Influence of the N/K ratio on the production and quality of cucumber in hydroponic system

Revista Ceres

Adriene Woods Pedrosa²  Herminia Emilia Prieto Martinez¹  Edson Marcio Matiello¹  Paulo Cezar Rezende Fontes¹  Paulo Roberto Gomes Pereira¹ 

[1] ,USP Escola Superior de Agricultura Luiz de Queiroz Departamento de Produção VegetalPiracicaba SP ,Brazil

关键词: Cucumis sativus L;    nutrient solution;    ammonium;    biometric evaluation of fruits;    Cucumis sativus L;    solução nutritiva;    amônio;    avaliação biométrica dos frutos;   

DOI  :  10.1590/S0034-737X2011000500012

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the quality of fruits and the nutritional status of cucumber CV. Aodai cultivated in nutrient solutions with different N:K ratios. The hydroponic cultivation was initially performed, during the vegetative growth, in nutrient solution with 1:2.0 mmol L-1 N:K, and, later, during fruit setting, in four different nutrient solutions with N:K (w/w) at the ratios 1:1.4, 1:1.7, 1:2.0 and 1:2.5. An additional treatment with a nutrient solution containing the ratio 1:2.2 (w/w) N:K during the vegetative growth and N:K 1:1.4 (w/w) during fruit setting, both with 10% ammonium (NH4+) was included. The treatments were arranged in a randomized design with six replicates. Irrigation was carried out with deionized water until seed germination, and then with nutrient solution until 30 days after germination, when plants were transplanted. Plants in the hydroponic growing beds were irrigated with the solutions for vegetative growth, and, after 21 days, the solutions were replaced by solutions for fruit setting. At 45 and 60 days after transplanting, the fresh weight, length, diameter, volume and firmness of the fruit were evaluated, and, at 45 days after transplanting, the macronutrient concentrations in the leaves were determined. The use of different N:K ratios during fruit setting influenced the cucumber production. The ratio of 1.0:1.7 N: K (w/w), with 10% of N in the form of ammonia, is recommended for the whole cycle.

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