THE PROCEDURE FOR FOLIAR SUPPLEMENTATION IN ORDER
TO OBTAIN PLANTS WITH THE GUIDED CONTENT AND
DISTRIBUTION OF SELENIUM
The field of technology to which the invention belongs
The invention belongs to the field of foliar supplementation and represents the procedure of Selenium absorption from the foliar surface of plants which is treated with the formulation on the basis of Sodium selenite or the combination of urea and Sodium selenite.
According to the international classification of patents (ICP) the sign is C 05.
The problem which could be solved by patent protection
The invention solves the problem of raising plants with the guided content .and distribution of Selenium by foliar application of the formulation on the basis of sodium selenite or the combination on the basis of sodium selenite and urea at determined stages of plants development in order to obtain the desired distribution and optimum content of selenium, and at the same time to check the content of copper and of other elements essential to the plant.
The present invention status
It has been proved that the low content of selenium in the soil and the plants can be a significant factor of risk to human and animal health. On the other side investigations of selenium concentration have shown that the regions with a low content of selenium are more widely spread than the regions with a sufficient or toxic content. According to investigations of the soil, plants, nutrition .and population Serbia belongs to the regions with low selenium contents.
Selenium deficient regions use various supplementations with selenium in order to increase selenium intake by domestic animals and humans. In agricultural practice fertilizers with selenium are more rarely used for the correction of selenium deficiency in nutrition.
Plants which do not accumulate selenium and which are used in human and animal nutrition are treated with such fertilizers.
The newest results have shown that the use of various supplements with selenium to food is not a good choice when it happens that a larger geographic region is more or less selenium deficient, and that the required and safe intake of selenium by all inhabitants can be provided only if the natural selenium content in local agricultural products is increased.
In to days patents procedures for foliar application of one or more polyvalent ions necessary to plants were proposed (Tsivon Y., 9732830 WO Patent No. 9732830). They are Fe+3, Fe+2, Mn+2 , Cu+2 , Zn+2 , Ca+2 , and Mg+2. None of the patents includes foliar supplementation of plants with Se.
Data on application of selenium in various plant species are mentioned in literature. They point out that foliar supplementation of Se salts produces smaller or greater increase of its content in plants, and that the quantity and distribution of selenium accepted by the plant depend on a series of factors. The papers known to us do not define either conditions that should be met in order to get the best possible results from foliar application or the stages of plant development most suitable for such application of selenium. They also mention that selenium has been foliary applied together with pesticides and insecticides. In spite of a series of factors contributing to a greater benefit from foliar application (more efficient intake independent of soil, quicker response of plants etc.) this application is not so widely spread as the supplementation of plants with selenium, in the first place because of great variations in the quantity of bound Se.
Essential aspects of the invention
The procedure used to obtain plants with the guided content and distribution of selenium by foliar application of the formulation based on sodium selenite or the
combination based on sodium selenite and urea at certain stages of the plant' s development makes it possible to get the desired content and distribution of selenium in plants (for example, a higher increase of the selenium content in the grains than in other overground parts and the root, the same increase of the selenium content in plants as a whole).If the foliar supplementation with nitrogen is carried out in practice then selenium and nitrogen can be simultaneously supplemented with the application of one technological operation. Specialists who are supplementing plants with nitrogen through soil can also supplement them with selenium by foliar application of the formulation based on sodium selenite.
Detailed description of the invention
The invention solves the problem of plant supplementation by foliar application of the formulation based on sodium selenite or the combination based on sodium selenite and urea. If they are applied at certain stages of plant development the following results can be obtained: 1/ optimum selenium usage, 2/ desired selenium distribution in plants, 3/ optimum selenium content in plants, 4/ better regulation of acceptability of copper and of other elements essential to plants.
Advantages of the procedure for foliar treatment of plants with the formulation based on sodium selenite or the combination of sodium selenite and urea in comparison to procedures for supplementation through soil are as follows:
1. Minimum consumption of sodium selenite;
2. Better soil independent acceptability of selenium;
3. Quick selenium absorption;
4. Possibility to obtain desirable distribution of selenium in the plant;
5. Possibility to minimize variations of the selenium content in the plant choosing the optimum stage of plant development for application;
6. Better regulation of absorption of the other elements essential to plant.
7. Low or practically no possibility to disturb the existing soil condition.
Advantages of the procedure for foliar treatment of the plant with the formulation based on sodium selenite or the combination of sodium selenite and urea in relation to other procedures for foliar supplementation are as follows:
1. Possibility to obtain the desired selenium distribution in the plant;
2. Possibility to minimize variations of the selenium content in the plant choosing the optimum stage of plant development for application;
3. Better regulation of absorption of the other elements essential to the plant.
Tests done on agricultural species clearly showed that the stage of plant development is the crucial factor for successful foliar application. Another important factor of success is the quick absorption of Se from the foliar surface (the plant absorbs 50% of Se in the first 30-45 min. of treatment).
