ISHS Acta Horticulturae 506: International Workshop on Ecological Aspects of Vegetable Fertilization in Integrated Crop Production
QUICK NITROGEN TESTS FOR USE ON BEAN AND SWEET CORN CROPS IN QUEBEC (CANADA) |
| Authors: | N. Tremblay, L. Dextraze, G. Roy, C. Bélec, F. Charbonneau |
| Keywords: | Diagnosis, Merckoquant test strip, Nitrate, Phaseolus vulgaris, Zea mays |
| Abstract:
Experiments and a survey were conducted to assess the potential of quick tests for evaluation of N status of bean and sweet corn crops grown for processing in Quebec (Canada). Merckoquant test strips and the Nitracheck reflectometer were used for NO3-N quantification. Nitrogen fertilization was applied at 5 rates. Nmin contents at sowing were relatively low both in commercial fields or experimental plots. NO3 thresholds in sap at 3 weeks after sowing could be used as a way to quantify topdressing N applications but this NO3 content can vary from year to year. Chlorophyll-meter readings were not correlated to N application at a crop development stage early enough to adjust side dressed N applications. Bean was shown to leave a higher Nmin after harvest than sweet corn and may produce a higher N loss to the environment. | |
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