Qu T G.Characteristic vegetable——winter and spring planting technology of Medicago polymorpha .China Agricultural Technology Extension,2002,35(5):19-20.(in Chinese)

Lu Y P,Jin Z Y,Zhang X H.Specification and non pollution cultivation techniques for Medicago polymorpha .Agricultural Equipment and Technology,2008,34(3):51-52.(in Chinese)

Wei Z W,Ren H L,Wu Z N,Liu G Z,Chen X,Qiao Z H.A new Medicago polymorpha cultivar Huaiyang Jinhuacai.Acta Horticulturae Sinica,2015,42(11):2335-2336.(in Chinese)

Yang J Z.Effects of sowing date on growth period characters,yield and quality of different soybean varieties in pattern of wheat/corn/soybean intercropping.Master Thesis.Ya’an:Sichuan Agricultural University,2006.(in Chinese)

Deng G Y,Wang S S.Agro climatic basis of suitable sowing date of crops.Chinese Journal of Agrometeorology,1988(2):13-15.(in Chinese)

Li L.The study on the effect of rapeseed yield quality and production potential under different sowing date and density.Master Thesis.Wuhan:Huazhong Agricultural University,2005.(in Chinese)

Lu W C,Liu Y H,Yan H R,Zhang L,Liang J L,Liu F.Preliminary study on the effect of planting date on soybean growth and yield components.Heilongjiang Agricultural Science,2001(3):17-19.(in Chinese)

Lan T,Pan J,Jiang D,Dai T B,Cao W X.Effects of Eco-environments and sowing dates on the relationships between grain quality traits in winter wheat.Acta Tritical Crops,2005,25(4):72-78.(in Chinese)

Karmakar P G,Tiwari S P,Kumar V.Seed-filling duration and height of insertion of the lowest pod in Indian soybean varieties.Soybean Genet.Newsl,1994(21):104-107.

Qu L X,Fu H G,Zheng L D,Shen C B.Effect of different sowing date on yield of Medicago polymorpha in paddy field.Shanghai Agricultural Science and Technology,2005,25(6):104-105.(in Chinese)

Xu C,Yuan F J,Xue S M. Medicago polymorpha ——Farmer vegetables for becoming rich.Rural Practical Technology,2007(3):50.(in Chinese)

Yu X J,Wang Y R,Zeng Y J,Su D.Effects of temperature and osmotic potential on seed germination of Cleistogenes songorica and Plantago lessingii. Acta Ecologica Sinica,2004,24(5):883-887.(in Chinese)

Meng K,Mi F G,Li X Y,Ji X T.Seed germination characteristics and their correlation analysis of 15 alfalfa varieties.Animal Husbandry and Feed Science,2015,36(10):53-57.(in Chinese)

Chen Y,Li X E,Zhang J,Si D Z.Germination temperature of seeds of medicinal plants.China Journal of Chinese Materia Medica,1991,16(3):142-145.(in Chinese)

Zhao B,Yang X Y,Shen X Q.Effects of drought and cold stress on seeds germination of Thymus vulgaris .Pratacultural Science,2015,32(11):1808-1814.(in Chinese)

Jia J,Han Q F,Zhou F,Jia Z K,Wang J P,Yang B P.Effects of different N/P ratio on forage yield components and nutritional composites in non-irrigated land.Chinese Journal of Grassland,2009,31(3):77-81.(in Chinese)

Zhao D,Tian X H,Du W H.The suitable sowing date for 20 new triticale lines in Dingxi region of Gansu Province.Pratacultural Science,2016,33(4):722-730.(in Chinese)

Mei X Y,Shen Y X.A study on optimized sowing date of seasonal cultivation alfalfa along Huai River region Pratacultural Science,2012,29(11):1743-1748.(in Chinese)

Liu G B,Qiao R F,Zhao H M,Xie N.Study on the suitable sowing period of alfalfa in Heilonggang area.Pratacultural Science, 2007,24(7):30-33.(in Chinese)