| Effects of balanced fertilization on yield and quality of high starch content sweet potato |
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| DOI：10.7606/j.issn.1000-7601.2011.05.30 |
| Key Words: balanced fertilization sweet potato yield quality |
| Author Name | Affiliation | | QIN Yusheng | Soil and Fertilizer Institute, Sichuan Academy of Agriculture Sciences, Chengdu, Sichuan 610066, China | | TU Shihua | Soil and Fertilizer Institute, Sichuan Academy of Agriculture Sciences, Chengdu, Sichuan 610066, China | | FENG Wenqiang | Soil and Fertilizer Institute, Sichuan Academy of Agriculture Sciences, Chengdu, Sichuan 610066, China | | HUANG Gang | Sichuan Academy of Agriculture Sciences, Chengdu, Sichuan 610066, China | | LIU Yuchi | Soil and Fertilizer Institute, Sichuan Academy of Agriculture Sciences, Chengdu, Sichuan 610066, China
College of Resources and Environment, Sichuan Agricultural University, Yaan, Sichuan 625014, China |
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| Abstract: |
| A field experiment was conducted to investigate effects of balanced fertilization on yield and quality of two high starch content sweet potato cultivars Xushu 22 and Chuanshu 34 in the rain-fed hilly region of Sichuan Basin. Results showed that compared with the control (no fertilizer treatment) the balanced fertilization treatment significantly increased tuber yield by 40.2%～56.0% for Xushu 22 and 38.7%～52.7% for Chuanshu 34, a modest increment of starch content by 1.5 to 3.3 percentage points for Xushu 22 and 0.2 to 6.7 percentage points for Chuanshu 34. Under high yield cultivation, it required 0.64 to 0.87 kg N, 0.09 to 0.11 kg P2O5 and 0.88 to 1.39 kg K2O to produce every 100 kg dry tube yield for Xushu 22 and 0.71 to 0.88 kg N, 0.07 to 0.13 kg P2O5 and 0.70 to 1.14 kg K2O for Chuanshu 34. Compared with one basal application, split application of all fertilizers as basal and side-dressings significantly improved tuber starch content by 4.1 percentage points for Xushu 22 and 6.9 percentage points for Chuanshu 34. Considering both yield and quality as a whole, 45 kg/hm2 N, 45 kg/hm2 P2O5 and 90 kg/hm2 K2O can be regarded as the optimal application rates under the experimental and similar conditions. |
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