find solutions to overcome our increasing dependence on these chemicals. Biofertilizers, which consist of plant remains, organic matter and microorganisms, might offer an alternative. They are natural, organic, biodegradable, eco-friendly and cost-effective. Further, the microbes present in the biofertilizers are important, because they produce nutrients required for plant growth (e.g., nitrogen, phosphorus, potassium), as well as substances essential for plant growth and development (e.g., auxins and cytokinins). Biofertilizers also improve the physical properties, fertility and productivity of soil, reducing the need for chemical fertilizers while maintaining high crop yield. This makes biofertilizers a powerful tool for sustainable agriculture and a sustainable environment. The book covers the latest research on biofertilizers, ranging from beneficial fungal, bacterial and algal inoculants; to microbes for bioremediation, wastewater treatment; and recycling of biodegradable municipal, agricultural and industrial waste; as well as biocontrol agents and bio-pesticides. As such, it offers a valuable resource for researchers, academics and students in the broad fields of microbiology and agriculture.