Relative Importance of Some Managment Factors in Seed and Oil yields of Ethiopian Mustard (Brassica carianta Braun.) and Rapeseed (b. napus L.).
1994
Nigussie Alemayehu and Mesfin Abebe
Employing the full packages of agronomic practices in producing Ethiopian mustard (Brassica carinata) and rapeseed (B.napus) has long been proved profitable. However, the small farmers can neither adopt the package in its entirety because of resource limitations nor do they give priorities to the most limiting components of the package because the information is virtually absent. Therefore, this experiment was undertaken to address this information gap using 32 combinations of five factors each at two levels, sowing dates (optimum and delayed by one month), methods of sowing (row and broadcasting), fertilizer (N and P optimum and nil levels), weed control (hand weeding once and no-weeding), and varieties ("S-67" representing B.carinata and Tower Sel-e, B.napus). The experiment was conducted at Holetta (38"E and 9°N) and Kulumsa (39"E and 8"N) in 1988 and 1989, in incomplete block design with four replications, on 9 m2 plots. "S-67" outyielded "Tower Sel-e". Conversely, the latter had higher oil content, though its oil yield remained less. At Holetta, fertilizer was the most critical on "Tower Sel-3", followed by early sowing. With "S-67", high oil and seed yields were obtained from either fertilizer or early sowing. At Kulumsa where faster growth and shorter growing period prevail, sowing date was most critical followed by fertilizer for S-67 and both factors with weed control were equally critical for Tower Sel-3. At both locations, broadcasting was good enough and was least critical.
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