Manure Vs. Fertilizer- Which Should be Used in Your Organic Vegetable Garden?

Posted by bechtom

June 16, 2008

Vegetable gardeners with experience know that what you put in the soil is one of the deciding factors when it comes to the amount and quality of fruits and vegetables your plants produce. Without the right plant food, nothing else you do is going to matter, and your crops are doomed to fail. The soil must be rich or the garden will be poor.

One distinction that needs to be made when it comes to plant food is the difference between available and non-available plant foods- that is, between foods which it is possible for the plant to use, and those which must undergo a change of some sort before the plant can take them up, assimilate them, and turn them into a healthy growth of foliage, fruit or root. It is just as easily possible for a plant to starve in a soil abounding in plant food, if that food is not available, as it would be for you to go unnourished in the midst of soups and tender meats if they were frozen solid.

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Plants take all their nourishment in the form of soups, and very weak ones at that. To be available plant food must be soluble to the action of the feeding root tubes; and unless it is available it might, as far as the present benefiting of your garden is concerned, just as well not be there at all. Plants take up their food through innumerable and microscopic feeding rootlets, which possess the power of absorbing moisture, and furnishing it, distributed by the plant juices, or sap, to stem, branch, leaf, flower and fruit. There is one startling fact which may help to fix these things in your memory: it takes from 300 to 500 pounds of water to furnish food for the building of one pound of dry plant matter. You can see why plant food is not of much use unless it is available; and it is not available unless it is soluble.

Plant foods consist of chemical elements, or rather, of numerous substances which contain these elements in greater or less degrees. There a very interesting science of this matter. It is evident, however, as we have already seen that the plants must get their food from the soil, and that there are but two sources for such food: it must either be in the soil already, or we must put it there. The only three of the chemical elements mentioned which we need consider are: nitrogen, phosphoric acid, and potash. The average soil contains large amounts of all three, but they are for the most part in forms which are not available and, therefore, may be dismissed from our consideration. (The non-available plant foods already in the soil may be released or made available to some extent by cultivation.) In practically every soil that has been cultivated and cropped, in long-settled districts, the amounts of nitrogen, phosphoric acid and potash which are immediately available will be too meager to produce a good crop of vegetables. It becomes absolutely necessary then, if you want to have a really successful garden, no matter how small it is, to add plant foods to the soil abundantly. When you realize, (1) that the number of plant foods containing the three essential elements is almost unlimited, (2) that each contains them in different proportions and in differing degrees of availability, (3) that the amount of the available elements already in the soil varies greatly, and (4) that different plants, and even different varieties of the same plant, use these elements in widely differing
proportions; then you begin to understand what a complex matter this question of which plant food to use is and why it is so much discussed and so little understood. What a labyrinth it offers for any writer- to say nothing of the reader- to go astray in! I have tried to present this matter clearly. If I have succeeded it may have been only to make you hopelessly discouraged of ever getting at anything definite in the question of enriching the soil. In that case my advice would be that, for the time being, you forget all about it. Fortunately, in the question of plant food, a little knowledge is not often a dangerous thing. Fortunately, too, your plants do not insist that you solve the food problem for them. Set a full table and they will help themselves and take the right dishes. The only thing to worry about is that of the three important foods mentioned (nitrogen, phosphoric acid and potash) there will not be enough: for it has been proved that when any one of these is exhausted the plant practically stops growth; it will not continue to “fill up” on the other two. Of course there is such a thing as going to extremes and wasting plant foods, even if it does not, as a rule, hurt the plants.

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So you know that your plants need available food. The question then becomes what to use. The terms “manure” and “fertilizer” are used somewhat ambiguously and interchangeably. I use manure in a broad sense meaning anything that will rot and enrich the soil, such as well rotted stable manure, or decayed vegetable matter. Organic fertilizers can be purchased pre mixed in any garden center, but for about three to four times as much money as to use natural things or mix the chemical elements into the soil yourself. It depends what you value more, your time or your money!

Between the organic manures, or “natural” manures as they are often called, and fertilizers there is a very important difference which should never be lost sight of. In theory, and as a chemical fact too, a bag of fertilizer may contain twice the available plant food of a ton of well rotted manure; but out of a hundred practical gardeners ninety-nine-and probably one more- would prefer the manure. There are two reasons why. First, natural manures have a decided physical effect upon most soils (altogether aside from the plant food they contain); and second, plants seem to have a preference as to the form in which their food elements are served to them. Fertilizers, on the other hand, are valuable only for the plant food they contain, and sometimes have a bad effect upon the physical condition of the soil. When it comes right down to the practical question of what to put on your garden patch to grow big crops, nothing has yet been discovered that is better than the old reliable stand-by- well rotted animal manure. Hold your objections! We have already seen that plant food which is not available might as well be, for our immediate purposes, at the North Pole. The plant food in “green” or fresh manure is not available, and does not become so until it is released by the decay of the organic matters inside. Now the time possible for growing a crop of garden vegetables is limited; in many instances it is only sixty to ninety days. The plants want their food ready at once; there is no time to be lost waiting for manure to rot in the soil. That is a slow process- especially so in clayey or heavy soils. So on your garden use only manure that is well rotted and broken up. On the other hand, make sure it has not “fire-fanged” or burned out, because manure, if piled by itself and left, is very sure to do. If you keep any animals of your
own, see that the various sorts of manure- except poultry manure, which is so rich that it
is a good plan to keep it for special purposes- are mixed together and kept in a compact, built-up square heap, not a loose pyramidal pile. Keep it under cover and where it cannot wash out. The pile should be turned from bottom to top and outside in and rebuilt, treading down firmly in the process, every month or two- applying water, but not soaking, if it has dried out in the meantime. Such manure will be worth two or three times as much, for garden purposes, as that left to burn or remain in frozen lumps. Of course you can purchase your manure in any garden center or buy fresh manure from a local farmer if you live in the country. When possible, it will pay you to start saving manure several mont

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