摘要:

This is a preliminary report on an instrument being developed for the measurement of pasture yieldin situ. In essence the instrument is an electrical capacitance measuring unit in which the introduction of herbage to a measuring head causes a change in the electrical capacitance of the system. This capacitance change is measured at a radio frequency and used as an indicator of the mass of herbage contained within the measuring head.The development and construction of the instrument is described and data are presented for 15 calibration series in which frequency change has been related to pasture yield.Within series the instrument accounts for approximately 90% of the variation in pasture sample yield measured either as wet, dry or organic matter. However, significant differences exist between series. These differences would give rise to bias if pasture yield were estimated from a prediction equation derived from the pooled data.Possible sources of the differences between series are discussed and avenues for further development indicated.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00276.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

3‐inch sheep shears powered by various motors have been used extensively for sampling in grazing experiments at Hurley since 1958. General observations on their use are made and the results obtained in comparisons of sampling methods made in 1958 and 1959 are discusse

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00277.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

The distinctive vegetation of some anthills in chalk grasslands is shown diagrammatically, and some differences between the soils of anthills and those of the surrounding grasslands are discussed. The termite mounds of the tropics also have soils differing from those of the grasslands in which they are built; some harvester termites destroy areas of pasture: and the large mounds of fungus‐eating termites hinder mechanical cultivation. Temperate and tropical pastures benefit from control of ants and termite

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00278.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

Methods used by growers to establish seed crops of perennial ryegrass, cocksfoot, timothy and meadow fescue have been examined. While satisfactory establishments were obtained by sowing perennial ryegrass broadcast, cocksfoot, timothy and meadow fescue should be sown in rows, especially if they are to be sown under a cover crop.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00279.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

A technique is described for the assessment of white clover populations implanted as rooted cuttings into an uplandFestuca/Agrostissward.Five natural populations of white clover, taken from widely different soils and habitat conditions, were tested by this technique on an acid soil, low in calcium and phosphate and just outside the natural limits of clover distribution.Throughout the experiment, populations from acid upland soils showed a superior performance and a lower percentage mortality than did populations from lowland calcareous soils and from medium‐fertility soil at a very high altitude.After two years, plants of the acidic populations alone remained alive, and of these only 19–25% of the number originally planted.The order of performance in the natural sward was an almost complete reversal of the order of performance as spaced plants on a high‐fertility lowland soil.The results indicate that the differential response to soil fertility factors, previously shown to exist between natural populations of white clover by soil‐ and sand‐culture techniques and by field fertilizer trials of spaced plants, became even more marked when the plants were subject to competition from native species.The possibility of breeding white clover varieties adapted to acid upland conditions is discussed, particularly in relation to compatibility with nativ

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00280.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

Autumn defoliation of the early perennial ryegrass, S24, expedited or delayed heading and increased or decreased the number of heads and seed yield, according to the age of the stand, winter conditions and previous management.Nitrogen applied as late as anthesls significantly increased the seed yield of the first harvest crop, but the after‐effect on the next seed crop was not better than from an application made immediately after the first harvest. One application in spring was more effective than two in the previous summer and autumn.Autumn defoliation influenced seed yield more strongly than the gross weight of the unthreshed crop

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00281.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

The production of six varieties of Italian ryegrass was compared for three years by cutting 5 or 6 times during the growing season. All varieties showed falls in production of dry matter at high and low levels of N fertilization, but New Zealand HI and New Zealand Italian ryegrass showed significantly lower falls and gave top yields over the three years, in spite of severe frost damage in the first two. Crude protein and nitrogen absorption remained high at the lower level of fertilization (174–209 lb N/acre) and showed a fall only in the third year at the high level of N fertilization (348–418 lb N/acre).The significance of the high response of the New Zealand varieties is discus

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00282.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

Grassland recording provides not only a method of measuring output on individual tields but also a means of gaining information about the value of management techniques as they arc applied on the commercial farm, and is helping in the interpretation of the results of field experiments on grassland problems. Responses to nitrogen, phosphate and potash have been demonstrated with the technique.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00283.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00284.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY

摘要:

This report deals with an experiment in which it was possible to follow a crop of grass through from the growing state in the field to its feeding performance as measured by the liveweight gain of bullocks. The objective was to compare what happened according to whether the first growth of the crop was made into silage or into barn‐dried ha

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1962.tb00285.x

出版商:Blackwell Publishing Ltd    

年代:1962

数据来源: WILEY