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Lanzhou University (2019)

Study on Yield and Water and Nitrogn Utilization of Oat Sole Sowing and Oat/Vetch Mixed Sowing Grassland in Alpine Arid Area


Titre : Study on Yield and Water and Nitrogn Utilization of Oat Sole Sowing and Oat/Vetch Mixed Sowing Grassland in Alpine Arid Area

Auteur : 张学梅;

Grade : Master’s Theses 2019

Université : Lanzhou University

In the desert grassland region of Qinghai-Tibet Plateau,the rainfall was limited and the grassland production and stocking rate are in a relatively low level.Therefore,it is of great of importance to improve agricultural management measures,make full use of natural resources by establishing artificial grassland to promote the development of local livestock production.The objective of this study was to optimize the utilization efficiency of water and nitrogen,a high-yield cultivated grassland management mode in the desert region of the Qinghai-Tibet Plateau was proposed by determining the dry matter yield and crude protein production of artificial grassland and water and nitrogen use efficiency to planting pattern and fertilization level and irrigation mode.The field experiment was conducted in 2017 and 2018 at Jintai Pasture of Wulan county,Qinghai province,which was completely randomized block designed.Two planting patterns were included in the field experiment and which named sole oat P1 and oat/common vetch mixed sowing P2 ;and establishing two nitrogen fertilization treatments were low level N1(60 kg·N·hm-2)and high level N2(120 kg·N·hm-2),respectively.Irrigated respectively by 4 irrigation mode,which was fully irrigated FI(50 mm at tillering stage,jointing stage and flowering stage),stress at reproductive stage RS(50 mm at tillering stage and jointing stage respectively),stress at vegetative stage VS(50 mm at flowering stage of oats)and non-irrigated DL.The main results obtained are showed as below :(1)The dry matter yield(DM)could be greatly improved by mixed sowing and increase application fertilization under rain-fed region.Compared with the low-fertilizer treatment,the DM of high-fertilizer treatment at harvest increased by34.7%,9.7%,in 2017 and 2018 respectively.and the crude protein production(CP)increased by41.3%and 20.4%,respectively.Under the mixed sowing treatment,the DM increased by 14.4%and 9.2%and the CP increased by 74.7%and 62.9%compared to the low-fertilizer treatment in 2017 and 2018,respectively.The DM and CP of the P2N2 treatment were the highest among all treatments.In 2017,the DM and CP at the harvest were 10.3 t hm-2 and 827.2 kg hm-2 respectively and 7.6 t hm-22 and 570.2 kg hm-2 in 2018,respectively.(2)Both the water consumption(WU)and water use efficiency(WUE)of the grassland were enhanced with the increase application of fertilizer under the rain-fed condition.The WU of high-fertilizer treatment was 6.2%and 4.3%higher than that of low-fertilizer treatment in 2017 and 2018,respectively,and the WUE of dry matter(WUEDM)was increased by 21.0%and 4.9%at harvest in 2017 and 2018,respectively,the WUE of crude protein(WUECP)was increased by 30.1%and 17.4%in 2017 and2018,respectively.The WU of the grassland also increased under the mixed sowing treatment with no significant effect on the WUEDM.but the WUECP was also greatly improved.The WU of grassland under the mixed sowing increased by 17.9%and 9.2%in 2017 and 2018,respectively,and the WUECP increased by 46.7%and 51.3%compared with sole oat

Mots clés : Alpine area; cultivated grassland; forage yield; crude protein yield; water use efficiency; nitrogen use efficiency;

Présentation (CNKI)

Page publiée le 18 mai 2020