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Publication Type:
| Report |
Author(s): | Prün, Hans |
Title: | Zur Rasendüngung mit Langzeitdüngern |
Translated Title: | Lawn fertilization with slow-release fertilizers |
Source: | Rasen, Grunflachen, Begrunungen. Vol. 12, No. 4, Dezember 1981, p. 96-104. |
Publishing Information: | Bonn-Bad godesberg, Hortus Verlag |
# of Pages: | 9 |
Keywords: | TIC Keywords: Fertilization; Fertilization timing; Synthetic organic fertilizers; Fertilizer combinations; Nitrogen fertilizers; IBDU; Urea aldehyde condensates; Slow-release fertilizers
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Abstract/Contents: | "Slow-release nitrogen fertilizers are increasingly used in lawn fertilization. Among the most significant of these are the so-called urea-aldehyde condensates such as isobutylidenediurea (IBDU). In this connection we want to point out the following: Their low water solubility, delayed onset of activity, prolonged effectiveness, lower salt content, better plant tolerance, and a more harmonious course of growth. The higher price is justified by simpler and safer handling, fewer spreading operations and thus lower labour costs, less water consumption, and more regular as well as reduced mowing. By adapting the timing of fertilization to the natural growth rhythm, we can produce with 2-3 (instead of 4-7) fertilizations on a sward with a favourable colour aspect, density, and rate of development. Correctly timed applications of urea- aldehyde condensates do not promote lawn diseases. Slow- release fertilizers on a purely organic basis are more temperature dependent and fix part of their nitrogen microbially. They promote lawn thatch, with disadvantages to water supply, colouring and properties of the sward. For an optimal application of different types of slow-release fertilizers, it is important to know their ingredients and the mode of action of the long-term components. The following facts have to be taken into consideration: The Nitrogen Activity Index (AI), originally developed in the U.S. for ureaform, as a laboratory method for chemical-physical solubility data is a measure of the potential availability of the fertilizer nitrogen to plants. In ureaforms it should amount to at least 40 or more. Isodur, as technical isobutylidenediurea, has an AI of nearly 100. The degree of nitrogen utilization is an index that has been determined in plant trials; it indicates the amount of nitrogen that is actually taken up by the plants. Thus it gives information about its biological utilization. Nitrogen in Isodur® is utilized to 50-70% or even more in combinations with urea, ammonium or nitrate. Slow- release fertilizers and combinations containing Isodur (e.g. Floranid®, Rasen-Floranid®, Nitrophoska® permanent) are highly available to plants, are well utilized, and promote length and mass of the roots. Thatch is reduced. Even low and medium rates of nitrogen have a favourable influence on the colour aspect and rate of development. The release of plant-available nitrogen from long-term fertilizers is greatly influenced by moisture, warmth, pH and nutrient level of the soil, as well as the granule size of the fertilizers." |
Language: | German |
References: | 23 |
Note: | Abstract appears in German, English, and French Report given at the Deutsche Rasengesellschaft on September 1, 1981 in Bonn BASF sells IBDU under the tradename of Isodur® Figures Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Prün, H. 1981. Zur Rasendüngung mit Langzeitdüngern. (In German) Rasen Turf Gazon. 12(4):p. 96-104. |
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