photosynthetically active radiation Articles
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McCree – photosynthetic active radiation
Institute of Life Science and Biology Department, Texas A and M University, College Station, Texas U.S.A. Spectral quantum yields The aim of these measurements is to provide a factual basis for a standard definition o f “photosynthetically active radiation”. The need for a standard definition has been repeatedly emphasized (e.g., GABRIELSEN, 1940; RABINOWlTCH, 1951, ...
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Photosynthetically active radiation sensor and illuminance sensor
Summary: In the study of plant physiology, the determination of plant photosynthesis is one of the important research work. It is generally measured by measuring the value of illuminance and photosynthetically active radiation, and the measurement of illuminance and photosynthetically active radiation requires a light sensor and photosynthetically active radiation sensor.To understand the ...
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Relationships between photosynthetically active radiation and clearness index at Bloemfontein, South Africa
Relationships between photosynthetically active radiation (PAR) and solar radiation (SR) and between diffuse radiation and global radiation at Bloemfontein, South Africa were investigated. The ratio of PAR to SR (PAR/SR) has been reported from many places in the northern hemisphere, but there were not many PAR/SR measurements documented from the southern hemisphere, including the study region. ...
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PAR Sensor-Photosynthetic Active Radiation Sensor
PAR Sensor Photosynthetically active radiometer, also known as photon number, is mainly used to measure the photosynthetic active radiation of natural light in the wavelength range of 400-700nm. PAR Sensor is simple to use and can be directly connected to a digital voltmeter or data collector. Use under all-weather conditions.Photosynthetically active radiation sensors are designed to measure ...
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New and old soybean cultivar responses to plant density and intercepted light
Genetic gain for new soybean [Glycine max (L.) Merr.] cultivars is substantial, and research suggests this is partially explained by greater tolerance to increased plant densities. We conducted an experiment to determine if greater tolerance to increased plant density and more efficient use of cumulative intercepted photosynthetically active radiation (CIPAR) partially explained the yield ...
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Ecogeographic factors affecting inflorescence emergence of cool-season forage grasses
The ability to predict when a cool-season forage grass cultivar will begin inflorescence emergence under different ecogeographical conditions would allow plant breeders, agronomists, and grass-seed marketers to better position that cultivar into a forage production system. Our objective was to determine the ecogeographical factors (longitude, latitude, elevation, day of year when average daily ...
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Radiation interception and yield response to increased leaflet number in early-maturing soybean genotypes
Early-maturing soybean [Glycine max (L.) Merr.] cultivars require less irrigation than full-season cultivars and may mature before drought periods most often occur in the midsouthern United States. These cultivars require high plant-population densities for radiation interception and acceptable yields, which increase costs. We hypothesized that seven-leaflet genotypes would have greater leaf area ...
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Cotton Planting date: yield, seedling survival, and plant growth
New cultivars, changes in technology and production practices, and climate change may have altered the optimal planting time for cotton (Gossypium hirsutum L.) in the midsouthern United States. A field experiment was conducted from 2002 through 2005 on Gigger silt loam to define planting date (PD) effects on selected cotton cultivars. Six cultivars in 2002 (Deltapine DP555BR and Delta Pearl, ...
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Forest & Plant Canopy Analysis - Tools & Methods
Canopy Analysis for Crop, Forest & Plant Research The range of applications of canopy cover analysis is truly astounding. Canopy analysis derives its usefulness from the vitality of the canopy. Many methods to measure canopy cover have been developed in the last 80 years to meet various objectives. Not surprisingly, there have been several comparisons of the tools in different parts of the ...
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Demystifying Light Levels for Cannabis Grows
As more and more investors, opportunists and growers are jumping onto the green rush that is the cannabis industry right now there is also a big influx of folks who are learning as they go. Lighting is a major purchase for this industry as a big margin of growers still prefer the better climate control and security of growing indoors and even those who choose to grow in a greenhouse are finding ...
