A study on the impact of nitrogen application and harvest time on theseed yield of Tibetan wild Elymus nutans in Lhasa valley, Tibet

Abstract

Abstract: Tibetan wild Eylmus nutans is a common perennial forage grass adapted to local climatic conditions, and it has high nutritional value, palatability, and excellent resistance . A 3-year (2006-2008) study was conducted on Tibetan wild E. nutans seed production the region’s unique natural and climatic features of Qushui county, Lhasa valley, Tibet, The field experiments explored the, yield and quality of seeds at different harvest times, to find the most appropriate harvest period. A comprehensive analysis was made on seed maturity, water content, production and vitality changes in artificial conditions, to investigate the effects of nitrogen fertilization and appropriate harvest time on seed yield and seed quality to provide a scientific basis for grass-seed production and management. A nitrogen application rate of 250 kg/ha was best for Tibetan wild E. nutans’ seeds: seed tiller numbers of 1 816.3/m² could be achieved. This was followed by nitrogen applications of 210 or 290 kg/ha, which achieved tiller numbers of 1 565.0/m² and 1 508.2/m² respectively. Seed production of 2 016.5 kg/ha may be achievable . The best time for seed harvest is 28-31 d in the period of full flowering stage, when seed water content has dropped to 42%-36.59%, and the seed dry weight and seed yield are close to the maximum value.

CLC Number:

XIE Guo-ping, HU Tian-ming, WANG Quan-zhen, MIAO Yan-jun,
Bianbadroma, ZHU Yong, XIONG Xiao-rui. A study on the impact of nitrogen application and harvest time on theseed yield of Tibetan wild Elymus nutans in Lhasa valley, Tibet[J]. Acta Prataculturae Sinica, 2010, 19(2): 89-96.

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