岩薯5号的主要特征特性及其栽培技术研究

岩薯5号是以岩齿红为母本，岩94—1为父本，于1991年通过有性杂交选育而成。经7年47个点次试验，平均鲜薯产量38．93t／hm^2，比对照增产38．99％，28个点次平均薯干产量10．31t／hm^2，比对照增产了29．22％。平均晒干率26．2％，每kg鲜薯中含胡萝卜素97．00mg、维生素C167．60mg、钙132．00mg、磷426．00mg、铁7．40mg，薯干含氨基酸总量3．70％。高抗蔓割病。该品种属食用和加工用类型品种。岩薯5号的栽培要点是培育壮苗，栽插密度控制在4．5万株／hm^2左右，氮、磷、钾肥配合施用，每1hm^2施用尿素75kg,过磷酸钙150kg、硫酸钾150kg较为合理。适时收获，全生育期控制在150d以内。

Studies on the Main Characters of Yanshu 5 and Its Cultivation Technique

Yanshu 5 was bred from a hybrid of Yanchihong (female) and Yan 94-1 (male)in 1991. The data of 47 different location trials for 7 years showed that its average yield of fresh roots is 38.93 t/hm~2, 38.99% higher than that of the check cultivar, and its average yield of dry roots of 28 locations is 10.3 t/hm~2, 29.22% higher than that of the control. The dry weight rate of the roots is 26.2%. Per kilogram of fresh roots of Yanshu 5 contains carotene 97.00 mg, Vc 167.00 mg, Ca 132.00 mg, P 426.00 mg, Fe 7.40 mg, and the total amino acid of dry roots is 3.7%. Yanshu 5 is highly resistant to Fusarrium oxysporum f.sp. batatas. It can be used for food and industry processing. The keys of cultivation are cultivating strong cuttings, planting 45 000 cuttings per hm~2 approximately with a proper fertilization of urea 75 kg, superphosphate 150 kg, potassium sulphate 150 kg.Its period growth should be controlled as not longer than 150 days.