chlorophyll a Articles
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Using full-scale duckweed ponds as the finish stage for swine waste treatment with a focus on organic matter degradation
The rapid increase in the number of swine has caused pronounced environmental impacts worldwide, especially on water resources. As an aggregate, smallholdings have an important role in South American pork production, contributing to the net diffusion of pollution. Thus, duckweed ponds have been successfully used for swine waste polishing, mainly for nutrient removal. Few studies have been ...
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Arsenite stress variably stimulates pro‐oxidant enzymes, anatomical deformities, photosynthetic pigment reduction and antioxidants in arsenic tolerant and sensitive rice seedlings
Contamination of arsenic (As) in rice (Oryza sativa L.) paddies and subsequent uptake by rice plants is a serious concern as rice is the staple crop for millions. Identification of As toxicity and detoxification mechanisms in paddy rice cultivars would help to reduce As‐associated risk. Arsenic tolerance and susceptibility mechanisms were investigated in two differential As accumulating rice ...
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The response of phytoplankton and microlayer-adapted bacteria to monolayer application in a humic, eutrophic irrigation dam
Repeat applications of artificial monolayers to farm irrigation dams to reduce evaporative loss may adversely affect water quality by enhancing populations of microlayer-adapted bacteria and blue-green algae. The microlayer, subsurface and water column of a 16 ha dam were monitored every two weeks for 18 months, to benchmark the seasonal dynamics of phytoplankton and microlayer-adapted ...
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Effects of foliar-applied ethylene inhibitor and synthetic cytokinin on creeping bentgrass to enhance heat tolerance
Heat stress is a major factor causing leaf senescence and other physiological damages in cool-season grass species. Cytokinins and ethylene are two major plant hormones affecting leaf senescence. The objective of this study was to determine whether foliar application of an ethylene synthesis inhibitor (aminoethoxyvinylglycine, AVG) and a synthetic cytokinin (trans-zeatin riboside, t-ZR) would ...
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Impact of Phakopsora Pachyrhizi infection on soybean leaf photosynthesis and radiation absorption
Yield loss in soybean [Glycine max (L.) Merr.] due to soybean rust (SBR) (caused by Phakospora pachyrhizi Syd. & P. Syd.) has been associated with reduced radiation interception and reduced radiation use efficiency by green leaf area. The objective of this study was to determine the mechanisms involved in the SBR-induced reductions in radiation use efficiency by quantifying the effect of SBR ...
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Effect of deficit irrigation and fertilization on cucumber
Soil water budgets are essential in determining the proper timing and amount of irrigation. Organic fertilizers can be substituted for commercial fertilizers; however, information is sparse on the interaction of irrigation management and nutrient source on cucumber (Cucumis sativus L.) production. This study evaluated nutrient source and irrigation management on growth and yield of cucumber grown ...
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Ecological characteristics of plankton and aquatic vegetation in Lake Qiluhu
Investigations of the phytoplankton, zooplankton, zoobenthos and aquatic vegetation in Lake Qiluhu were carried out in February, 2009. Over the whole lake, 13 sampling sites were set up for the analysis of phytoplankton and zooplankton, and 22 profiles for the collection of macrophytes and zoobenthos. In the survey, 7 phyla, 65 algae species were identified. The average abundance of ...
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Biochar impact on physiological and biochemical attributes of Spinach (Spinacia oleracea L.) in nickel contaminated soil
Disastrous effect of nickel on spinach was discussed by number of authors but the effect of amendments like biochar with nickel on Spinacea oleraceaL. is not still discussed by any author of the world because biochar was used as soil amendments which play a vital role in reducing mobilization and uptake of nickel by spinach plants. As nickel contaminated plants are very harmful for the ...
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Optimization of crop canopy sensor placement for measuring nitrogen status in corn
Active canopy sensors can be used to assess corn (Zea mays L.) N status and direct spatially-variable in-season N application. The goal of this study was to determine optimal sensor spacing for controlling whole- and/or split-boom N application scenarios for a hypothetical 24-row applicator. Sensor readings were collected from 24 consecutive rows at eight cornfields during vegetative growth in ...
