What is uniformity of germination?
Uniformity of soil moisture is necessary so all seeds have the same access to water. Adequate soil moisture begins with uniform planting depths greater than 1.5 inches to avoid uneven soil moisture caused mainly by tillage patterns through the field.
How do you calculate the coefficient of germination?
Final germination percentage (G) = the total seeds germinated at end of trial/number of initial seeds used 100 times. Mean germination time (MGT) = ΣFx/ΣF; where F is the number of seeds germinated on day x. Mean germination rate (MGR) = CV/100 = 1/T; where T is mean germination time and CV: coefficient of velocity.
What is a good germination rate for seeds?
It’s not necessary to have 100% success with a germination test. Obviously the higher the better, but anything above a 50% success rate for seeds is acceptable – just sow two seeds per station for the best chance of at least one germinating. It would be prudent to replace seeds if germination rates are lower than 50%.
What is plant uniformity?
Plant spacing uniformity (or variability) is measured most often by “standard deviation” (SD), a calculation of how much plant-to-plant spacings differ from their average. A perfect “picket fence” stand, with every plant exactly the same distance from its neighbors, has a standard deviation of zero.
Why is uniformity desired in crop production?
Improving uniformity begins with minimizing the negative effects of management and environmental factors that contribute to plant-to-plant variability in this system — uneven residue distribution, inconsistent seed spacing and depth, inadequate starter nitrogen fertilization, and greater disease and insect pressure ( …
What is coefficient rate of germination?
The coefficient of velocity of germination (CVG) (Jones and Sanders, 1987) gives an indication of the rapidity of germination. Its value increases when the number of germinated seeds increases and the time required for germination decreases.
What is germination rate index?
The germination index (GI), which is a measure of the percentage and speed of germination , indicates a slight difference between each variety in response to temperature and light regime (Tables 1 and 2). Higher values for this measure indicate a greater rate of germination .
What are the condition needed for germination?
All seeds need water, oxygen, and proper temperature in order to germinate. Some seeds require proper light also. Some germinate better in full light while others require darkness to germinate. When a seed is exposed to the proper conditions, water and oxygen are taken in through the seed coat.
Why do we need to test the germination percentage of seeds?
A seed germination test will give growers a good idea of what will germinate in the field. If the test determines that is a low germination percentage, throw the seeds away and purchase more. Doing the germination test early in the year will give more time to purchase seeds.
What is the problem with genetic uniformity?
Genetic uniformity can potentially exacerbate disease epidemics in two distinct ways: by increasing pathogen transmission success within host populations (Wolfe 1985), and by promoting the evolution of specialized pathogens that are highly adapted to particular host genotypes (Barrett 1981).