measuring rate of photosynthesis
IN THE YARD: Turf war: lawns can suffer heat stress
Cool season turf grasses throughout Virginia are experiencing difficulties associated with summer heat stress.
Heat stress results in the grass becoming weakened to the extent it becomes much more vulnerable to both mechanical and biological stress. Summer decline is therefore a number of individual factors that can interact to cause more summer problems than each individual stress acting alone.
Persistent daytime temperatures of more than 90 degrees, nighttime temperatures above 70 degrees and high humidity have combined to place cool-season turf under significant summer stress.
The fact that these conditions have relentlessly persisted for many since mid-June — especially in central and eastern Virginia — has resulted in direct heat stress injury as well as making the turf more vulnerable to damage from other summer related stresses. Those stresses include excessively close mowing, traffic and wear, warm weather fungal diseases, poor water quality, poor soil drainage, poor air movement and insect damage.
It is often difficult to get a handle on specific causes of summer decline. Put quite plainly, during a period of mid-summer heat stress, the grass plants are more vulnerable to everything that can cause damage.
During cooler times of the year these stresses are either non-existent or the grass is healthier and more tolerant.
Besides air and soil temperatures, another extremely important environmental influence on the plants ability to cool itself through transpiration is the relative humidity. At high relative humidity the plant is much less able to effectively cool itself. As a result the grass is even more prone to heat buildup and direct heat injury.
An important point to remember in measuring heat stress is standard meteorological weather data records temperature at 5 feet above ground and that temperatures of the turf itself will likely greatly exceed the recorded high.
measuring rate of photosynthesis - News
During the shorter, cooler days of fall, cool-season turfgrasses devote much of the food they produce in photosynthesis to root systems and storage for later use. Summer heat injury is complex. However, one difference is we notice the decline as it
measuring rate of photosynthesis - Bookshelf
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Measuring the Rate of Photosynthesis | Scienceray
A lab report measuring the rate at which photosynthesis occurs with the elodea plant.
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