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The performances of three different nitrogen fertilizer recommendation methods were retrospectively tested with data obtained from 150 fertilizer nitrogen trials with sugar beet and 98 trials with potatoes, which were conducted in the Netherlands in the period 19731982. The recommendations consisted of applying a fixed fertilizer nitrogen rate in all situa tions (126 kg N per ha for sugar beet and 286 kg N per ha for potatoes), the current Dutch method, which takes only the amount of mineral nitrogen present in the soil in early spring into account, and a refinement of the current method, which also takes soil type and recent applications of organic manures into account. On average, significantly lower amounts of fertilizer nitrogen were recommended with the current method. The difference from the other methods was on average 25 kg N per ha for sugar beet and 30 kg N per ha for potatoes. With the refined current method the highest crop yields were obtained, but the difference from the other methods was not significant and averaged only 0.3-0.4 t ha"1 for sugar beet and 0.1-0.2 t ha-1 for potatoes. The recovery of fertilizer nitrogen by the potato tubers was 2 % higher with the current method than with the other methods. Based on these findings it is concluded that the current recommendation method is preferable to the other methods.

Evaluation of the performance of three advisory methods for nitrogen fertilization of sugar beet and potatoes.