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Web URL(s): | http://www.graszaad.info/onderzoeksverslagen/Proceedings%20of%20the%207th%20IHSC.pdf#page=80 Last checked: 11/21/2014 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Proceedings |
Author(s): | Chynoweth, R. J.;
Rolston, M. P.;
Trethewey, J. A. K.;
McCloy, B. L. |
Author Affiliation: | Chynoweth: Foundation for Arable Research, Lincoln; Rolston and Tretheway: AgResearch Lincoln Research Centre; McCloy: NZArable, Christchurch, New Zealand |
Title: | Predicting spring nitrogen for perennial ryegrass seed crops from NDVI |
Meeting Info.: | Dallas, Texas: April 11-13, 2010 |
Source: | Proceedings of the 7th International Herbage Seed Conference. 2010, p. 69-74. |
Publishing Information: | s.l.: s.n. |
# of Pages: | 6 |
Keywords: | TIC Keywords: Application rates; Lolium perenne; Nitrogen fertilization; Normalized Difference Vegetation Index; Nutrient management; Seed production; Seed yield
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Abstract/Contents: | "Nitrogen (N) fertiliser makes up approximately 15 % of the total cost of growing a perennial ryegrass seed crop. Therefore accurate estimates of applied N fertiliser are important both financially and environmentally. Optical sensors may have the ability to determine the nitrogen requirements and the output expressed as normalized difference vegetation index (NDVI). In two experiments carried out in the 2008/09 season a treatment based on estimating nitrogen requirements using NDVI calculations was implemented. Results were promising with NDVI reading increasing as N rate increased until a saturation level. The NDVI readings were then converted in to a nitrogen nutrition index (NNI) where resulting treatments ranked in the top statistical seed yield group in both experiments. In each experiment this technique applied a lower or equal amount of N fertiliser compared to standard best practice while achieving similar seed yields. If NDVI and NNI can be used to predict N requirement of perennial ryegrass this method could provide a tool for variable rate N applications based on crop variability within a field." |
Language: | English |
References: | 5 |
Note: | Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Chynoweth, R. J., M. P. Rolston, J. A. K. Trethewey, and B. L. McCloy. 2010. Predicting spring nitrogen for perennial ryegrass seed crops from NDVI. p. 69-74. In Proceedings of the 7th International Herbage Seed Conference. Dallas, Texas: April 11-13, 2010. s.l.: s.n. |
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