Received: 03-11-2014
Accepted: 04-06-2015
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Effect of Potassium Fertilizer Dosage on Growth and Yield ofJapanese Purple Sweet Potato (Ipomoea batatas Lam.) in Acid Sulphate Soils at Binh Tan District, Vinh Long Province
,
Le Vinh Thuc
2, 3, 4
,
Truong Thi Minh Tam
5
,
Nguyen Bao Ve
2
Keywords
Japanese purple sweet potato, potassium
Abstract
Potassium is an important nutrient for the growth and root yield of sweet potato. An experimentwas carried out to determine the optimal level of potassium for yield and quality of Japanese purple sweet potatoin acid sulfatesoils at Binh Tan District, Vinh Long Province. The experiment was set up in a randomized completed block design with 7 treatments and 3 replications, 35 m2/each replication (7 x 5 m). The treatments were 100 kg N/ha - 80 kg P2O5/ ha combined with 5 levels of K2O (0, 100, 150, 200 and 250 kg K2O/ha) and 80 kg P2O5/ha - 250 kg K2O/ha combined with 125 kg N/ha and 187 kg N/ha. The results showed that 200 kg K2O/ha combined with 100 kg N/ha - 80 kg P2O5/ha increased commercial rootyield of purple Japanese sweet potato by57.4% in comparisonwithzeroapplication of potassium or 31.2% compared with farmers' fertilizationpractice (100 kg K2O/ha). It was suggested thatgrowers should apply thisas recommendation for sweet potato cultivation in acid sulfatesoil at Binh Tan, Vinh Long.
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