FR2522923A1 - Feed for gradually adding nutrient to soil - may use sachet of porous plastics contain additive and allow it to disperse over period - Google Patents

Abstract

The feed effects the gradual addition of nutrients to the soil, adding a set quantity at a steady rate over a period of several weeks or more. The additive, in the form of a powder or hygroscopic granules or a liq. is incorporated in a package made of material which is permeable to water vapour. The container may be pierced by small holes which allow the gradual escape of the additive. It may be made of porous material, i.e. a sachet of porous plastics material.

Description

 The present invention relates to a device making it possible to supply anti-corrosion or nutritive elements to soils over a period of time.

 For a long time now, we have noticed that the qualities of a soil, and consequently the yields that it makes possible, depend, in large part, on its content of so-called "essential" elements, namely : nitrogen, phosphorus and potassium, as well as the presence or absence of secondary elements or trace elements which can be added in the form of sulfates (magnesium, sulfur, zinc, copper) of chelates iron, borates, etc ...

 From these observations, we naturally tried to artificially add missing elements to the soil in order to improve their possibilities. Thus was born the fertilizer industry whose development has always been growing.

 The most recent developments in this industry are based, on the one hand, on the search for increasingly sophisticated fertilizer formulations, and on the other hand, on a simplification of their implementation, which results in a lowering of their cost price.

 For this purpose of simplification, it was thought that it would be particularly advantageous to reduce the frequency of fertilizer applications as much as possible, by developing products with nutritive or anticarential action, capable of acting for prolonged periods which may be longer. to a year.

This is how we have developed fertilizers commonly known as "retarded nitrogen" consisting in particular of a ureaformaldehyde channel, which only allow their active ingredient, namely nitrogen, to escape over a period of time.

 Attempts have also been made to develop so-called "delay" fertilizers in which the active products are enclosed in a shell.

 However, we have never succeeded in obtaining fertilizers whose duration of action is greater than 18 months, and we have always encountered the risk of "bursting" as a result of the humidity which leads to a release. immediate active products.

 Therefore, it has so far not been possible to manufacture "delay" fertilizers having a long-lasting action which is prolonged over time.

 The present invention proposes to extend the field of application of this type of fertilizer with a so-called "delay" action, that is to say spread over time, to practically all types of nutrients or anticarentials capable of 'be brought to the soil, and this while increasing the duration of "action" of such fertilizers so as to obtain fertilizers whose action programmed in time may exceed three years.

 To this end, the present invention relates to a device making it possible to supply the soils with the anti-deficiency or nutritive elements which they need, while delaying their release into the soil so as to make only a single supply of fertilizer which can act over a year, or even two, thereby making it possible to achieve a significant saving in labor.

 To this end, the invention relates to a device of the above type, characterized in that it consists of a closed package permeable to water vapor containing an active product containing the anticarential or nutritive elements to be brought to the soil. , in the form of a powder or hydroscopic granules or a liquid.

 The device according to the invention has an almost universal field of application, that is to say it can be used both in the field of plantations (vines and shrubs) and for the cultivation in container pots (horticulture and nurseries) or in bags (market gardening).

 According to another characteristic of the invention, the container is made of a plastic material and can, for example, be pierced with very small holes capable of letting out the anticarential or nutritive elements to be brought to the soil, in a manner spread over time. .

 The shape of these holes can be any without departing from the scope of the invention. One can, for example, provide holes in the shape of a cross or slits, according to the desired flow. Of course, the importance and the number of holes so as well as the dose of active products to be used depends on the type of soil, the size and type of plant that one wishes to grow there, as well as the duration of the desired action.

 According to a preferred characteristic of the invention, the container is made of a porous material, and is in particular constituted by a sachet made from a film of a porous plastic material.

 In all cases, the container of the device which is the subject of the invention acts in accordance with the principles of osmosis.

 This means that, as a first step1 due to the hygroscopic properties of the active product, the container is filled with water. This water dissolves part of the anticarential or nutritive elements which then gradually migrate towards the outside of this container, owing to the difference in the densities of these elements between the interior of the container and the surrounding soil.

 The device according to the invention can, for example, find an application in the planting of the vine in limestone soils.

 Indeed, we are used to adding to limestone soils a small spoon of iron chelate for each vine plant so that it quickly finds the strength necessary for its balance. However, this iron chelate which is partly assimilated in the first year, is then leached and therefore lost and it is therefore always necessary to renew the intake of chelate for at least three consecutive years.

 This obligation is avoided by the use of the device according to the invention. In fact, in accordance with the invention, the dose of iron chelate necessary for each vine plant for three years is enclosed in a porous plastic bag or box and pierced with small micro-holes in order to let escape a small amount of produced over time. We thus manage to provide the vine plants with a single quantity of iron chelate necessary for a minimum duration of three consecutive years, which represents a considerable saving in labor.

 In addition, alongside iron chelate, it is possible to add trace elements and certain fertilizers, the formulas of which are established according to the nature of the soil.

 Of course, the surface of the osmotic film is chosen according to the desired duration of action and the type of fertilizer used.

 In the case of solid fertilizers or chelates, if you want, next to the action spread over time, an immediate action, as for example for planting, you can add to the action of osmosis, micro-holes, the number of which depends on the desired flow.

Claims (4)

CLAIMS 1) Device making it possible to add anti-sensitive or nutritive elements to the soil over a period of time, device characterized in that it consists of a closed package permeable to water vapor containing an active product containing the anticarential or nutritive elements to bring to the soil in the form of a powder or hygroscopic granules or a liquid.  20) Device according to claim 1, characterized in that the container is made of plastic.  30) Device according to any one of claims 1 and 2, characterized in that the container is pierced with very small holes capable of letting out the anticarential or nutritive elements to bring to the soil in a manner spread over time.  40) Device according to any one of claims 1 to 3, characterized in that the container is made of a porous material.  50) Device according to claim 4, characterized in that the container consists of a bag made from a film of a porous plastic.