Browsing by Person "Weik, Lena"

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Ertragsbildung und Konkurrenzverhalten perennierender Körnerfruchtarten in Rein- und Mischbeständen auf marginalen Standorten
(2002) Weik, Lena; Aufhammer, Walter
Cultivation of perennial grain crops in pure and mixed stands was examined as a possibility for preserving marginal arable land. The following questions were investigated: - Which dry matter and grain yield potential do these species display on marginal lands? - Are the examined species able to persist on marginal sites? - Can effects of competition be identified in mixed stands of perennial grain crops by commonly used static and dynamic parameters? - Which competitiveness do the examined species show in mixed stands compared to pure stands? In field experiments perennial species of rye (Secale cereale x S. montanum), intermediate wheatgrass (Elymus hispidus), lupine (Lupinus polyphyllus) and linseed (Linum perenne) were grown in pure and different mixed stands. Intermediate wheatgrass reached with a maximum at almost 13 t ha-1 highest dry matter yields. Grain yields were on a low level, maximum yields were obtained with 2.7 t ha-1 in pure stands of rye. Intermediate wheatgrass and lupine demonstrated the best ability for perennialism. Rye showed a satisfactory ability to persist only when grown in mixture with legumes. The persistence of linseed was very low. The relative yield total (RYT) was found to be a suitable static indicator of resource complementarity. Competitive ability was appropriately described by the competitive balance index (Cb). Regression models derived from Lotka-Volterra equations rendered a good description of dynamic growth and competition. Both grass species were in most cases stronger competitors than the companion species. The experiments showed, that using grain cop mixtures of grasses and legumes seem to be most promising for cultivation on marginal lands.