The influence of stands cultivation on persistency of different cultivars of Medicago sativa
2003
Santrucek, J. | Svobodova, M. | Hlavickova, D. (Ceska Zemedelska Univ., Prague (Czech Republic))
A polyfactorial field trial with alfalfa (Medicago sativa) cv. Palava, Jarka and Vlasta was established in Cerveny Ujezd (Czech Republic, altitude 405 m a.s.l., average year precipitation 493 mm per year, average year temperature 7.6 deg C, clay loam orthic luvisol). The plants were grown in the spring with a companion crop (spring wheat) in rows spaced 125 mm apart (sowing rate 16 kg/ha). The stands were cut 3 times per year, cultivated with a spike or a vibration harrow before the beginning of the vegetation season and after the first cut. The numbers of plants and stems per m2 and dry mass yields were measured. In comparison with untreated control, the harrowing of the stands resulted in a significantly lower amount of plants per m2 at the end of the fourth year by 23-29 %, and a lower number of stems per m2 (by about 13 % using vibration harrow twice a year). The dry mass yield was significantly influenced only in the variety Jarka (by 5-11 % higher in the cultivated fields). A moderately or relatively strong exponential relationship between the plants amount and the time was observed.
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