Productivity and persistence of alfalfa and goat's rue
2001
Lillak, R. | Laidna, T. | Linke, A. (Estonian Agricultural Univ., Tartu (Estonia). Dept. of Grassland Science and Botany)
Deep depression in agricultural sphere from the beginning of nineties make forage legumes very attractive to Estonian farmers. High productivity, excellent quality, good adaptation and high symbiotic dinitrogen fixation ability as well as many other credits with increasing interest provide for growing of alfalfa and goats rue. However, sensitiveness to biotic and physical stress connected with mistakes often done by predicting the optimum management system of stands, is a main factor still limiting expansion of these species. Results of our investigations indicate a significant correlations between productivity and persistence of alfalfa and goat's rue, and cutting intensity, date of the last cut, satnd aging, location and cultivar characteristics. The highest alfalfa DM yield was obtained if winter-hardy foreign varieties with high recovery ability were seeded on a high fertile calcium-rich soiltype and comparatively extensive 2-cut harvesting schedule was used in the next period. The most productive was alfalfa in the second-third productive year. Changing the cutting system to 3-cut harvesting schedule was resulted reduction in productivity of alfalfa up to 21 per cent. Final cutting at least 40 days after previous harvest allowed to minimize the persistence risk. Galega orientalis was lazy developing after seeding forage legume achieved the highest DM yield from the seventh year of stand development in Tartu pedoclimatic conditions. Harvested twice in the season and deleted the final cut to the late September or early October goat's rue significantly surprassed alfalfa in yield and persistence. Harvested 3 times per season was resulted with strong depression in productivity and persistence of goat's rue
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