Changes in the Weed Flora on Broadbalk Permanent Wheat Field During the Period 1930-55
1958; Wiley; Volume: 46; Issue: 1 Linguagem: Inglês
10.2307/2256906
ISSN1365-2745
Autores Tópico(s)Mediterranean and Iberian flora and fauna
ResumoWeeds have always been a serious problem on Brbadbalk permanent wheat field at Rothamsted, as continuous autumn sowing allows no adequate interval for cleaning between successive crops. Partial fallowing of the field has been resorted to on more than one occasion, the most comprehensive scheme being carried out from 1926-29. The field was then divided into five transverse sections (the manurial treatments running lengthways), two of which were fallowed during the seasons 1926 and 1927, two during 1928 and 1929, while the fifth section was left uncropped for the whole four-year period. In 1931, a five-year cycle was started in which each of the five sections was fallowed in turn for a single season. Four of these cycles have been completed and it is now possible to assess the value of this procedure in controlling the weeds. The effect of the 1926-29 fallowing scheme and the first two of the five-year cycles on a limited number of plots have already been discussed (Brenchley & Warington 1930, 1933, 1936 and 1945). The present paper describes the results from the same plots after a further five-year cycle and also reviews the changes in the weed flora that have taken place over the whole field from 1930-55, based on visual rating. Earlier changes have been described by Warington (1924). A plan of the field with manurial and cultural treatments is given in Fig. 1. The system of nomenclature used is that of Clapham, Tutin & Warburg (1952). In the earlier publications the classification followed was that of Bentham & Hooker, British Flora, 1912. The changes involved are as follows: Clapham, Tutin & Warburg Bentham & Hooker Alopercurus myosuroides Alopecurus agrestis Aphanes arvensis Alchemilla arvensis Arrhenatherum elatius Arrhenatherum avenaceum Chaenorrhinum minus Linaria minor Knautia arvensis Scabiosa arvensis Odontites verna Bartsia odontites Specularia hybrida Legousia hybrida Taraxacum officinale Taraxacum dens-leonis Torilis arvensis Caucalis arvensis Valerianella locusta Valerianella olitoria Veronica hederifolia Veronica hederaefolia Veronica persica Veronica buxbaurnii
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