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.
Bags of 13-13-13 fertilizer contain dry particles that must be watered after application to release the nutrients. To find the amount of each nutrient in a 40-lb. bag, multiply 0.13 by 40. In this formulation, 5.2 pounds each of nitrogen, phosphorus and potassium are available, for a total of 15.6 pounds.hese three numbers represent the content of primary nutrients in the fertilizer formulation: nitrogen, phosphorus and potassium. By looking at the numbers on a fertilizer bag, homeowners can calculate how many pounds of each nutrient are contained within the bag.