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In a four year survey, two control methods of nitrogen (N) supply in strawberry were combined. It was found that Nmin analysis could be used as a measurement of control from the beginning of the season, indicating the need of additional N supply. Leaf dry matter analysis, taken during beginning of flowering, could be used as an indicator thus making it possible to make corrections within the season, if needed. This study clearly showed variation in nutrient values among years and cultivars, whereas differences among plants of different age were not significant. It was concluded that the use of Nmin and leaf dry matter analyses combined might make corrections in nitrogen fertilization within the same year possible, and a new standard for leaf nutrient content, based on samples taken during beginning of flowering, was suggested.
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H. Daugaard (2007) studied this question.
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