Articles
DIAGNOSIS OF N STATUS IN STRAWBERRY (FRAGARIA x ANANASSAS DUCH)
Article number
654_29
Pages
257 – 262
Language
English
Abstract
The purpose of this work was to determine the critical nitrogen (N) and N dilution curve for strawberry.
An experiment was carried out in a greenhouse under hydroponics conditions.
Strawberry plants (cv. Aromas) were planted in pots in a gravel/coconut fiber substrate.
Seven N levels (0, 0.01, 0.1, 0.3, 3, 9 and 30 mM in the irrigation water) were applied.
Five samplings, every month from planting date, were done in order to monitor aerial dry mass and N content.
Significant differences in dry matter accumulation between N treatments were observed.
Dilution curves could be fitted to each treatment, and different patterns were observed: strong dilution at low N levels, almost no dilution at high N levels, and intermediate behaviour for the 3 mM level.
The critical N curve was determined, and fitted with the dilution model.
Parameters a, corresponding to maximum N concentration in the plant, and b, corresponding to the dilution factor, could be estimated.
The a value obtained in this work is consistent to that of other crops in the C3 group.
The b value obtained in strawberry indicates a much lower N dilution than in all crops mentioned in literature.
This suggests that other factors that could influence the N dilution curve need to be studied.
Although the critical N curve could be established for strawberry under greenhouse conditions, additional research is needed to validate it in field conditions and obtain more accurate parameter values.
An experiment was carried out in a greenhouse under hydroponics conditions.
Strawberry plants (cv. Aromas) were planted in pots in a gravel/coconut fiber substrate.
Seven N levels (0, 0.01, 0.1, 0.3, 3, 9 and 30 mM in the irrigation water) were applied.
Five samplings, every month from planting date, were done in order to monitor aerial dry mass and N content.
Significant differences in dry matter accumulation between N treatments were observed.
Dilution curves could be fitted to each treatment, and different patterns were observed: strong dilution at low N levels, almost no dilution at high N levels, and intermediate behaviour for the 3 mM level.
The critical N curve was determined, and fitted with the dilution model.
Parameters a, corresponding to maximum N concentration in the plant, and b, corresponding to the dilution factor, could be estimated.
The a value obtained in this work is consistent to that of other crops in the C3 group.
The b value obtained in strawberry indicates a much lower N dilution than in all crops mentioned in literature.
This suggests that other factors that could influence the N dilution curve need to be studied.
Although the critical N curve could be established for strawberry under greenhouse conditions, additional research is needed to validate it in field conditions and obtain more accurate parameter values.
Publication
Authors
R. Cárdenas-Navarro, L. López-Pérez, P. Lobit, O. Escalante-Linares, V. Castellanos-Morales, R. Ruíz-Corro
Keywords
strawberry, fertilization, nitrogen, dilution curve
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