Produtividade e qualidade de batata cv. Atlantic em função de fontes potássicas

Abstract

Potato is an important food source for the world, and to evaluate the effect of the percentage of potassic sources (double sulphate of potassium and magnesium and potassium chloride) Atlantic cultivar, the experiment was conducted in Whermann farm, located in Cristalina-GO, from 19 July to 19 November 2011. The experimental design was a randomized block design with seven treatments (T1=100%K2SO4MgSO4;T2=12,5%KCl/87,5%K2SO4MgSO4;T3=25%KCl/75%K2SO4MgSO4;T4=50%KCl/50%K2SO4MgSO4;T5=75%KCl/25%K2SO4MgSO4;T6=12,5%KCl/87,5%K2SO4MgSO4 e T7=100%KCl) and four replications in a factorial design with split plot. The plots were related to treatments and the subplots at times (26, 47, 68, 89 and 110 DAP). The percentages of double sulphate of potassium and magnesium (K2SO4MgSO4) and potassium chloride in the accumulation of potassium, sulfur and chlorine in the leaves and tubers as well as the main productive characteristics as soluble solids, classification of tubers, tuber number and yield were evaluated. At 56 and 75 DAP , it was found accumulated in leaves higher levels of 1.22 and 11.1 g plant - 1 potassium and chlorine, respectively. The accumulation of S on leaf potato was influenced by potassium fertilization at 89 DAP where differences between treatments were observed, with the greatest concentration of 4, while the lowest was 7, did not differ from the others. In tuber treatments 7, 1 and 2 were higher, and at about 91 DAP at the maximum rate was 1.31 g plant - 1. Treatments 1 and 2 had higher accumulations of S, where the DAP 110 reached 1.12 g plant - 1. The highest values of accumulation of chlorine in tubers during the cycle were 0.10, 0.90, 0.10, 0.13, 0.13 and 0.13 g plant - 1 at 92, 104, 88, 87, 86 and 82 DAP, respectively, with the 47, 68 and 89 DAP, differences between treatments. The treatments had no influence on the content of soluble solids classification and productivity. The numbers of tubers suffered interference of treatments in the last two collections, where the 110 DAP showed 18.22, 19.70, 19.96, 20.39, 19.20, 16.01 and 13.79 tubers plant - 1 for treatments 1, 2, 3 , 4, 5, 6 and 7 respectively. The potato cultivar Atlantic was influenced by potassium fertilization on accumulation of nutrients from leaves and tubers and number of tubers plant - 1, which was not influenced in the standings, the soluble solids and tuber yield.