Abstract:

Suitable cultivation models designed for certain varieties could increase crop yield and reduce the excessive use of chemical fertilizers. Using the starch-rich sweet potato cultivar ‘Taizhong 9’ as planting material, a field trial with general rotary regression design under 5 factors was conducted to study the effects of nitrogen, phosphate, potassium, planting density and cultivation time on yield of fresh storage roots. Our results indicate that these factors in order of importance are potassium fertilizer (X3), phosphorus fertilizer (X2), planting density (X4), nitrogen fertilizer (X1) and cultivation time (X5). The suitable model for ‘Taizhong 9’ in the 1532 combinations with yield between 3265.15 and 4127.96kg/666.7m2 can be designed as N 10.7-11.88 kg/666.7m2, P2O5 5.44-6.01kg/666.7m2, K2O 15.15-19.83kg/666.7m2，planting density of 4048～4525 plants/666.7m2, and cultivation time from April 22 to 29. This study provides a basis and reference for high-yield cultivation of cultivar ‘Taizhong 9’ in the region.