不同栽培密度对商薯 8 号农艺性状和经济性状的影响

本研究采用田间试验方法，研究栽培密度对商薯 8 号农艺性状与经济性状的影响。结果表明：T4（60 000 株 /hm2 ）处理的薯块干物质分配率最高，与 T1（37 500 株/hm2 ）相比，150 d 时 T4 处理薯块干物质分配率显著增加 16.14%。 T4 处理的鲜薯干物率明显高于其他 3 个处理。T1 处理的单株薯重、单株最大薯重、单株蔓重显著高于 T2（45 000 株 /hm2 ）、T3（52 500 株/hm2 ）和 T4 处理，T2 处理的 T/R 值显著高于 T3、T4 处理。T3 处理的商品薯产量及商品薯率最 高。生产上选择 52 500 株/hm2 的栽培密度较为适宜。研究结果为商薯 8 号合理栽培提供理论依据。

Effects of Different Planting Density on the Agronomic and Economic Characters of Sweet Potato cv. ‘Shangshu 8’

A field experiment was used to study the effects of planting density on the agronomic and economic characters of ‘Shangshu 8’. The results were as follows: The dry matter distribution rate of potato block of T4 (60 000 plants/hm2 ) was higher than that of the others. Compared with T1 (37 500 plants/hm2 ), the dry matter distribution rate of sweet potato block of T4 was 16.14% higher in 150 d. The fresh potato rate of T4 was significantly higher than that of the other three treatments. In addition, the single plant sweet weight, maximum weight of single plant, single plant weight of T1 were significantly bigger than that of T2 (45 000 plants/hm2 ), T3 (52 500 plants/hm2 ) and T4. The value of T/R of T2 was obviously higher than that of T3 and T4. Besides, the yield of commercial sweet potato and the rate of commercial sweet potato of T3 were the highest in the treatments. The planting density of 52 500 plants/hm2 was more suitable. The research results would provide a theoretical basis for the rational cultivation of ‘'Shangshu 8’.