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Qinghai University (2020)

Response to Water-saving Irrigation Period in Different Forage Mixing Modes in Alpine Arid Area

马利利

Titre : Response to Water-saving Irrigation Period in Different Forage Mixing Modes in Alpine Arid Area

Auteur : 马利利

Grade : Master’s Theses 2020

Université : Qinghai University

Résumé partiel
Aiming at the problems of insufficient rainfall and low water use efficiency of Artificial Forage in Alpine desert area,the field experiments were carried out in Jintai pasture of Wulan County,Qinghai Province in 2018 and 2019 with oats,arrow peas,quinoa and vetch as the research objects.In 2018,three water treatments were set up : no irrigation in the whole growth period,water saving by irrigation and pulling(25 mm),irrigation and pulling and two water for flowering(25 mm + 25 mm),two mixed planting modes : oats and arrow peas,quinoa and hairy vetch.Based on the mixed sowing of quinoa and vetch in 2018,two growth stages of branching stage and flowering stage are selected in 2019,and three water control gradients are set : medium deficit : soil moisture content of 45%-55% FC,slight deficit : soil moisture content of 55%-65% FC,full irrigation : soil moisture content of 65%-75% FC,with no irrigation in the whole growth period as the control.The effects of irrigation on the yield,water use efficiency,feeding value and soil environment of forage grass mixture were studied.The comprehensive analysis method was used to analyze the effect of irrigation on forage grass mixture,and the optimal irrigation treatment was obtained.The main conclusions are as follows:1.The yield of the mixture of oats,arrow peas,quinoa and hairy vetch increased with the increase of irrigation,and reached the maximum of 21909.38 kg/hm2 and 14432.50 kg/hm2 under the treatment of irrigation,drawing and flowering water,respectively.Compared with CK,the increase of water use efficiency was 58.97% and 26.34%,and the highest water use efficiency was 3.47 kg/m3 and 2.42 kg/m3 without irrigation.Under the condition of regulated deficit irrigation,the yield of the mixture of quinoa and hairy vetch increased in different degrees.The highest yield was 11030.48kg/hm2,the highest yield was 56.13%,and the highest water use efficiency was 2.51kg/m3 at branching stage and flowering stage.2.The content of acid washing fiber(ADF)and neutral washing fiber(NDF)decreased with the decrease of irrigation,the lowest was 23.13% and 48.57% in CK without irrigation,the content of crude protein and relative feeding value(RFV)increased with the decrease of irrigation,the highest was 10.59% and 9.63% in CK without irrigation,and RFV was 136 67%。

Mots clés : irrigation ;mixed sowing ;yield;feeding value ;soil environment ;optimal irrigation treatment ;

Présentation (CNKI)

Page publiée le 31 mars 2022