K. Tozer, G. Douglas, Emma Noakes, R. Greenfield, C. Cameron
{"title":"Tagasaste silvopastures in steep-hill country. 1. Tagasaste edible dry-matter production and nutritive value","authors":"K. Tozer, G. Douglas, Emma Noakes, R. Greenfield, C. Cameron","doi":"10.1071/CP22221","DOIUrl":null,"url":null,"abstract":"ABSTRACT Context. Tagasaste (Cytisus proliferus) has potential to supplement pasture production in steep-hill country and increase pasture resilience. Aims. To (1) quantify production of edible dry matter (EDM) of pruned 2-year-old tagasaste shrubs and branches from unpruned 10-year-old tagasaste trees, and (2) determine the effect of proximity of the 10-year-old tagasaste trees on selected pasture species established as spaced transplants. Methods. A site was established on the eastern coast of the North Island of New Zealand on steep-hill country (>20° slope). Tagasaste and pasture species production was measured over 3 years. Results. Tagasaste shrubs produced an average of 2.7 kg EDM shrub−1 year−1 and a tree branch produced 129 g EDM year−1. The metabolisable energy content of tagasaste branches averaged 10.0 MJ kg EDM−1, the crude protein content ranged from 18% to 27% and neutral detergent fibre content averaged 39%. Branch diameter and length were poor predictors of EDM branch−1. There was no effect of increasing proximity to tagasaste on DM production of the resident pasture. Effects of increasing proximity to tagasaste on the growth and survival of selected pasture species are reported in a companion paper. Conclusions. Edible-DM production was much greater from shrubs than tree branches and it was not possible to predict branch EDM from branch diameter or length. Implications. A tagasaste silvopasture is likely to be more productive if tagasaste is managed for grazing in situ than if using mature trees for harvesting of branches for browse.","PeriodicalId":51237,"journal":{"name":"Crop & Pasture Science","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crop & Pasture Science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1071/CP22221","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"AGRICULTURE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
ABSTRACT Context. Tagasaste (Cytisus proliferus) has potential to supplement pasture production in steep-hill country and increase pasture resilience. Aims. To (1) quantify production of edible dry matter (EDM) of pruned 2-year-old tagasaste shrubs and branches from unpruned 10-year-old tagasaste trees, and (2) determine the effect of proximity of the 10-year-old tagasaste trees on selected pasture species established as spaced transplants. Methods. A site was established on the eastern coast of the North Island of New Zealand on steep-hill country (>20° slope). Tagasaste and pasture species production was measured over 3 years. Results. Tagasaste shrubs produced an average of 2.7 kg EDM shrub−1 year−1 and a tree branch produced 129 g EDM year−1. The metabolisable energy content of tagasaste branches averaged 10.0 MJ kg EDM−1, the crude protein content ranged from 18% to 27% and neutral detergent fibre content averaged 39%. Branch diameter and length were poor predictors of EDM branch−1. There was no effect of increasing proximity to tagasaste on DM production of the resident pasture. Effects of increasing proximity to tagasaste on the growth and survival of selected pasture species are reported in a companion paper. Conclusions. Edible-DM production was much greater from shrubs than tree branches and it was not possible to predict branch EDM from branch diameter or length. Implications. A tagasaste silvopasture is likely to be more productive if tagasaste is managed for grazing in situ than if using mature trees for harvesting of branches for browse.
摘要上下文。Tagasaste(Cytisus proliferus)有潜力补充陡坡地区的牧场生产,提高牧场的恢复力。目标。(1)量化修剪后的2年生田甘树灌木和未修剪的10年生田甘树的枝条的可食用干物质(EDM)的产生,以及(2)确定10年生田甘树的接近度对作为间隔移植建立的选定牧场物种的影响。方法。在新西兰北岛在……的东海岸陡峭的山坡上(>20°斜坡)建立了一个场地。Tagasaste和牧场物种产量在3年内进行了测量。后果Tagasaste灌木每年平均产生2.7公斤EDM灌木,树枝每年产生129克EDM。tagasaste枝条的代谢能含量平均为10.0MJ kg EDM−1,粗蛋白含量在18%至27%之间,中性洗涤剂纤维含量平均为39%。分支直径和长度是EDM分支-1的较差预测因子。增加与塔加斯特的接近度对常驻牧场的DM产量没有影响。在一篇配套论文中报道了越来越接近塔加斯特对选定牧场物种生长和存活的影响。结论。灌木的可食用DM产量远高于树枝,并且无法从树枝直径或长度预测树枝EDM。含义。如果塔加斯特在原地放牧,那么塔加斯特森林牧场的生产力可能比使用成熟树木收割树枝进行浏览更高。
期刊介绍:
Crop and Pasture Science (formerly known as Australian Journal of Agricultural Research) is an international journal publishing outcomes of strategic research in crop and pasture sciences and the sustainability of farming systems. The primary focus is broad-scale cereals, grain legumes, oilseeds and pastures. Articles are encouraged that advance understanding in plant-based agricultural systems through the use of well-defined and original aims designed to test a hypothesis, innovative and rigorous experimental design, and strong interpretation. The journal embraces experimental approaches from molecular level to whole systems, and the research must present novel findings and progress the science of agriculture.
Crop and Pasture Science is read by agricultural scientists and plant biologists, industry, administrators, policy-makers, and others with an interest in the challenges and opportunities facing world agricultural production.
Crop and Pasture Science is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.