Understanding the agronomic impacts of defoliation strategies in“Bulldog 805”Alfalfa+“Tifton 85”bermudagrass mixed stands  

作　　者：Lisa L.Baxter Justin C.Burt Mary Kimberly Mullenix Sydney L.Payne Kaylyn R.Reagin Katie M.Mason Chris G.Prevatt Jennifer J.Tucker 

机构地区：[1]Department of Crop and Soil Science,University of Georgia,Tifton,Georgia,USA [2]Department of Animal Science,Auburn University,Auburn,Alabama,USA [3]Department of Animal Science,University of Tennessee,Knoxville,Tennessee,USA [4]Beef Cattle and Forage Commodity Director,Alabama Farmers Federation Montgomery,Montgomery,Alabama,USA [5]Department of Animal and Dairy Science,University of Georgia,Tifton,Georgia,USA

出　　处：《Grassland Research》2023年第4期251-259,共9页草地研究（英文）

基　　金：National Institute of Food and Agriculture,Grant/Award Number:2017-70005-27089。

摘　　要：Background:The incorporation of legumes,specifically alfalfa(Medicago sativa L.),into bermudagrass(Cynodon spp.)-based pasture systems in the southeastern United States has increased in recent years as an alternative to synthetic nitrogen(N)fertilization.Methods:A small plot evaluation was conducted in Shorter,Alabama,and Tifton,Georgia,USA,to evaluate the impact of harvest height(HH)and harvest frequency(HF)on agronomic characteristics of alfalfa+bermudagrass mixtures in southeastern United States.Results:Results from both locations revealed that the longer the HF and the shorter the HH,the greater the alfalfa retention was in the stand(p<0.01).HH did not impact any of the reported nutritive value parameters,while longer HF resulted in lower total digestible nutrients,lower crude protein,higher acid detergent fiber,and lower 48 h in vitro dry matter digestibility(p<0.01).Both HH and HF impacted forage accumulation at both locations(p<0.01).HH resulted in different trends at each location,while longer frequencies generally increased forage accumulation.Conclusions:This research confirmed recent findings from comparable evaluations in the southeastern United States,in that increasing HH and decreasing HF improved alfalfa retention while having a negligible effect on nutritive value or forage accumulation.

关 键 词：alfalfa+bermudagrass mixtures defoliation management forage management 

分 类 号：S718.5[农业科学—林学]