Friday, March 15, 2013

Time to Buy Organic Fertilizer

Hey, all! Do you have your seeds yet? I'm still waiting on some to arrive in the mail. While I do, I'm planning the amount of nutrients I'll need to buy from my local gardening supplier. 

Sea Minerals from SeaAgri, Inc.

The macro nutrients you'll need to add to your soil are listed below. I have put a * next to my choice of each macro nutrient.


Good sources of organic Nitrogen include:

Alfalfa Meal
You'll need 184 ounces per 100 square feet of leaf vegetables or 120 ounces per 100 square feet of root vegetables (root veggies do not like to be inundated with nitrogen).

Soybean Meal
76 ounces per 100 square feet of leaf vegetables or 50 ounces per 100 square feet of root vegetables.

Blood Meal*
38 ounces per 100 square feet of leaf vegetables or 25 ounces per 100 square feet of root vegetables.
I choose blood meal as my source of nitrogen, because it takes a smaller amount of fertilizer compared to alfalfa meal or soybean meal to supply the soil with nitrogen, and it is more readily available from my local garden supplier.


Good sources of organic Phosphorus include:

Rock Phosphate
You'll need 13 ounces per 100 square feet.

Bone Meal*
23 ounces per 100 square feet.
This is my go-to source for phosphorus, because rock phosphate is radioactive. Therefore, I do not recommend supplementing with rock phosphate. This is one of the biggest reasons why tobacco products are poisonous - tobacco plants are extremely efficient at soaking up the radioactive material in rock phosphate, which is how most commercial tobacco growers choose to supply their tobacco plants with phosphorus. Solution: grow and cure your own for a safer smoke.


Good sources of organic Potassium include:

Wood Ashes
You'll need 77 ounces per 100 square feet.

108 ounces per 100 square feet. This is the most readily-available source of potassium in my area. It's pretty, too! Just like the name, it is sand that is green. Note to self: cool crafting/decorating idea.

108 ounces per 100 square feet.

Wild animals love to tear into the soft, plastic bags to get to these nutrients. Be sure to store them in plastic buckets with lids or other sealed containers. I had raccoons tear into my bone meal and destroy the whole bag last year! 


In addition to the macro nutrients mentioned above, you'll need to make sure you're supplying your plants with micro nutrients such as calcium, magnesium, boron, copper, etc. To accomplish this, I use SeaAgri's Sea-90 Natural Water Soluble Plant Fertilizer. (No, I'm not being compensated in any way for mentioning this product.) One 10-pound bag will last you many years, but you can buy the sea minerals in larger quantities if you so desire. SeaAgri gives helpful instructions on the bag that will help you figure out how much you need to apply to your soil.

In later posts, I will talk about doing soil testing to determine the condition of your soil and how to raise/lower the pH as needed. Thanks for dropping by!


  1. These organic fertlizers are good to know. I have been throwing all our vegetable scraps into my garden in hopes that it fertilizes it.

  2. Thanks for all the good suggestions. I am looking into getting some bone meal and green sand. I may have to come back and get a reminder later this month when we are ready to buy.