{"title":"蒂莫西草和草甸羊茅在5个物候阶段的再生速率","authors":"H. Bonesmo, A. Skjelvåg","doi":"10.1080/713782028","DOIUrl":null,"url":null,"abstract":"The relationship between phenological stage at the first cut and subsequent regrowth rates was studied in six field experiments with timothy (Phleum pratense L.) and meadow fescue (Festuca pratensis Huds.) under two levels of N application. The field sites were selected to cover a wide range of climatic conditions in Norway. Five weekly yield samplings during the regrowth periods were fitted to an expolinear growth equation to determine initial maximum relative regrowth rates (R m) and maximum regrowth rates (C m). The step from actual to potential rates was accomplished by weighting the obtained rates with a weather index. For both species R m was highest after an initial cut at the early vegetative stage. It was reduced by 50% at jointing, after which there was no change with later cuts. For both species the C m declined sharply with cutting time through the early stages of phenological development, whereas from early heading to anthesis there was no significant change. Compared with timothy, the C m va...","PeriodicalId":40817,"journal":{"name":"Acta Agriculturae Scandinavica Section B-Soil and Plant Science","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"18","resultStr":"{\"title\":\"Regrowth Rates of Timothy and Meadow Fescue Cut at Five Phenological Stages\",\"authors\":\"H. Bonesmo, A. Skjelvåg\",\"doi\":\"10.1080/713782028\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The relationship between phenological stage at the first cut and subsequent regrowth rates was studied in six field experiments with timothy (Phleum pratense L.) and meadow fescue (Festuca pratensis Huds.) under two levels of N application. The field sites were selected to cover a wide range of climatic conditions in Norway. Five weekly yield samplings during the regrowth periods were fitted to an expolinear growth equation to determine initial maximum relative regrowth rates (R m) and maximum regrowth rates (C m). The step from actual to potential rates was accomplished by weighting the obtained rates with a weather index. For both species R m was highest after an initial cut at the early vegetative stage. It was reduced by 50% at jointing, after which there was no change with later cuts. For both species the C m declined sharply with cutting time through the early stages of phenological development, whereas from early heading to anthesis there was no significant change. Compared with timothy, the C m va...\",\"PeriodicalId\":40817,\"journal\":{\"name\":\"Acta Agriculturae Scandinavica Section B-Soil and Plant Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.7000,\"publicationDate\":\"1999-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"18\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Acta Agriculturae Scandinavica Section B-Soil and Plant Science\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://doi.org/10.1080/713782028\",\"RegionNum\":4,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"AGRONOMY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Agriculturae Scandinavica Section B-Soil and Plant Science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1080/713782028","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"AGRONOMY","Score":null,"Total":0}
Regrowth Rates of Timothy and Meadow Fescue Cut at Five Phenological Stages
The relationship between phenological stage at the first cut and subsequent regrowth rates was studied in six field experiments with timothy (Phleum pratense L.) and meadow fescue (Festuca pratensis Huds.) under two levels of N application. The field sites were selected to cover a wide range of climatic conditions in Norway. Five weekly yield samplings during the regrowth periods were fitted to an expolinear growth equation to determine initial maximum relative regrowth rates (R m) and maximum regrowth rates (C m). The step from actual to potential rates was accomplished by weighting the obtained rates with a weather index. For both species R m was highest after an initial cut at the early vegetative stage. It was reduced by 50% at jointing, after which there was no change with later cuts. For both species the C m declined sharply with cutting time through the early stages of phenological development, whereas from early heading to anthesis there was no significant change. Compared with timothy, the C m va...
期刊介绍:
Acta Agriculturæ Scandinavica Section B publishes original research in applied soil and plant science with special attention given to to crop production in agri- and horticultural systems. We welcome manuscripts dealing with:
Climate smart and sustainable crop production systems
Water and nutrient efficiency
Soil conservation and productivity
Precise agriculture systems
Applications of bio- and nanotechnology
Digitalisation and robotics
Soil-plant interactions
Acta Agriculturæ Scandinavica, Section B – Soil & Plant Science forms part of a series of titles published on behalf of the Nordic Association of Agricultural Science (NJF). The series also includes Section A - Animal Science .