chlorophyll a Articles
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Sensitivity of chlorophyll meters for diagnosing nitrogen deficiencies of corn in production agriculture
Chlorophyll meters have been widely used to diagnose N deficiencies in research trials and to help refine N fertilizer recommendations in production agriculture. The diagnoses are based on the assumption that chlorophyll meters can detect a wide range of N deficiencies under field conditions according to relationships between chlorophyll meter readings (CMRs) and yield responses to N ...
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Photosynthesis, chlorophyll fluorescence characteristics and chlorophyll content of soybean seedlings under combined stress of bisphenol A and cadmium
Bisphenol A (BPA) is ubiquitous in the environment due to its continual application in plastics and epoxy resin industry. Cadmium (Cd) is a highly toxic heavy metal element mainly used in smelting, electroplating and plastic/dye manufacturing. BPA and Cd pollution exist simultaneously in many agricultural regions. However, little information is available regarding the combined effects of BPA ...
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Enantioselective toxicity and degradation of the chiral insecticide fipronil in Scenedesmus obliguus suspension system
Fipronil is an effective insecticide, but it present high toxic effect to non‐target aquatic organisms. The enantioselective toxicity and degradation of fipronil enantiomers in the freshwater algae Scenedesmus obliguus suspension were studied in the present study. There was great difference in the acute toxicity of the enantiomers to Scenedesmus obliguus with 72 h median effective ...
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Controlled atmosphere storage for preservation of Salicornia ramosissima
Salicornia is a halophytic plant that grows near salt marshes and salted wetlands, very rich in vitamins, minerals and highly unsaturated oils. Because of its biochemical composition and despite salinity, Salicornia is considered a gourmet product. Since stems present a short shelf life, the aim of this work was to evaluate the effect of controlled atmosphere on quality of Salicornia ramosissima ...
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Differential effects of low humidity levels on butterhead quality indices related to external, middle and internal lettuce sections
Leaf water status evolution during greenhouse butterhead lettuce storage under adverse humidity conditions was evaluated. The relationships between water status and the chlorophyll content and overall visual quality (OVQ) were analysed. Parameters were evaluated in external, middle and internal sections of the lettuce heads. Indices showed different behaviour in different sections. There was a ...
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A comparison of three isolines of cotton differing in fiber color for yield, quality, and photosynthesis
Naturally colored cotton (Gossypium hirsutum L.) fibers (CCFs) are eco-friendly for the textile industry because they omit the dyeing process and reduce harmful effluent liquor. However, the low yield and quality of CCFs have greatly affected their development. Limited information is available on the reasons for the low yield and quality of CCFs. The aim of this 2-yr investigation was to compare ...
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Changes in chlorophyll, anthocyanins and phenolic compounds concentration in fresh–cut onion
The minimal processing of onion is practical and convenient to consumers, eliminating the inconvenience of peeling, cutting, unwanted odour and tearing effect. The study aimed to estimate the levels of chlorophyll, anthocyanins and phenolic compounds in fresh–cut onions, triturated in the form. Onions, white and purple, obtained in Pombal–PB were conducted in the Laboratory of Food ...
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Nickel effects on productivity of algal periphyton communities
In order to evaluate the long-term (30-day) influence of nickel on biomass of periphyton communities, indoor artificial streams were used with differing nickel concentration (2.5, 5, and 7.5 mg/l). Physical and chemical factors (pH, NO3-N, PO4-P, dissolved oxygen, total suspended solids, conductivity, total dissolved solids, biochemical oxygen demand, and chemical oxygen demand) were measured ...
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Corn response to competition: growth alteration vs. yield limiting factors
Competition mechanisms among adjacent plants are not well understood. This study compared corn growth and yield responses to water, N, and shade at 74,500 plants ha–1 (1x) with responses to water and N when planted at 149,000 plant ha–1. Plant biomass, leaf area, chlorophyll content, reflectance, and enzyme expression (transcriptome analysis) were measured at V-12. Grain and stover yields were ...
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Strategies to make use of plant sensors-based diagnostic information for nitrogen recommendations
Improvements of nitrogen use efficiency (NUE) may be achieved through the use of sensing tools for N status determination. Leaf and canopy chlorophyll, as well as leaf polyphenolics concentrations, are characteristics strongly affected by N availability that are often used as a surrogate to direct plant N status estimation. Approaches with near-term operational sensors, handheld and ...