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Self-seeded cereal cover crop effects on interspecific competition with corn
Perpetuating cereal cover crops through self-seeding may increase adoption by reducing risk and cost. Winter rye (Secale cereale L.), wheat (Triticum aestivum L.), and triticale (x Triticosecale Wittmack) were used to develop self-seeding cover crop systems in a soybean [Glycine max (L.) Merr.]–corn (Zea mays L.) rotation. Cereal cover crops were planted in varying row spacing configurations and ...
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Full Spectrum Vs. Red/Blue Spectrum LEDs
What is the difference between Red/Blue vs. Broad “Full” Spectrum LEDs? Growers generally have two options when it comes to horticultural LED spectrums – “full spectrum” or “broad-spectrum”, which appears as white light; and “red/blue spectrum”, which can appear as purple or pink light. The red/blue spectrum LED luminaires are often referred ...
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8 Types Of Agricultural Sensors For Best Greenhouse Monitoring Systems
Background A greenhouse is a closed environment that provides optimal conditions for plant growth and promotes plant growth by controlling indoor and outdoor environments. A complete greenhouse remote monitoring system first detects indoor environmental elements through various sensors and then uploads the measurement signals to the control platform through wired or wireless methods, and the ...
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Project Oyster Case Study
Project Overview Oysters play an important role in maintaining balance in aquatic environments. Due to their method of ingesting food by filtering water around them, they act as living purifiers. In fact, they thrive on excess nutrients and algae that may be harmful to other organisms. This property makes them a viable natural solution to managing waterways affected by phytoplankton blooms caused ...
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8 Types Of Agricultural Sensors For Best Greenhouse Monitoring Systems
Background A greenhouse is a closed environment that provides optimal conditions for plant growth and promotes plant growth by controlling indoor and outdoor environments. A complete greenhouse remote monitoring system first detects indoor environmental elements through various sensors and then uploads the measurement signals to the control platform through wired or wireless methods, and the ...
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Maximize Yields with Smart Lighting Strategies: Using Metrics for a More Efficient Grow
There is a strong relationship between lighting and yield, as we know that with every 1% increase in light, there is a 1% increase in growth and yield. Measuring yield in your greenhouse is an important way to measure efficiencies and profitability, so you can better assess how your inputs affect overall yield and plant growth. In this article, we are going to overview the relationship ...
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Influence of environment on plants
There is no denying the importance of light for the growth of plants; however, there are many other environmental factors—such as temperature, moisture and nutrient availability, and soil type–that also influence plant growth. These factors do not act in isolation and are, many times, correlated. So, it is interesting to see how light works in combination with other resources to ...
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The Blob Returns
In the autumn of 2013, Nicholas Bond, who was then the State Climatologist for the state of Washington, first detected a large (500 miles wide x 300 feet deep), circular body of sea water which had not cooled as expected and was 2 to 3 degrees warmer than the rest of the surrounding Pacific Ocean. By mid-2014, this unnaturally warm patch of ocean had grown to 100 miles long x 1000 miles wide x ...
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The Importance of Leaf Area Index (LAI) in Environmental and Crop Research
Leaf Area Index (LAI), which is used as a measure in hundreds of studies on forests, crops, climate and the environment, is calculated as half the area of all leaves per unit area of ground. It is measured as the leaf area (m2 ) per ground area (m–2) and is unit-less. So, a plant with a LAI of 2 has an amount of leaves that can cover a given area two times. LAI is calculated for a plant or ...
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The importance of Leaf Area Index (LAI) in environmental and crop research
Leaf Area Index (LAI), which is used as a measure in hundreds of studies on forests, crops, climate and the environment, is calculated as half the area of all leaves per unit area of ground. It is measured as the leaf area (m2 ) per ground area (m–2) and is unit-less. So, a plant with a LAI of 2 has an amount of leaves that can cover a given area two times. LAI is calculated for a plant or ...
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