DEVELOPMENT OF A SOIL N TEST FOR FERTILIZER REQUIREMENTS FOR WHEAT |
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| Authors: | M Miransari A F Mackenzie |
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| Institution: | 1. Department of Soil Science , Shahed University , Tehran, Iran;2. Department of Natural Resource Sciences , McGill University , Ste-Anne-de-Bellevue, Quebec, Canada |
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| Abstract: | Optimal fertilizer nitrogen (N) rates result in economic yield levels and reduced pollution. A soil test for determining optimal fertilizer N rates for wheat has not been developed for Quebec, Canada, or many other parts of the world. Therefore, the objectives were to determine: 1) the relationship among soil nitrate (NO? 3)- N, soil ammonium (NH + 4)- N and N fertilizer on wheat yields; and 2) the soil sampling times and depths most highly correlated with yield response to soil NO? 3-N and NH + 4-N. In a three year research work, wet and dried soil samples of 0- to 30- and 30- to 60-cm depths from 20 wheat fields that received four rates of N fertilizer at seeding and postseeding (plants 15 cm tall) were analyzed for NH + 4-N and NO? 3 -N using a quick-test (N-Trak) and a standard laboratory method. Wheat yield response to N fertilizer was limited, but strong to soil NO? 3-N. |
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| Keywords: | fertilizer requirements N test organic matter soil N mineralization soil NO? 3 and NH+ 4 wheat (Triticum aestivum L ) production |
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