Effects of seed bed preparation, seed rate and seed covering, and weeding frequency of linseed (Linum usitatissimum L.)
1997
Nigusie Alemayehu | Adefris Teklewold (IAR, Addis Abeba (Ethiopia))
In Ethiopia, linseed is grown under conditions of reduced tillage and without weed control. On farmers' fields, linseed stands are invariably sparse and weak which are believed to emanate partly from sub-optimum seeding rate and inappropriate seed covering methods. Therefore, in order to establish optimum combinations of frequency of ploughing, seeding rate, method of seed covering and frequency of hand weeding, 81 combinations of three levels of each factor were tested in strip-split-plot design with three replications at Holetta Research Center in 1992 and 1993. The treatments of ploughing and covering were assigned to the strip-plots and the complete factorial combinations of seeding rate and weeding to the interaction plots. Oil content was observed to be little of not affected by both main effects and the interactions of the factors considered. When pre-seeding weather in April and May was dry, weed infestation was light. In such weather, a single or two ploughings follwed by well planned two subsequent hand weedings were equally effective to increase seed yield and 100-seed weights as were more frequent operations during wetter conditions of extended rainfall. Under the latter conditions, better seed yield advantages could be secured from the higher seed rate of 40 kg/ha; 30 kg/ha is optimum otherwise. Covering linseed with thin layer of surface soil (3-5 cm) using the "Ardu-Harrow" resulted in best seed yield and stand establishment but had variable effects on the other characters. Covering with the local plough was invariably accompanied with poor performance of the crop.
Mostrar más [+] Menos [-]Palabras clave de AGROVOC
Información bibliográfica
Este registro bibliográfico ha sido proporcionado por Ethiopian Institute of Agricultural Research