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Secondary production of freshwater zooplankton communities exposed to a fungicide and to a petroleum distillate in outdoor pond mesocosms
Ecological Risk Assessment (ERA) of chemicals in mesocosms requires measurement of a large number of parameters at community scale. Studies on invertebrate communities usually focus on taxonomic approaches which only provide insights into taxonomic structure changes induced by chemicals. In the present study, abundance, biomass (B), theoretical production (P) and instantaneous P/B ratio were ...
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A review of mercury concentrations in freshwater fishes of Africa: Patterns and predictors
The methylated form of mercury (methylmercury) is a potent neurotoxicant and a contaminant of concern for fisheries because of its potential effects on ecosystem and human health. In Africa, inland fisheries are a crucial component of food and economic security, yet little information is available on Hg contamination trends. The authors compiled published data on mercury (Hg) contamination in ...
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How to analyze photosynthesis in plants: Methods and tools
Life as we know it would be impossible without photosynthesis. Outside of providing the essential elements that support life on earth, photosynthesis is of special importance to the food and agriculture industry, as well as for ecologists studying climate change. In addition, there are many commercial enterprises which depend heavily on photosynthesis. As a result, there are a plethora of methods ...
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Response of nitrogen uptake and partitioning to critical nitrogen supply in oat cultivars
Nitrogen uptake and partitioning in oat (Avena sativa L.) are not well documented. A greenhouse study was conducted to determine the critical timing of N supply on the growth, N uptake, and partitioning. Plants grown in plastic pots were subjected to five N fertilization regimes: (i) control, N supply from seedling to physiological maturity (PM); (ii) N supply from seedling to flag leaf; (iii) N ...
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Nitrogen recommendations for corn: An on-the-go sensor compared with current recommendation methods
Precision agriculture technologies provide the capability to spatially vary N fertilizer applied to corn (Zea mays L.), potentially improving N use efficiency. The focus of this study was to evaluate the potential of improving N recommendations based on crop canopy reflectance. Corn was grown at four field sites in each of 2 yr in Centre County, Pennsylvania. Preplant treatments included: zero ...
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Continuous Data Delivers Added Protection for Singapore Fish Farmers
Overview Continuous water quality monitoring in the Strait of Johor supports an early warning system that helps fish farmers in Singapore protect their aquaculture operations from harmful algal blooms. Challenge Aquaculture has become an industry of special interest in Singapore. Yet, much of the country’s farmed fish comes from coastal operations vulnerable to sudden and dramatic ...
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NIR & spectroscopy in agriculture & crop science
According to a review by Dr. Crocombe, hand-held spectrometers have historically been used by only small groups of people, such as analytical and drug companies. These days, spectroscopy is available in simple low cost devices for a multitude of applications for scientists and non-scientists alike. One of the most prominent uses of spectroscopy has been the use of the technology on leaves for ...
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Micronutrient research using leaf area & photosynthesis rates to improve crop yields
With the pressure to increase food production, every agricultural practice that can be optimized for improving crop yield is under scrutiny; therefore, micronutrients, which are important for crop health and growth, are receiving more attention. Agronomists are increasingly studying different treatment methods to establish the easiest and most cost-effective way to improve micronutrient ...
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Production status of bio organic fertilizer
The fertilizer produced by bio organic fertilizer equipment can improve soil ecological environment and change soil microbial flora, and play a more important role in reducing crop diseases and insect pests. In the process of microbial growth and reproduction, it can secrete a variety of antibiotics and plant growth and elements. It can not only inhibit the activities of plant pathogenic ...
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Impacts of altered light spectral quality on warm season turfgrass growth under greenhouse conditions
Warm-season turfgrass quality declines under shade due to reduced photosynthesis, increased disease pressure, reduced carbohydrate production, tree root competition, and reduced lateral stem growth. Another factor limiting turfgrass growth and development under tree shade is variable qualities of light filtered by trees. However, effects of various filtered wavelengths on turfgrass performance ...
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Why are we monitoring nutrients at different depths?
Recently, LG Sonic introduced the MPC-Lab, an innovative monitoring buoy that can monitor algae, physico-chemical variables, and even nutrients such as nitrogen and phosphorus in near real-time and at different depths in a body of water. Combined with our other monitoring tools, this system offers a unique way to detect the spatial and temporal patterns of nutrient concentrations which play a ...
By LG Sonic
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