Soil Science Simplified by Neal S. Eash & Thomas J. Sauer & Deb O'Dell & Evah Odoi
Author:Neal S. Eash & Thomas J. Sauer & Deb O'Dell & Evah Odoi [Eash, Neal S.]
Language: eng
Format: azw3
ISBN: 9781118540633
Publisher: Wiley
Published: 2015-10-05T04:00:00+00:00
Biological Growth Tests
Biological growth tests may also be used to determine nutrient needs. A simple method is to split a field and apply one type of nutrient on one half and another nutrient on the other half. Or try one rate of a nutrient on one half and double the rate on the other half.
Biological tests can also be used in greenhouses for a short growth period. For such “pot” tests, up to a gallon (4 l) of soil is brought into the greenhouse and divided into small, 1-pint (0.5-l) containers, which receive various rates of the nutrients in question (leaving one untreated). Rapid-growing plants (such as small grains) are planted, harvested in a short time (such as 30 days), and weighed to determine which rate provided the greatest growth.
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