Examples of foliar application of the formulation based on sodium selenite and urea in experimental fields with wheat, rye, barley, oats, maize, soybeans, livestock peas, beans and potatoes are given in Tables 1, 2, 3, 4,5,6, 7, 8, 9 and 10
Table 1.
Treatment Se, μg/kg
Grain Vegetative tissue
Wheat
Control 20 - 30 16 - 25
6 g Se/ha sprayed 11.04. '97 40-57 52-61
6 g Se/ha and 25 kg urea/ha sprayed 11.04J97 46-67 50-62
6 g Se/ha sprayed 12.05J97 58 - 62 40 - 46
6 g Se/ha and 25 kg ureaha sprayed 12.05.'97 60 - 71 35 - 42
12 g Se/ha sprayed 12.05/97 64-85 42 - 51
12 g Se/ha and 25 kg urea sprayed 12.05. '97 118 - 150 48-59
24 g Se/ha and 25 kg urea sprayed 11.04J97 71 - 80 74 - 96
24 g Se/ha and 25 kg urea sprayed 12.05. '97 136 -178 52 - 61
Table 2.
Treatment Se,μg/kg
Grain Vegetative tissue
Rye
Control 10-14 8-12
10 g Se/ha sprayed 25.03.'96 39-48 49-56
10 g Se/ha and 25 kg urea/ha sprayed 25.03J96 44-53 55-59
10 g Se/ha sprayed 29.04. '96 63-70 38-45
10 g Se/ha and 25 kg ureaha sprayed 29.04J96 67-74 39-44
Table 3.
Treatment Se,μg/kg
Grain Vegetative tissue
Barley
Control 7-9 6-10
12 g Se/ha sprayed 22.03. '96 35-51 44-50
12 g Se/ha sprayed 01.05.'96 53-66 40-48
24 g Se/ha sprayed 01.05. '96 98-107 56-67
24 g Se/ha and 25 kg urea/ha sprayed 01.05. '96 102-135 55-62
Table 4.
Treatment Se, μg/kg
Grain Vegetative tissue
Oats
Control 8-13 8-11
10 g Se/ha sprayed 12.05.'96 47-56 42-53
10 g Se/ha and 25 kg urea/ha sprayed 12.05.'96 46-61 41-51
10 g Se/ha and 25 kg urea/ha sprayed 24.05.'97 56-66 38-43
Table 5.
Treatment Se, μg/kg
Grain Vegetative tissue
Maize
Control 9-14 7-11
12 g Se/ha sprayed 23.05.'96 30-46 26-37
12 g Se/ha and 30 kg urea sprayed 23.05.'96 75 - 106 28-34
12 g Se/ha sprayed 04.06. '97 32-46 27-36
12 g Se/ha and 30 kg urea sprayed 4 June. '97 68-77 22-30
Table 6.
Treatment Se, μg/kg
Seed Vegetative tissue
Soybeans
Control 9-15 7-12
6 g Se/ha sprayed 25.05. '96 19-24 19-28
12 g Se/ha sprayed 25.05/96 22-27 25-32
Table 7.
Treatment Se, μg/kg
Seed Vegetative tissue
Beans
Control 5-9 5-7
6 g Se/ha sprayed 25.05/96 9-11 10-13
6 g Seha sprayed 11.06/96 14-17 8-11
Table 8.
Treatment Se, μg/kg
Seed Vegetative tissue
Livestock peas
Control 18-23 12-15
6 g Se/ha sprayed 25.05/96 28-34 26-31
Table 9.
Treatment Se, μg/kg
Tuber Vegetative tissue
Potatoes
Control 4-9 5-7
6 g Se/ha sprayed 23.05/96 12-14 15-19
12 g Se/ha sprayed 07.06/96 17-19 16-20
Table 10.
Treatment Grain
Se, μg/kg Cu, mg/kg
Wheat
Control 20 2.4
6 g Se/ha sprayed 12.05/97 58 2.8
6 g Se/ha and 25 kg urea/ha sprayed 12.05/97 66 3.0
12 g Se/ha sprayed 12.05/97 64 3.0
12 g Se/ha and 25 kg urea sprayed 12.05/97 120 3.3
24 g Se/ha and 25 kg urea sprayed 11.04. '97 80 3.1
24 g Se/ha and 25 kg urea sprayed 12.05/97 150 3.4