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The concept of nitrogen gap (NG), i.e., its recognition and amelioration, forms the core of this book entitled Site-Specific Nutrient Management (SSNM). Determination of the presence of an NG between fields on a farm and/or within a particular field, together with its size, requires a set of highly reliable diagnostic tools. The necessary set of diagnostic tools, based classically on pedological and agrochemical methods, should be currently supported by remote-sensing methods. A combination of these two groups of methods is the only way to recognize the factors responsible for yield gap (YG) appearance and to offer a choice of measures for its effective amelioration. The NG concept is discussed in the two first papers (Grzebisz and Łukowiak, Agronomy 2021, 11, 419; Łukowiak et al., Agronomy 2020, 10, 1959). Crop productivity depends on a synchronization of plant demand for nitrogen and its supply from soil resources during the growing season. The action of nitrate nitrogen (N–NO3), resulting in direct plant crop response, can be treated by farmers as a crucial growth factor. The expected outcome also depends on the status of soil fertility factors, including pools of available nutrients and the activity of microorganisms. Three papers are devoted to these basic aspects of soil fertility management (Sulewska et al., Agronomy 2020, 10, 1958; Grzebisz et al., Agronomy 2020, 10, 1701; Hlisnikovsky et al., Agronomy 2021, 11, 1333). The resistance of a currently cultivated crop to seasonal weather variability depends to a great extent on the soil fertility level. This aspect is thoroughly discussed for three distinct soil types and climates with respect to their impact on yield (Hlisnikovsky et al., Agronomy 2020, 10, 1160—Czech Republic; Wang et al., Agronomy 2020, 10, 1237—China; Łukowiak and Grzebisz et al., Agronomy 2020, 10, 1364—Poland). In the fourth section of this book, the division a particular field into homogenous production zones is discussed as a basis for effective nitrogen management within the field. This topic is presented for different regions and crops (China, Poland, and the USA) (Cammarano et al., Agronomy 2020, 10, 1767; Panek et al., Agronomy 2020, 10, 1842; Larson et al., Agronomy 2020, 10, 1858).

Research & information: general --- Biology, life sciences --- Technology, engineering, agriculture --- Triticum aestivum L. --- farmyard manure --- mineral fertilizers --- crude protein content --- soil properties, site-specific requirements --- yield --- site-specific nitrogen management --- regional optimal nitrogen management --- net return --- nitrogen use efficiency --- spatial variability --- temporal variability --- seed density --- N uptake --- indices of N productivity --- mineral N --- indigenous Nmin at spring --- post-harvest Nmin --- N balance --- N efficiency --- maximum photochemical efficiency of photosystem II --- chlorophyll content index --- soil enzymatic activity --- biological index fertility --- nitrogenase activity --- microelements fertilization (Ti --- Si --- B --- Mo --- Zn) --- soil --- nitrate nitrogen content --- contents of available phosphorus --- potassium --- magnesium --- calcium --- cardinal stages of WOSR growth --- PCA --- site-specific nutrient management --- soil brightness --- satellite remote sensing --- crop yield --- soil fertility --- winter wheat --- winter triticale --- vegetation indices --- NDVI --- grain yield --- number of spikes --- economics --- normalized difference vegetation index (NDVI) --- on-the-go sensors --- winter oilseed rape → winter triticale cropping sequence --- N input --- N total uptake --- N gap --- Beta vulgaris L. --- organic manure --- weather conditions --- soil chemistry --- sugar concentration --- climatic potential yield --- yield gap --- soil constraints --- subsoil --- remote sensing-techniques --- field --- a field --- crop production --- sustainability --- homogenous productivity units --- nitrogen indicators: in-season --- spatial --- vertical variability of N demand and supply --- spectral imagery

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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.

