Abstract: To study the growth performance and agronomic differences of different types of forage sorghum (Sorghum bicolor) in the dryland area of Gansu Province,growth stages,agronomic traits,yield,forage quality and yield of 13 forage sorghum varieties of 5 types were measured in field experiments. The growth performance of different types was significantly different at the jointing stage with obvious differences in agronomic traits. Photoperiod sensitive brown midrib genotypes had the highest yield of fresh-grass and dry matter,reaching an average of 130.29 t·hm^-2 and 36.04 t·hm^-2,respectively. Early maturing brown midrib genotypes had the highest crude protein and total digestible nutrients content,with an average of 6.34% and 59.76%,respectively. The neutral detergent fiber and acid detergent fiber content were the lowest in early maturing BMR genotypes,with an average of 46.76% and 31.04%,respectively. Yield of crude protein and total digestible nutrients per unit area was the highest in photoperiod sensitive brown midrib genotypes,reaching an average of 2.00 t·hm^-2 and 18.99 t·hm^-2,respectively. High dry matter yield is the precondition of high nutrient yield of forage sorghum.

Key words: Forage sorghum, Agronomic trait, Grass yield, Nutrient content, Nutrient yield, Correlation

摘要： 为探讨不同类型饲草高粱（Sorghum bicolor）在甘肃旱作区的表现及差异。本研究采用大田试验，选取5类13个饲草高粱品种为试验材料，通过对其生育期、农艺性状、产草量、营养成分含量和产量的测定与分析。结果表明：不同类型饲草高粱各生育阶段差异明显，主要农艺性状具有明显差异；鲜草和干物质产量均以光周期敏感褐色中脉类型最高，分别平均达130.29 t·hm^-2和36.04 t·hm^-2；粗蛋白和总可消化营养物含量均以中熟褐色中脉类型最高，平均分别为6.34%和59.76%；中性洗涤纤维和酸性洗涤纤维含量均以中熟褐色中脉类型最低，平均分别为46.76%和31.04%；单位面积粗蛋白和总可消化营养物产量均以光周期敏感褐色中脉类型最高，平均分别达2.00和18.99 t·hm^-2，干物质产量高是饲草高粱营养物质产量高的前提。

关键词: 饲草高粱, 农艺性状, 产草量, 营养成分含量, 营养成分产量, 相关性