ISHS Acta Horticulturae 537: III International Symposium on Irrigation of Horticultural Crops
WATER AND NUTRIENT MANAGEMENT EFFECTS ON SOIL VARIABLES AND ON LETTUCE (Lactuca sativa L.) YIELD. |
| Authors: | A.C.A. Gonçalves, R. Rezende, J.A. Frizzone, M.V. Folegatti |
| Keywords: | Irrigation, drip, fertigation, lettuce, soil salinity |
| Abstract:
This study was carried out at the experimental site of the Departamento de Engenharia Rural, ESALQ/USP, São Paulo, Brazil, to study irrigation effects on soil variables and on lettuce yield, with and without fertilization. Nitrogen fertilizer was applied to lettuce by fertigation and conventional fertilization, using two sources of N, urea and ammonium sulfate. Fertilizer was applied four times, every eight days, using the same amount of nitrogen for fertigation as for the conventional application. The lettuce was drip irrigated and the control was based on the Class A Pan placed in the experimental area. pH and electrical conductivity (EC) of the soil solution were measured from soil samples of 0.20 m depth, sampled at 12, 24 and 36 days after the beginning of fertilization. The production variables: fresh matter, dry matter, leaf area, number of leaves and lettuce head diameter were measured. Ammonium sulfate induces greater CE and lower pH values. The crop yield response to urea is better than to ammonium sulfate. The fertigation results were better than the conventional application of fertilizers. | |
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