N, P and K uptake of cabbage, carrot and onion
2001
Salo, T. (MTT Agrifood Research Finland, Jokioinen (Finland))
During the recent decades, researchers dealing with fertilizer recommendations of field vegetables have produced large amount of data from nutrient uptake of the most common vegetables. This data informs, what is the rate of nutrient uptake per edible ton of yield and how much there can be nutrients in crop residues. Tables and several computer programs are nowadays available that estimate the demand of main nutrients according to the estimated yield. Concerning actual recommendations, there is a long history of fertilizer rate experiments that have given the fertilizer rates for good yields and thus for profitable production. Recommendations, usually given as look-up tables, have formed the basis of fertilizer use. Fitting together the existing recommendations and measured nutrient uptakes from field experiments gives a chance to improve nutrient use thus decreasing losses to the environment. Although the crop nutrient demand is reasonably well documented, there are still problems estimating the fertilizer recommendations. Fertilizer recommendations should estimate nutrient supply from different soil types, from mineralisation of crop residues and additionally consider the amount of possible nutrient buffer to produce high yield of good quality. Either this is done using look-up table or computer program, weather of the growing season can create substantial variation. In order to deal with this variation, much work has been done to develop useful soil and plant analysis methods are often too time or money consuming for the farmers
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