摘要:

AbstractMefluidide was applied at 150ga.i.ha−1on one of three dates (7, 28 March or 18 April, 1984) to irrigated field plots of nine grasses. Spraying suppressed flowering in the primary growth of most species, especially when carried out in mid‐ April. However, spraying at this time proved too damaging to amounts of herbage harvested. Spraying in March reduced mean yields by about one‐third at the first harvest and increased mean yields at the second harvest. In addition, spraying at this time increased herbage quality, as indicated by higher N and lower fibre contents, at least at the first harvest. In general, the grasses most responsive to mefluidide were tall‐growing and/or early‐flowering species, e.g.Arrhenatherum elatius, Festuca rubra, Dactylis glomerata and Holcus lanatus; by comparison,Lolium perennewas relatively less affected by spraying. The findings indicate the potential of mefluidide for overcoming the normal decline in herbage quality associated with flowering, and for transferring growth from spring to midsummer, albeit at some cost to total annual p

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1989.tb01913.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractThe phosphorus (P) status of perennial ryegrass was measured using three tissue tests. The results were compared with dry matter (DM) production from ryegrass, and levels of extractable soil P, taken from a fertilized non‐calcareous gley in a field experiment. Large errors were associated with the test values but it was possible to separate P deficiency from luxury uptake with tissue tests for total P and inorganic P (Pi) in leaves. The latter test is simple and merits further investigatio

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1989.tb01914.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractA farm‐scale trial to compare the effectiveness of polythene bags and wrapping of big bale silage was monitored forListeria monocytogenescontamination. There was no significant difference between the level ofL. monocytogenesfound in wrapped and bagged big bale silage, but the work confirmed that big bale silage is prone to contamination by Listeria organisms, and that the degree of Listeria contamination could be significantly reduced by the removal of obviously spoiled material prior to feedin

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1989.tb01915.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractComparative chemical composition,in vitrodigestibility, andin vitrovolatile fatty acid (VFA) concentration and molar proportions of current year's growth of twelve important native New Mexico forage species were evaluated. Volatile fatty acid data were collected on forage samples subjected to 12‐hin vitrodigestion using two different inoculum sources. Forbs and shrubs had higher (P0·05) among grasses forbs and shrubs.in vitroorganic matter digestibility (IVOMD) was higher (PKOOS) for forbs and shrubs than grasses for all incubation periods (24, 48, 72 hours). Lucerne hay and prairie grass hay inocula gave similar IVOMD results. Based on 24‐h IVOMD divided by 72‐h IVOMD, forbs were digested more rapidly than grasses (P<0·05). Total VFA concentration and molar proportion differences among grasses, forbs and shrubs

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1989.tb01916.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractThe hydrogen cyanide potential (HCNp) of 17 cultivars of white clover were compared. With inadequate phosphorus supply, HCNp ranged from 24 mg kg DM−1for cv Lucky to approximately 640 mg kg DM−1for cv Huia and from 6 to 322 mg kg DM−1for the same cultivars, with adequate phosphorus. The four North American cultivars examined had notably lower HCNp than all European or Australasian cultivars except cv Cla

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1989.tb01917.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractA field experiment was established in May 1986 in which four white‐clover populations originating in Switzerland, and a bred variety, Menna, were grown in binary mixtures with their ‘co‐existing’ perennial ryegrasses and three other bred ryegrasses— Aurora, Talbot and Melle. The productivity of both components of the mixtures was measured by cutting samples in October 1986 (after establishment) and on five occasions during the growing season in 1987, Substantial differences were observed between clover yields in different mixtures, and the yield ranking of clover was found to vary with companion grass. It was concluded that the interaction between grass and clover populations originated at an early stage in sward development, being evident in both the 1986 establishment cut and the spring cut of the following year. The implications of these results for the formulation of breeding objectives and the evaluation of breeding material are briefly

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1989.tb01918.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY