Researches on Balanced Fertilization Technology of Sweet potato

This project aimed to increase sweet potato yield and quality through optimum fertilization, and establish the soil nutrient classification indexes and demonstrate balanced fertilization technology for sweet potato. Field trials were carried out in Guanyun county and Liuhe district of Nanjing, Jiangsu province by Jiangsu and Hubei Academy of Agricultural Science in 2011.

Results from Hubei and Jiangsu showed that the highest dry matter yield (13,905 kg/ha) and best net profit were obtained with applications of 135 kg N/ha and 160 kg P₂O₅/ha. However, in Hubei, the highest dry matter yield (9,600 kg/ha) and best net profit were obtained with applications of 165 kg N/ha and 248 kg P₂O₅/ha. The results emphasized the need for developing site-specific fertilizer recommendations for a crop. Jiangsu-11