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ISHS Acta Horticulturae 852: IV International Symposium on Ecologically Sound Fertilization Strategies for Field Vegetable Production

RELATIONS BETWEEN OPTICAL PROPERTIES AND N STATUS OF TOMATO LEAVES

Authors:   M. Gauder, J. Pfenning, H.-P. Liebig, S. Graeff, W. Claupein
Keywords:   remote sensing, reflectance, site-specific nutrition, N deficiency, yield
Abstract:
An efficient use of N fertilizers in intensive vegetable production systems is one of the most important keys to reduce harmful side effects on the environment and to produce yield with high quality in a competitive market. Due to the fact that the N level in the soil and in the plant can vary highly during cropping period and within a field area, the measurement of the current and site-specific N status of plants can be a rewarding effort for the cultivator. Nevertheless, sensor based systems to detect the N status in real time have been scarcely implemented for horticultural purposes. This study was conducted with the objective to evaluate the use of a non-invasive sensor technology using spectral feedback signals from tomato leaves. The results indicate that it is possible to infer the N status of tomato crops using optical sensor technologies. Accordingly, the study showed that corresponding to N fertilization the use of optical sensors can supply data to specify the N input to an accurate level.
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