原原种的块茎大小对马铃薯的农艺性状、繁殖系数和产量的影响

选用早熟品种‘荷兰15号’和中晚熟品种‘克新13号’的脱毒原原种为试验材料，分别探讨原原种块茎大小对马铃薯的农艺性状、繁殖系数和产量性状的影响。研究结果表明：‘荷兰15号’原原种，株高对种薯总产的直接作用最大；‘克新13号’原原种，保苗率和株高对种薯总产的直接作用最大。‘荷兰15号’原原种的块茎大小在10－20 g时，繁殖系数最高，原原种的块茎大小在5－20 g时，其种薯的商品薯产量和总产最高。‘克新13号’原原种的块茎大小在7－15 g时繁殖系数、商品薯产量和总产均最高。

Effects of Tuber Size of Pre-elite Seed Potato on Agronomic Traits,Propagation Coefficient and Yield of Potato

Virus-free pre-elite early ripening variety ＆#39;the Netherlands 15＆#39; and middle late ripening variety ＆#39;Kexin 13＆#39; were used as experimental material. The effects of tuber size of pre-elite seed potato on agronomic traits , propagation coefficient and yield of potato were studied. The results showed that for the pre-elite seed potato ＆#39;the Netherlands 15＆#39;, plant height had the biggest direct impact on total yield, while for ＆#39;Kexin 13＆#39;, seedling survival rate and plant height had the biggest direct impact on total yield. When the pre-elite seeds of ＆#39; the Netherland 15＆#39; were in 10-20 g, the propagation coefficient was highest and when in 5-20 g, commercial potato and total potato yield were highest. For ＆#39;Kexin 13＆#39; when the pre-elite seeds were in 7-15 g, propagation coefficient, commercial potato and total potato yield were al highest.