The arrowroot plant is native to the tropics of South America. It has a long history of cultivation by native peoples, who developed an extensive treatment process for extracting the usable powder from the roots. The roots are washed, scraped, beaten, soaked, pulped, and finally forced through a sieve.
A 100 pound bag of 16-4-8 contains 16 pounds of nitrogen, 4 pounds of phosphorus and 8 pounds of potassium. The rest if filler and minor elements. Even though it may cost more, a fertilizer containing slow release nitrogen is more efficient and cost effective in our sandy soils.ounding this number to six, you would apply six pounds of 16-4-8 fertilizer per 1000 square feet of lawn area. Using 12-4-8 fertilizer, you would apply eight pounds per 1000 square feet.
(3.8 lb fertilizer per 1000 sq ft) Ã 0.05 phosphate = 0.19 lb phosphate per 1000 sq ft. (3.8 lb fertilizer per 1000 sq ft) Ã 0.10 potash = 0.38 lb potash per 1000 sq ft. Another common problem involves determining the area that a bag of fertilizer can cover and how many bags are needed to cover large sites.xample: Find out how much phosphate and potash you are applying to the turf when you apply 3.8 lb of the 26-5-10 fertilizer per 1000 sq ft. Multiply the amount of fertilizer you are applying (3.8 lb per 1000 sq ft) by the percentage of phosphate in the bag (5%).