草业学报2011，Vol.20Issue(1)：31-37,7.
高丹草生长动态及收割期的研究
Growth dynamics and optimum harvest period of sorghum hybrid sudangrass
摘要
Abstract
To understand the growth regularity and confirm the best harvest time for sorghum hybrid sudangrass, its growth rate, fresh and dry matter accumulation and distribution during different growth stages were investigated, and its nutrient values evaluated in a field experiment. Plant height, growth rate, yield and ratio of leaf to stem of sorghum hybrid sudangrass all fit a Logistic model under dry farming conditions. Growth rate was slow until the 50th day after seeding when it increased until the 80th day, after which, it slowed until the 110th day. There were no obvious trends of crude fat (EF) and hydrocyanic acid (HCN) while crude fiber (CF), nitrogen-free extract (NFE), dry matter yield, gross energy (GE), digestible energy (DE), metabolizable energy (ME), and total digestible nutrient (TDN) all increased. Crude protein (CP) and crude ash (CA) declined from tillering to the booting stages. Fresh yield was maximal at the later jointing stage (121.7 t/ha) while CP, CA, EF, CF, NFE and TDN were maximal at the 1. 915 t/ha, 1. 956 t/ha, 0. 271 t/ha, 7. 749 t/ha, 10.75 t/ha and 13 358 MJ/ha stages respectively. Dry matter yield was maximum at the booting stage (31.1 t/ha) while CP, CA, EF, CF, NFE and TDN were maximal at 1. 920 t/ha, 2. 126 t/ha, 0. 348 t/ha, 9. 070 t/ha, 15.51 t/ha, and 17 383 MJ/ha, respectively. It is suggested that for a high grass yield of sorghum hybrid sudangrass to be used as a green feed, it should be harvested in the later jointing stages while for a better dry matter yield and nutritive value as processing silage or hay, it should be harvested at the heading stage.关键词
高丹草/生长动态/收割期Key words
sorghum hybrid sudangrass/ growth dynamics/ harvest time分类
农业科技引用本文复制引用
刘建宁,石永红,王运琦,郭锐,吴欣明,郭璞,张燕,高新中..高丹草生长动态及收割期的研究[J].草业学报,2011,20(1):31-37,7.基金项目
国家科技支撑项目(2007BAD56B02).国家牧草产业体系项目和山西省攻关项目(20080311030-2)资助. （2007BAD56B02）