Research & information: general --- Biology, life sciences --- Technology, engineering, agriculture --- Crocus sativus L. --- biofertilization --- arbuscular mycorrhizal fungi --- antioxidant activity --- crocin --- picrocrocin --- polyphenols --- safranal --- Maize --- biostimulant --- root --- stress --- growth --- gene expression --- stem cuttings --- propagation --- root morphology traits --- indole-3-acetic acid (IAA) --- indole-3-butyric acid (IBA) --- gibberellins --- phenolic compounds --- nutrients --- nutraceutical potential --- soybean --- yield --- N organic fertilizer --- seaweed extract --- mycorrhizal inoculants --- phosphate-solubilizing microorganisms --- biofertilizers --- microorganism consortium --- biostimulants --- Crocus sativus --- Funneliformis mosseae --- glasshouse --- protected cultivation --- Rhizophagus intraradices --- substrate --- L-methionine --- L-tryptophan --- L-glycine --- lettuce --- nitrogen --- plant biostimulant --- environmental stress --- vegetables --- fruit quality --- plants biostimulants --- yielding --- Biostimulants --- Euglena gracilis --- algal polysaccharide --- β-glucan --- water stress --- tomato --- aeroponics --- Zea mays L --- lignohumate --- lignosulfonate --- biological activity --- nitrogen metabolism --- carbon metabolism --- proteins --- phenolics --- sugars --- Ascophyllum nodosum --- Solanum melongena --- heterostyly --- pollination efficiency --- soilless conditions --- abiotic stress --- alfalfa hydrolysate --- chitosan --- zinc --- ascorbic acid --- Fragaria x ananassa --- functional quality --- lycopene --- organic farming --- protein hydrolysate --- Solanum lycopersicum L. --- tropical plant extract --- fertilizer --- melatonin --- phytomelatonin --- plant protector --- plant stress --- Lactuca sativa L. --- legume-derived protein hydrolysate --- nitrate --- Septoria --- wheat --- Paraburkholderia phytofirmans --- thyme essential oil --- isotope --- phytoparasitic nematodes --- suppressiveness --- sustainable management --- anti-nutritional substances --- fat --- fibre --- morphotype --- protein --- corn --- imaging --- industrial crops --- maize --- next generation sequencing --- phenomics --- plant phenotyping --- row crops --- Bacillus subtilis --- carotenoids --- probiotics --- PGPR --- Mentha longifolia --- humic acid --- antioxidants --- arbuscular mycorrhizal symbiosis --- mycorrhizosphere --- AMF associated bacteria --- plant growth-promoting bacteria --- phosphate-solubilizing bacteria --- siderophore production --- soil enzymatic activity --- biological index fertility --- nitrogenase activity --- microelements fertilization (Ti, Si, B, Mo, Zn) --- seed coating --- cover crop --- vermicompost --- growth enhancement --- AM fungi --- PGPB --- water deficit --- common bean --- Glomus spp. --- organic acids --- pod quality --- seaweed extracts --- seed quality --- tocopherols --- total sugars --- bean --- amino acids --- phenols --- flavonoids --- microbial biostimulant --- non-microbial biostimulant --- Lactuca sativa L. var. longifolia --- mineral profile --- physiological mechanism --- photosynthesis --- biocontrol --- plant growth promotion --- soil inoculant --- Trichoderma --- Azotobacter --- Streptomyces --- deproteinized leaf juice --- fermentation --- lactic acid bacteria --- plant nutrition --- antioxidant capacity --- ornamental plants --- N fertilization --- nitrogen use efficiency --- leaf quality --- Spinacia oleracea L. --- sustainable agriculture --- Valerianella locusta L. --- isotopic labeling --- turfgrass --- humic acids --- leaf area index (LAI) --- specific leaf area (SLA) --- Soil Plant Analysis Development (SPAD) index --- tuber yield --- ultrasound-assisted water --- foliar spray --- Pterocladia capillacea --- bio-fertilizer --- growth parameters --- Jew’s Mallow --- CROPWAT model --- eco-friendly practices --- total ascorbic acid --- Mater-Bi® --- mineral composition --- SPAD index --- Bacillus thuringiensis --- Capsicum annuum --- microbiome --- strain-specific primer --- tracking --- sweet basil --- alfalfa brown juice --- biostimulation --- chlorophyll pigments --- histological changes --- humic substances --- protein hydrolysates --- silicon --- arbuscular mycorrhiza --- plant growth promoting rhizobacteria --- macroalgae --- microalgae --- abiotic stresses --- nutrient use efficiency --- physiological mechanisms

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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.

