| |
| Publication Type:
| Report |
|---|
| Author(s): | Morhard,Jörg;
Henle, Wolfgang;
Kleisinger, Siegfried |
|---|
| Author Affiliation: | Universität Hohenheim, Institut für Agrartechnik, Verfahrenstechnik für Intensivkulturen, Stuttgart-Hohenheim |
|---|
| Title: | Mobile Erfassung des Wassergehaltes in Rasentragschichten mittels IR-Remission |
|---|
| Translated Title: | [Mobile measurement of water content in soil using IR-Remission] |
|---|
| Source: | Rasen-Turf-Gazon. Vol. 33, No. 4, December 2002, p. 80-88. |
|---|
| Publishing Information: | Bonn, Germany: Hortus Verlag |
|---|
| # of Pages: | 9 |
|---|
| Abstract/Contents: | "Water is one of the determining factors of plant growth. The soil is, in this context, the accumulation medium. Stock-taking and the optimum of management of cultivation imply a precise knowledge of the soil water contents, especially in times, when water must be considered an irretreavable natural resource. There are a great number of different methods available to find out the soil water contents, but they are qualified to an only limited extent under practical conditions, because they are either too complicated to handle or too cost intensive to procure or to maintain. It was the purpose of this work to develop a simple, mobile and inexpensive sensor for the soil moisture which permits to absorb a vertical moistors [moisture] profile. For this purpose, two experimental series were carried out by using NIR technology, where the mode of absorbtion of two different wave lenghts [lengths] (900 nm and 1530nm respectively) was used for measurement. The experimental series were carried out by using eight substrates (7 turf carrying layers, 1 sL). Collateral measurements were done gravimetrically and by using the TDR method. Examinations provided the following results: When using the wave length Λ= 900 the water contents could not be measured reliably. The differences of the measuring signals could only secondarily be retraced to the water contents and were caused by the soil colour which darkened the more the water contents increased. In the dry area, up to a soil water contents of roughly 9 quantity per cent, it was possible to reproduce the measurements. Measurement signals which could be differentiated precisely were observed when the wave length Λ = 1530 was used. This wave length lies within the first main absorbtion band of water with the maximum at 1450 nm. Comparisons of the NIRS dates with the measurement series of the mobile IR surface scannets produced a quadration of the measurements values (Y = y2). Linear regression analyses were carried out in dependance of the gravimetric as well as the volumetric water contents. Regression coefficients R2 between 0, 78 and 0, 95 were found in relation to the gravimetric water contents. When evaluating the dependence of the volumetric water contents lower regression coefficients were observed (0,752,0,91). It was possible to reproduce the visually determined colour sequence of the substrates on the basis of the constant factor of the linear function equation. A corresponding increase of the regression evenness could neither be found for all the substances, nor for the gravimetric, nor for the volumetric water contents. When using only one wave length for the determination of the soil water contents a calibration of the IR implement is necessary for each substrate. |
|---|
| Language: | German |
|---|
| References: | 17 |
|---|
| Note: | Abstract appears in German, English, and French
Pictures, color
Figures
Tables
Graphs |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Morhard, J., W. Henle, and S. Kleisinger. 2002. Mobile Erfassung des Wassergehaltes in Rasentragschichten mittels IR-Remission. (In German) Rasen Turf Gazon. 33(4):p. 80-88. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=90110 |
| If there are problems with this record, send us feedback about record 90110. |
| Choices for finding the above item: |
|---|
| 
MSU catalog number: SB 433 .R3 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
