ISSN:
1365-2494
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
A trial is described which was designed to test the hypothesis that measurements taken of the leaf-plus-shoot length of spaced plants may give a good indication of dry-matter yield of strains of Dactylis glomerata, as determined by cutting and weighing the produce of sward plots.Two contrasting strains of Dactylis glomerata were used: the British S.143, and the German von Kamekes. The strains were established during 1955 both as spaced plants (10 plants per plot) and as pure swards, with six replications of each. The two methods of establishment formed the main treatments, occupying whole plots, and each plot was divided into four sub-plots each of which carried one of the combinations of the two strains with the following two management treatments: Treatment 1, cut at monthly intervals from 27 April to 23 August; Treatment 2, cut on 12 April and subsequently at the mean date of emergence of the inflorescence for each strain, followed by cutting at monthly intervals until the end of August.Spaced plants were measured before cutting by thrusting a measuring rod into the crown of the plant and measuring the leaf-plus-shoot length of one of the longer shoots. Produce cut from sward plots was weighed and sampled for dry-matter content.Results from the swards showed that von Kamekes produced more dry matter in early spring, but that subsequently the advantage passed to S.143.Significant positive correlations were obtained in early spring between the sward yields and leaf-plus-shoot measurements from spaced plants. Subsequently there was no agreement between the two methods, and some significant negative correlations were obtained.The data are discussed in relation to the physiological stages of development of the strains, which suggests that:〈list xml:id="l1" style="custom"〉(a) In the spring period the main factor contributing to yield was shoot elongation, with the majority of the tillers in the reproductive phase.(b) In summer the main factor was new tiller formation, with the majority of tillers in the vegetative phase.(c) In the early autumn neither factor was dominant and both contributed to yield.Attention is drawn to the danger of comparing yields from spaced plants with yields from swards where the management may influence the results obtained, and to the difficulty of assessing hay yields by means of height measurements of spaced plants.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2494.1958.tb00118.x
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