Crocus sativus L. --- biofertilization --- arbuscular mycorrhizal fungi --- antioxidant activity --- crocin --- picrocrocin --- polyphenols --- safranal --- Maize --- biostimulant --- root --- stress --- growth --- gene expression --- stem cuttings --- propagation --- root morphology traits --- indole-3-acetic acid (IAA) --- indole-3-butyric acid (IBA) --- gibberellins --- phenolic compounds --- nutrients --- nutraceutical potential --- soybean --- yield --- N organic fertilizer --- seaweed extract --- mycorrhizal inoculants --- phosphate-solubilizing microorganisms --- biofertilizers --- microorganism consortium --- biostimulants --- Crocus sativus --- Funneliformis mosseae --- glasshouse --- protected cultivation --- Rhizophagus intraradices --- substrate --- L-methionine --- L-tryptophan --- L-glycine --- lettuce --- nitrogen --- plant biostimulant --- environmental stress --- vegetables --- fruit quality --- plants biostimulants --- yielding --- Biostimulants --- Euglena gracilis --- algal polysaccharide --- β-glucan --- water stress --- tomato --- aeroponics --- Zea mays L --- lignohumate --- lignosulfonate --- biological activity --- nitrogen metabolism --- carbon metabolism --- proteins --- phenolics --- sugars --- Ascophyllum nodosum --- Solanum melongena --- heterostyly --- pollination efficiency --- soilless conditions --- abiotic stress --- alfalfa hydrolysate --- chitosan --- zinc --- ascorbic acid --- Fragaria x ananassa --- functional quality --- lycopene --- organic farming --- protein hydrolysate --- Solanum lycopersicum L. --- tropical plant extract --- fertilizer --- melatonin --- phytomelatonin --- plant protector --- plant stress --- Lactuca sativa L. --- legume-derived protein hydrolysate --- nitrate --- Septoria --- wheat --- Paraburkholderia phytofirmans --- thyme essential oil --- isotope --- phytoparasitic nematodes --- suppressiveness --- sustainable management --- anti-nutritional substances --- fat --- fibre --- morphotype --- protein --- corn --- imaging --- industrial crops --- maize --- next generation sequencing --- phenomics --- plant phenotyping --- row crops --- Bacillus subtilis --- carotenoids --- probiotics --- PGPR --- Mentha longifolia --- humic acid --- antioxidants --- arbuscular mycorrhizal symbiosis --- mycorrhizosphere --- AMF associated bacteria --- plant growth-promoting bacteria --- phosphate-solubilizing bacteria --- siderophore production --- soil enzymatic activity --- biological index fertility --- nitrogenase activity --- microelements fertilization (Ti, Si, B, Mo, Zn) --- seed coating --- cover crop --- vermicompost --- growth enhancement --- AM fungi --- PGPB --- water deficit --- common bean --- Glomus spp. --- organic acids --- pod quality --- seaweed extracts --- seed quality --- tocopherols --- total sugars --- bean --- amino acids --- phenols --- flavonoids --- microbial biostimulant --- non-microbial biostimulant --- Lactuca sativa L. var. longifolia --- mineral profile --- physiological mechanism --- photosynthesis --- biocontrol --- plant growth promotion --- soil inoculant --- Trichoderma --- Azotobacter --- Streptomyces --- deproteinized leaf juice --- fermentation --- lactic acid bacteria --- plant nutrition --- antioxidant capacity --- ornamental plants --- N fertilization --- nitrogen use efficiency --- leaf quality --- Spinacia oleracea L. --- sustainable agriculture --- Valerianella locusta L. --- isotopic labeling --- turfgrass --- humic acids --- leaf area index (LAI) --- specific leaf area (SLA) --- Soil Plant Analysis Development (SPAD) index --- tuber yield --- ultrasound-assisted water --- foliar spray --- Pterocladia capillacea --- bio-fertilizer --- growth parameters --- Jew’s Mallow --- CROPWAT model --- eco-friendly practices --- total ascorbic acid --- Mater-Bi® --- mineral composition --- SPAD index --- Bacillus thuringiensis --- Capsicum annuum --- microbiome --- strain-specific primer --- tracking --- sweet basil --- alfalfa brown juice --- biostimulation --- chlorophyll pigments --- histological changes --- humic substances --- protein hydrolysates --- silicon --- arbuscular mycorrhiza --- plant growth promoting rhizobacteria --- macroalgae --- microalgae --- abiotic stresses --- nutrient use efficiency --- physiological mechanisms