Ação de silicato e conservação pós-colheita em raízes de mandioquinha-salsa (Arracacia xanthorrhiza Bancroft)

• Autor(a) principal: Souza, Lilian Maria de Campos
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1206
• topic: Batata-baroa; Silício; Conservação pós-colheita; Fisiologia; Refrigeração; Potato baroa; Silicon; Postharvest conservation; Physiology; Refrigeration; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

In arracacha, vegetable of high final price, keeping the physical integrity of its roots is important to value this product. The objective of this work was to evaluate the absorption capacity of mineral nutrients of two plantations of arracacha grown with Agrosilício® or with lime (agricultural lime) and to determine the effects in the conservation postharvest of the roots grown with Agrosilício® or lime. The treatments were: T1 dolomitic lime in the dose of 1,000 kg ha-1 (saturation for basis at 60%); T2 - Agrosilício® (Harsco Minerais) in the dose of 1,000 kg ha-1; T3 Agrosilício® in the dose of 2,000 kg ha-1 (double the recommended dose for liming), evenly mixed to the soil. The clumps were dug out with a mattock, the roots were then removed and taken to the postharvest lab/ UFV. By the content of Si absorbed by the leaves and according to the classification proposed by Ma and Takahashi (2002), the arracacha can be considered an 'intermediate' species in the Si accumulation. The increase in the external concentration of Si with treatment T3 calcium silicate and magnesium (2 ton ha-1) led to the increase of the concentration of Si in the aerial parts and roots. The treatment T3 calcium silicate and magnesium (2 ton ha-1) was more efficient than T1 dolomitic CaCO3 (1 ton ha-1) at increasing the potassium absorption in the plantation ‗Amarela de Carandaí . In plantation ‗Senador Amaral had better response with T1 dolomitic CaCO3 (1 ton ha-1) compared to the plantation ‗Amarela de Carandaí at increasing the content of potassium. The roots of ‗Amarela de Carandaí kind, grown with T1 dolomitic lime (1 ton ha-1) and with T3 calcium silicate and magnesium (2 ton ha-1) had linear loss of fresh mass of the roots, when stored at 4ºC and 8ºC, for 60 days. PVC film was beneficial in keeping low the breathing rate of the roots in T1 and T3, and sugars accumulated during the cold exposure were not consumed up to 60 days of storage. The roots grown with T1 dolomitic lime (1 ton ha-1), at 4ºC had an increase in the content of reducing sugars in comparison with the 8ºC, indicating a possible effect of the low temperature in the accumulation of reducing sugars and the sensibility of the arracacha roots to cold.