PRODUÇÃO E QUALIDADE DE BATATA DOCE EM FUNÇÃO DE FONTES E DOSES DE POTÁSSIO

Abstract

The sweet potato, Ipomoea batatas L., is a dicotyledon of the convolvulaceae family. It is a very demanding crop in potassium, being the mineral nutrient most demanded by the crop and decisive in the formation of tuberous roots. Among the country's producing regions, the Northeast is the second largest producer. The objective of this work was to evaluate the effects of sources and doses of potassium on the production and quality of roots of sweet potato variety "granfina". The experiment was conducted at the Macaquinhos site located in the municipality of Remígio state of Paraíba. The treatments were organized in a 2 x 5 factorial scheme, referring to the two sources (potassium chloride and potassium sulfate) and five doses (0, 50, 100, 150 and 200 kg ha-1 K2O) of potassium. Were distributed in randomized blocks and experimental area constituted by a 6 m long plot. The spacing used was 1 m between rows and 0.3 m between plants, irrigation was conducted twice a day using drip tape. The application of 1.05L / m linear bovine manure and 20 g / m linear limestone in the lions, application of total phosphorus in a foundation of 50 kg ha-1 of P2O5, and 40 kg ha-1 of urea (45% N) divided by 50% at 36 days after planting DAP and 50% at 65 DAP. Coverage was applied using potassium chloride (60% K2O) and potassium sulphate (18% K2O, 24% S, 4.5% Mg2 +) applied in proportions (0, 50, 100, 150 and 200 Kg ha-1), divided in 50% at 36 days after planting and 50% at 65 days after planting. The following parameters were evaluated: total number of commercial and noncommercial roots per linear meter, total root mean mass, commercial and non-commercial in grams, and total commercial and non-commercial productivity in tons per hectare. Commercial roots were also analyzed for pH, soluble solids, titratable acidity, soluble solids ratio and titratable acidity, vitamin C, glucose, sucrose and starch. The sources and doses of potassium did not affect production, obtaining averages of 7.7 roots per linear meter, with a mean mass of 238.77 g and a yield of 29.6 tons per hectare.