Abstract
The effects of organic manure, inorganic fertilizer (NPK) and the combination of the two on the roots of sweet potato were studied under field condition. Two sweet potato varieties, that is, ‘Apomuden’ and ‘Santom Pona’ were used for the experiment. The result indicated that on the average, NPK 15-15-15 + Cow dung (CD) (4 tons per hectare) (t/ha); NPK 15-15-15 + Poultry manure (PM) (3t/ha); and NPK 7.5-7.5-7.5 + CD (6t/ha) produced significantly highest responses (32.6%, 31.1%, and 30.9%) root dry matter content respectively. NPK 22.5-22.5-22.5 +CD (2t/ha); sole poultry manure (6t/ha), and NPK 15-15-15 + CD (4t/ha) recorded the greatest protein content (6.1% each) individually. Integrated application of organic manure and inorganic fertilizers (NPK, 15-15-15) is recommended for improved sweet potato production.
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