ISHS Acta Horticulturae 247: Research and Development Conference on Vegetables, the Market and the Producer
OPTIMIZING NITROGEN FERTILIZATION OF VEGETABLE CROPS BY DRIP IRRIGATION |
| Authors: | C.R. Gastaldi, B.G. Sutton |
| Abstract:
Nitrogen nutrition requirements of lettuce seedlings in recirculating solution culture were investigated. The effects of different NH4-N/ NO3-N ratios on growth of the plants were measured. A growth technique, in which additions of nitrogen increase with time as a result of electrical conductivity and pH titrations was tested. The results obtained showed that a stable internal nutrient status was achieved after 2 weeks. Linear regressions were found between accumulated nitrogen addition and growth, accumulated nitrogen addition and accumulated nitrogen uptake. This information can be employed in establishing conditions for efficient use of N fertilizer in drip irrigation. | |
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