Generally there are two different types of attitudes when it comes to cooking. Either throw the ingredients together by look, feel and taste or measure each ingredient precisely.
When it comes to cooking it is fun to experiment. However soil is entirely a different scenario that can result in one or more season's of heart ache if you make soil amendment additions a guessing game.
A few weeks ago lime was discussed and the fact that wood or other fire ashes are high in potassium (K) and result in soil pH elevations. It is critical to use care when incorporating soil amendments and to soil test rather than guess when adding fertility to soil.
Many like to add compost or other organic matter to soil to improve soil. At five percent organic matter, a soil is black. Most of our soils in the area are not black so there is less than five percent organic matter. A strategy over time to increase organic matter in a soil from two upwards to three percent is very significant in terms of soil improvement.
Organic matter is responsible for a soil resisting soil compaction and its ability to hold nutrients and water. Like clay, organic matter has negative charge thereby allowing it to hold nutrients that have a positive charge. One should never add sand to a garden spot as it, when mixed with our native soil types increase the likelihood of soil compaction and sand is poor for holding water while being incapable of holding nutrients.
The carbon to nitrogen ratio is very important to consider when making soil amendments. When high carbon to nitrogen ratio items are added to soil, plants become nitrogen starved and will remain so for some time.
In fact it is possible that plants would be incapable of surviving. A ratio of 25:1 or lower is necessary to stay out of trouble. Wood chips, saw dust, etc, has a very high carbon to nitrogen ratio typically 40:1 or more.
A common question, "Can I add mulch, wood chips or saw dust to my garden?" As long as the material remains on the surface as a mulch weed barrier there should not be a problem. The problem occurs when one mixes this wood material into the soil and soil microbes starve the soil of nitrogen in an effort to decompose the wood product.
Legume material is at or below the 25:1 ratio. Legume material would include soybean stover, alfalfa, or red clover materials. Straw has a higher ratio, although less than wood, so it would not be good to mix into soil.
Horse manure is one of the better manures to add to soil. Adding manure to soil for building organic matter requires that care be taken to not add weed seed from straw. Also horse manure comprising of large amounts of wood shavings should not be mixed into the soil due to the carbon to nitrogen ratio issues already mentioned. Poultry manure is very rich with nitrogen and can actually burn plants.
The tag on a fertilizer bag has three numbers which are the amount of nitrogen (N), phosphorus (P), and potassium (K). Hence, a bag of 10-4-3 is ten percent N, four percent P and three percent K.
Since soils have a negative charge and N is either in a negatively charged form or quickly converted by microbes to a negatively charged state, it is highly susceptible to loss from the soil. Both P and K are not easily lost from soil if applied at proper rates. Since one cannot determine by any of the five senses these soil levels, soil testing is critical to know what soil amendments are needed.
You can contact the local Purdue Extension Office by calling 829-5020 x14 in Owen County or 448-9041 in Clay County for more information or publication copies regarding this week's column topic or to RSVP for upcoming events. Please call first to assure items are ready when you arrive and to RSVP for programs. While most publications are free, some do have a fee. All times listed are Eastern Time.
April 8 -- Bi-State Forestry Workshop, Beef House, 6:30 p.m.
April 12 -- Sheep Shearing School, Greencastle, 9 a.m.
April 16 -- Developing Business Plan for New Venture & Finance Options, Spencer 6:30 p.m.
April 17 -- IBEP Bull Sale, Springville, 6 p.m.
April 19 -- Indiana MarketMaker: Marketing 101, Bloomington, 1:30 p.m.
April 23 -- Test Drive your New Business Plan, Spencer, 6:30 p.m.
April 24 -- Starting a Specialty Food Business, Indianapolis, 8 AM
April 26 -- Pond Workshop, Clay County, 9 a.m.
April 30 -- Attracting Customers to Your Produce Market Spot, Spencer, 6:30 p.m.
April 30 -- Fish Cleaning Workshop, Bloomington, 6 p.m.
May 1 -- Fish Cleaning Workshop, Crawfordsville, 6 p.m.
May 3 -- Owen County Farmers Market Opens
May 3 -- Pond Workshop, Prairie Creek Park (Vigo), Noon
May 12 -- Farmer's Market Workshop, Greencastle
May 19-21 -- Indiana Recycling Coalition Conference & Exhibition, Bloomington