| Evaluation of N Impact on Cucumber growing using New Technology |
| Paper ID : 1002-NICAME1402 |
| Authors: |
|
behnam sepehr * Department of Biosystem Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran |
| Abstract: |
| Nitrogen is one of the most important agricultural inputs that has a great impact on plant growth, yield and product quality. Using a chlorophyll meter (Spad) is a new method to speed up the implementation of nitrogen fertilizer recommendations. In order to check the accuracy of Greenseeker and Spad sensors, VNIR spectroscopy method was used. The purpose of this research is to investigate the reliability of the vegetation cover index (NDVI) calculated by the Greenseeker sensor as an indirect indicator of the nitrogen status of greenhouse cucumbers and to compare the performance of this sensor with another optical sensor (Spad). The treatments were fertilized with five levels of nitrogen fertilization (0, 0.028, 0.138, 0.359 and 0.607 g/liter) with 46% urea fertilizer. Before starting the experiments and in order to prevent the lack of other nutrients in the plant, humic acid fertilizer in the amount of 0.5 g/liter was used for all treatments. The reading of the sensors was done once every seven days. The regression relationship between the measured variables was calculated with SPSS software. There was a 95% correlation between the NDVI read by Greenseeker and the amount of fertilizer in the treatments, and a 91% correlation between chlorophyll and the amount of fertilizer. Considering that the coefficient of explanation obtained from spectroscopy (VNIR) is higher than 70% in all cases, the accuracy of Spad and Greenseeker was confirmed as non-destructive methods in measuring greenhouse cucumber greenness. |
| Keywords: |
| Cucumber, Greenseeker, NDVI, Nitrogen, Spad. |
| Status : Paper Accepted (Poster Presentation) |
