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.
Fertilizer labeled 12-4-8 contains 12 percent nitrogen, 4 percent phosphorous and 8 percent potassium. A 10-pound bag of this fertilizer would have 1.2 pounds of nitrogen. An appropriate fertilizer for a magnolia tree would be 12-4-8 or 20-5-10.The amount of fertilizer given is based on the amount of nitrogen required.itrogen is the most important fertilizer to provide for trees. Choose a slow-release fertilizer that contains only nitrogen or with approximately three times more nitrogen than phosphorous. The percentages of nitrogen, phosphorous and potassium are given on product labels.