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Ciência e Agrotecnologia

Print version ISSN 1413-7054


ARAUJO, Charles de et al. Evaluation of soil sample criteria for the determination of nitrate residue in tomato plants fertirrigated in an unheated greenhouse. Ciênc. agrotec. [online]. 2009, vol.33, n.6, pp.1469-1476. ISSN 1413-7054.

The effect of sample positioning for quantification of residual N-NO3 in soil was determined after cultivating fertirrigated tomato plants. Three experiments were carried out in an unheated greenhouse, using drip fertirrigation. Soil N-NO3 level was determined from samples taken at the end of the cycle of each experiment. In all the experiments, the residual N-NO3 level of the soil was proportional to the amount of N applied in different criteria. Under unheated greenhouse conditions and using nitrogen fertilization by drip fertirrigation, the best soil sampling strategy for residual N-NO3 level determination was obtained by the use of a composite sample taken at a position 10 cm from the plants, between rows, and on the transplant row.

Keywords : Lycopersicon esculentum; soil sampling; fertirrigation.

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