Production of basic potato seed minitubers in substrate and different nitrogen rates

Revista Ceres

Carla De Bem Dos Santos Souza²  Paulo Cezar Rezende Fontes²  Marialva Alvarenga Moreira¹  Mário Puiatti¹  Herminia Emilia Prieto Martinez²  Roberto Fontes Araújo¹ 

[1] ,Universidade Federal de Viçosa Departamento de Fitotecnia Viçosa Minas Gerais ,Brazil

关键词: Solanum tuberosum L.;    propagation;    diagnosis;    chlorophyll meter;    nutrition;    vase;    Solanum tuberosum L.;    propagação;    diagnóstico;    clorofilômetro;    nutrição;    vaso;   

DOI  :  10.1590/S0034-737X2012000600016

来源: SciELO

【 摘 要 】

The optimal dose of nitrogen (N) in potato crop depends on the production system. The objective of this study was to determine the optimal dose of N for the production of basic potato seed minitubers and evaluate the effect of N rates on physiological and nitrogen indices in the youngest fully developed leaf (fourth leaf) and in the oldest leaf of the plants at 60 days after planting. The experiment was conducted in a greenhouse at the Departamento de Fitotecnia da Universidade Federal de Viçosa. The treatments consisted of five N rates (0, 45, 90, 180 and 360 mg dm-3), with 10% of each dose applied at planting and the remainder through irrigation water, daily, for 30 days. The nitrogen rates positively influenced the physiological indices (length, width, leaf area, number of leaves, fresh mass and dry mass) and nitrogen (level and content of N and N-NO³ in the dry mass and SPAD) both in the fourth leaf and in the oldest leaf. Likewise, the N rates positively influenced the number and mass of harvested tubers. The largest number (5.44 tubers/plant) and the maximum mass of tubers (243.5 g/plant) were obtained with 360.0 and 332.9 mg N dm-3, respectively. Therefore, the mass and number of tubers were not optimized by the same N rate. The critical SPAD index was 38.8 in the fourth leaf, which was more sensitive to the effect of N rates than the oldest leaf.

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