Analysis on the High-yield Cultivation Model of Virus-free Sweet Potato
[Objective] The study aimed to provide basis for the high-yield cultivation of virus-free sweet potato. [Method] The universal rotational combinational design with quadratic regression was used to study the influences of 4 factors such as N, P and K fertilizers and density and their interactions on the yield of virus-free sweet potato Yushu 7. [Result] The 4 factors had significant regression relation with the yield of sweet potato, their influential effects on the yield of virus-free sweet potato in order were K fertilizer > N fertilizer > density > P fertilizer. The influential effect of interaction between N and K fertilizers on the yield of sweet potato was biggest, that between N fertilizer and density was secondary and that between N and P fertilizers was smaller. As the yield increased, the demand of virus-free sweet potato for K increased. Under the experimental condition, the highest yield of Yushu 7 was 53.0 t/hm2. [Conclusion] When the yield of virus-free sweet potato was over 45.0 t/hm2 , the agronomic measures were as follows: fertilizing N at 63.42 ~74.73 kg/hm2, P2O5 at 67.76~82.24 kg/hm2 and K2O at 106.70~127.71 kg/hm2 and setting density at 4.6× 104~5.3 × 104 plants/hm2.
国家科技期刊平台
NSTL
万方数据
维普
