ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01487.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01488.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

AbstractThe history and development of the multiple‐probe capacitance meter used forin situ, non‐destructive estimations of herbage mass is reviewed. An elementary, semi‐theoretical electric‐field analysis focuses attention on the inherent difficulties associated with the multiple‐probe approach. This report establishes the background for the introduction of an ‘earth‐plate’ c

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01489.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

AbstractStudies have been carried out to measure the response to selection for canopy characters, as measured on young spaced plants, and the associated changes in sward yield inLolium.In addition certain of the selection lines were compared with and found to be more productive than several existing bred varieties, indicating the considerable scope for improvement of dry matter yield through breeding.The canopy characters which were associated with high yield are compared with those which confer high yielding ability on a spaced plant and an individual in a community. The plant breeding implications of the results are briefly discussed.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01490.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

AbstractA series of preliminary trials is described to assess the potential and some of the cultural requirements of new cultivars of forage peas grown as pure stands in the west of Scotland. Optimum sowing date was late March for harvesting 15 weeks later to leave sufficient of the growing season for a catch crop or the establishment of a grass sward. Yield of dry matter (DM) at harvest was approximately 6 t ha‐1but DM concentration varied greatly with season. The digestibility of the organic matter was of the order of 0·700 and the crude protein concentration in the DM 170 g kg‐1. DM yield increased with increasing seed rate up to 200 kg ha‐1the maximum rate

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01491.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

AbstractEstimates of the total acidity of silage effluent from a range of first‐cut silages varied from 1025 to 21,125 mg Ca CO3per l with a weighted mean of 8817 mg l‐1. Quick‐lime (CaO), hydrated lime [Ca(OH)2] or caustic soda (NaOH) were found to be effective neutralizing agents when thoroughly mixed with the effluent. Results from seven field‐plot experiments carried out between 1973 and 1977 involving application of silage effluent to grass swards are reported. Leaf scorch occurred when silage effluent with a total acidity equivalent to more than 6000 mg CaCO3per l was applied at rates exceeding 50 m3ha‐1to swards with several weeks regrowth. Scorch was most severe when applications were made during periods of dry sunny weather and to mechanically damaged swards. In these conditions reducing the total acidity to below 2000 mg CaCO3per l by neutralization or dilution allowed rates of over 100 m3ha‐1to be applied without harmful effects.Acid neutralization was found to be unnecessary when silage effluent was applied to recently cut swards. Here rates of up to 150 m3ha‐1were applied without adverse effects and generally resulted in increased

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01492.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

AbstractThousand‐seed weight, germination and seedling dry weight were measured in some tetraploid hybrid ryegrasses to study variations in seed quality. In cv. Sabrina, seed from spaced plants had a higher 1000‐seed weight and seedling dry weight, and a slower germination rate than seed from narrow drills. Seed from later emerging groups of inflorescences had a low 1000‐seed weight and seedling dry weight, but a high germination rate. Seeds of cv. Sabrina, Leri and Augusta harvested at between 10 and 25 d after peak anthesis had low 1000‐seed weights, low germination rates and low seedling dry weights. Air temperatures between inflorescence emergence and seed maturity also affected seed quality; an increase in temperature from a 15°/10°C regime to a constant 25°C environment reduced 1000‐seed weight and seedling dry weight, but increased germination rate. It is concluded that year‐to‐year variation in seed characters will occur because of temperature and other climatic changes, but seed quality can also be influenced by the time at which the seed is harvested. If combine harvesting is carried out at a moisture concentration of about 400 g kg‐1(≡40%) then maximum yields of seed of a high qualit

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01493.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01494.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Book review in this articleChanges in Sward Composition and ProductivityEdited by A. H. Charles and R. J. Haggar.Science and Hill FarmingTwenty five years of work at the Hill Farming Research Organisation 1954–1979By various authors Hill Farming Research OrganisationGrassland Farmers in England and WalesBy Gwyn E. JonesSystems Simulation in AgricultureBy J. B. Dent and M. J. BlackieIntroduction to the Principles and Practice of Soil ScienceBy R. E. WhiteSilage(Tenth edition)Bulletin 37, Ministry of Agriculture, Fisheries and Fo

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01495.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1980.tb01496.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY