Parâmetros de crescimento e marcha de absorção de nutrientes na produção de minitubérculos de batata cv. Atlantic. / Growth parameters and uptake rate in potato cv. Atlantic minituber production.

AUTOR(ES)

Patrícia Favoretto

DATA DE PUBLICAÇÃO

2005

RESUMO

As potato is the most important economic annual staple crop in Brazil and its production involves high costs, new alternatives are being adopted to decrease costs and obtain high quality potato seed. This study aimed at determining the growth parameters and the uptake rate by seedling from cv. Atlantic to be used for minituber production in a hydroponic system. It was carried out from setember to november 2004 in Vargem Grande do Sul – SP, located in latitude 21°47’28”S and longitude 046°53’04”W at altitude 938 m. The experimental design was randomized blocks with seven treatments and four replications. The plants were collected and evaluated at weekly intervals from the initial development phase throughout harvesting phase, 53 days after transplanting (DAT). The plants were separated into root system, aerial part and minituber, dried in oven and weighed on an analytical scale in order to obtain the dry mass weight. After drying, the plants were grounded in a mill and submitted to analysis in order to obtain the nutrient extraction for each treatment. The results showed that the nutrient accumulation is influenced by the phase of the crop and the total dry mass weight of plants. The sequence of maximum macronutrient accumulation for the treatments was: K >N >Ca >P >Mg >S, and for the micronutrient it was: Fe >Mn >B >Zn >Cu. The sequence of macronutrient exportation was: K >N >P >S >Mg >Ca, and for the micronutrients it was: Fe >Zn >Cu >B >Mn. The hydroponic system allowed to make the nutrients more readly available to the plants, and, as a consequence, higher rates of multiplcation were observed.

ASSUNTO(S)

absorção de nutriente hidroponic seed potato vegetal growth seedling tuber absorption of nutrient crescimento vegetal batata – semente tubérculo muda hidroponia

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