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If applied when preemergent herbicide is needed, the fertilizer may burn or stress the lawn. If applied after the lawn "green-up", weed seeds will have already germinated and the herbicide will be ineffective. [3] Preemergants do not prevent seeds from germinating, they prevent cell division, and prevent vital parts of the weed from forming
[21] [16] The first industrial kelp liquid fertilizer, Maxicrop, was created by Reginald Milton in 1947. [26] The creation of liquid fertilizer has allowed for more widespread application of seaweed-derived fertilizer to inland regions and sparked a growing agronomic interest in seaweed for a variety of agricultural applications, including ...
[13] [15] [16] In 1926, Milorganite made its debut as the first pelletized fertilizer in the United States, [7] with sales directed at golf courses, [4] turf farms, and flower growers. [17] The brand was popularized during the 1930s and 1940s before inorganic urea became available to homeowners after WWII. [citation needed]
A 50-pound (23 kg) bag of fertilizer labeled 16-4-8 contains 8 lb (3.6 kg) of nitrogen (16% of the 50 pounds), an amount of phosphorus equivalent to that in 2 pounds of P 2 O 5 (4% of 50 pounds), and 4 pounds of K 2 O (8% of 50 pounds).
The values in an NPK fertilizer label are related to the concentrations (by weight) of phosphorus and potassium elements as follows: P 2 O 5 consists of 56.4% elemental oxygen and 43.6% elemental phosphorus by weight. Therefore, the elemental phosphorus percentage of a fertilizer is 0.436 times its P value. K
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