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《Pratacultural Science》 2017-12
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Effects of different planting densities and fertilization levels on yield and quality of sweet sorghum grown under covering film cultivation in the dry land of Qinghai

Yan Hui-ying;Li Chun-xi;Ye Pei-lin;Mao De-hu;Li Rong;Key Laboratory of Adaptation and Evolution of Plateau Biota(AEPB),Northwest Institute of Plateau Biology,Chinese Academy of Sciences;Key Laboratory of Crop Molecular Breeding of Qinghai Province,Northwest Institute of Plateau Biology,Chinese Academy of Sciences;Graduate University of Chinese Academy of Sciences;Animal Husbandry and Veterinary Station of Qinghai,Haidong;Animal Husbandry and Veterinary Technology Service Center of Qinghai Minhe;  
In this experiment,Jitian 5 and Jiutianza 3 were used as materials in an experimental study on the effects of different planting densities.Linespacing×plant spacing:(40 cm×40 cm,40 cm×30 cm,40 cm×20 cm)and amount of urea(0,150,225 kg·ha~(-1))in the topdressing on the yield and quality of sweet sorghum were studied at an altitude of 2 040 mon dry land in Qinghai by covering film cultivation.The results showed that the fresh and hay yields of two cultivars were the highest at the spacing of 40 cm × 20 cm(120 000 hole·ha~(-1)).The yield of fresh grass was 99.75 and 108.17 t·ha~(-1).The hay yieldswere 17.89 and 22.58 t·ha~(-1),respectively.The yield was higher and quality was better at 150 kg·ha~(-1) urea at the jointing stage.The crude protein of the two cultivars was 5.47% and 4.80%,crude fat was 5.67 and 7.57 g·kg-1,acidic detergent fiber was low,and comprehensive performance was good.In conclusion,aplanting density of 120 000 hole·ha~(-1) and topdressing urea of 150.0 kg·ha~(-1) at the jointing stage are most suitable for sweet sorghum in the Qinghai dry land
【Fund】: 青海省科技厅重大科技专项(2015-NK-A3-1-2);; 青海省创新平台建设专项项目——青海省作物分子育种重点实验室(2017-ZJY14)
【CateGory Index】: S566.5
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