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Nutrient loads and their impacts on chlorophyll
a in the Mae Klong River and estuarine ecosystem: an approach for nutrient criteria developmentInvestigations on the water quality of the Mae Klong River and Estuary were conducted from April 2005 to February 2006 during periods of early-, mid-, and late-loading. Nutrient loads and transfer patterns were studied together with clarification of contaminated sites. The results indicated that NH4+, NO2− + NO3−, Si(OH)4 and PO43− concentrations varied by season and were comparatively high in ...
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Gibberellins (GA3) and benzylaminopurine (BAP) affect differently the postharvest life of Calathea zebrina and Hosta sieboldiana
Effects of gibberellic acid (GA3) and/or benzylaminopurine (BAP) either as an immersion (10 min) or a pulse (24 h), with GA3 (0.10, 0.25 mM), BAP (0.10, 0.25 mM) alone or combination of GA3 and BAP (0.10 mM + 0.10 mM or 0.25 mM + 0.25 mM) on the postharvest life of cut leaves of Calathea zebrina and Hosta sieboldiana were investigated. A pulse treatment with 0.10 mM GA3 + 0.10 mM BAP was the most ...
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Integrated management of diluted distillery effluent and fly ash as a potential biofertiliser: a case study on the vegetative growth and chlorophyll content of the marigold plant, Tagetes patula
The distillery is one of the most polluting industries having high BOD and COD. Apart from the organic content, distillery effluent contains macronutrients such as nitrogen and potassium whereas fly ash produced by thermal power plants contains micronutrients such as iron, copper, manganese, zinc and boron essential for the proper growth of plants. Recently, ferti–irrigation in some states has ...
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Comparative plant growth and development in two cotton rotations under irrigated and non-irrigated conditions
Incorporating perennial grasses such as bahiagrass (Paspalum notatum Fluegge) to diversify the conventional two-crop rotation of peanut (Arachis hypogaea L.) and cotton (Gossypium hirsutum L.) prevalent in the U.S. Southeast (SE) is advocated. However, little is reported on growth and development for cotton grown in rotation with perennial grasses. Our objectives were to compare plant ...
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Active sensor reflectance measurements of corn nitrogen status and yield potential
Active sensor reflectance assessments of corn (Zea mays L.) canopy N status are advocated to direct variable N applications and improve N use efficiency (NUE). Our goals were to determine: (i) growth stage and (ii) sensor vegetation index with greatest sensitivity in assessing N status and grain yield. Variable crop N was generated by supplying N at different amounts and times in three field ...
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The role of a hybrid phytosystem in landscape water purification and herbicides removal
The performance of a hybrid phytosystem in landscape water purification and herbicides removal was investigated. The phytosystem operating in an arboretum is located in the Minhang Campus of Shanghai Jiao Tong University, China. The phytosystem is composed of two purification stages: sedimentation Stage 1 without external air supply; and Stage 2 with an external air supply. Stage 2 is also ...
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Leaf spectroscopy
Spectroscopy is a precise and non-destructive technique that can tell us about several processes going on in plants and trees. After being integrated into small handheld devices, it can provide instant and accurate results in the field, forests, and laboratories. It replaces several conventional methods, which were time-consuming and often needed weeks of estimation in expensive laboratories. By ...
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Photosynthetic and cellular toxicity of cadmium in Chlorella vulgaris
The toxic effects of cadmium (Cd) on the green alga Chlorella vulgaris were investigated by following the response to Cd of various toxicity endpoints (cell growth, cell size, photochemical efficiency of PSII in the light or ФPSII, maximal photochemical efficiency or Fv/Fm, chlorophyll a fluorescence, esterase activity and cell viability). These toxicity endpoints were studied in laboratory ...
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Evaluation of nitrogen sources and application methods for nitrogen-rich reference plot establishment in corn
Five different N sources were compared with null N treatment to evaluate their performance for N-rich reference plot establishment in corn (Zea mays L.). The sources, including calcium ammonium nitrate (CAN), urea ammonium nitrate (UAN), polymer-coated urea (PCU) and environmentally smart nitrogen (ESN) in 2007 and 2008, and urea (URE), were broadcast or in-soil banded at the rate of 225 kg N ...
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Damage suffered by swamp morning glory (Ipomoea aquatica Forsk) exposed to vanadium(V)
To elucidate the physiological and morphological responses generated by vanadium (V) in plants, hydroponic culture experiments were performed with swamp morning glory (Ipomoea aquatica Forsk) exposed to 0 to 2.50 mg L−1 pentavalent V [V(V)] in Hoagland nutrient solutions. The concentration of chlorophyll a, chlorophyll b, and carotene peaked at a V(V) concentration of 0.05 mg L−1 and gradually ...
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