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Nitrogen and Potassium Effects on Tomato Salinity Tolerance in Greenhouse

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  022188,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10297) @2002
Authors:   Flávio Favaro Blanco, Marcos Vinícius Folegatti
Keywords:   Salinity, Lycopersicon esculentum Mill., soil solution, nitrogen, potassium, salinity tolerance

Improvement of salinity tolerance of crops is desirable mainly when only high salinity water is available for irrigation. The objective of this trial was to evaluate the effects of different levels of N and K2O applied by fertigation with waters of different salinities on the plant height and yield components of tomato. The experiment was conducted in a greenhouse and treatments were composed of levels of N (7.5, 15.0 and 22.5 g plant-1), K2O (8.0, 16.0 and 24.0 g plant-1) and irrigation water salinity (3.0, 6.0 and 9.5 dS m-1). Drip irrigation management was made by tensiometer readings in order to keep the soil matric potential close to the field capacity. Seedlings were transplanted into pots, which were disposed in single lines spaced 0.5x1.0 m apart. Experimental design was in completely randomized blocks in a 3x3x3 factorial scheme with 5 replications. Water salinity had significant effects on the analyzed variables, while N and K2O showed only isolated effects for some interactions. Reduction of yield, number of fruits per plant and mean weight of the fruits was, approximately, 9%, 4.6% and 6%, respectively, for the increment of one unit of irrigation water salinity.

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