Effect of combination of potassium levels and crop varieties in the yield and quality of orange fleshed sweet potato (Ipomoea batatas (L.) Lam
Abstract
A controlled experiment was conducted in the CIP field, located in Nwalate, in Boane district, between October 2015 to March 2016 in order to evaluate the effect of potassium fertilizer on yield and quality of varieties of Orange-Fleshed Sweet Potato (OFSP) (Ipomoea batatas (L.) Lam). The experimental design was in Completely Randomized Blocks (DBCC) in an arrangement of split plots with four (4) replicates, consisting of five (5) varieties of OFSP (Delvia Erica, Lourdes, Irene and Gloria) allocated in the main plots and four (4) potassium levels (0, 50, 100 and 150 kg ha-1) allocated in the sub-main plots. The measured parameters were: yield, contents of β-carotene content, dry matter (MS), starch, reducing sugars and protein. The Erica and Lourdes varieties were the ones that obtained the highest yields of commercial potatoes at all levels of K2O applied, and the maximum productivity was reached when 100 kg.ha-1 of K2O was applied. Regarding the dry matter content, the Gloria variety was the best, with 37%, but the levels of K2O applied had no effect on this variety. The Erica and Lourdes varieties were distinguished by the high production of reducing sugars. Higher levels of β-carotene were recorded in the Erica and Lourdes varieties. The Gloria and Delvia varieties were evidenced from the others regarding the production of starch in all levels of K2O applied. The study is a basis for the development of recommendations of fertilization of the crop to the different producers who intend to maximize the productivity preserving the quality of the roots.
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