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Trefoil seed yield in relation with the time of 1st hay harvest

, : Trefoil seed yield in relation with the time of 1st hay harvest. Rasteniev"dni Nauki 16(5): 78-84

A field trial was performed in 1970-1973 to establish the optimal date of the 1st trefoil green mass harvest in order that higher seed yield can be produced by the 2nd undergrowth. The following treatments were included: mowing before budding when plant height is 30-35 cm; mowing at the time of budding; mowing at the time of single flower anthesis; mowing at the time of beginning of anthesis (10%); mowing at the time of mass anthesis (50%). Duration of growth and development of the 2nd trefoil undergrowth left for seed production and, particularly, duration of the phases anthesis and seed formation and ripening can be successfully regulated by the time of 1st undergrowth mowing. Most suitable time for the 1st undergrowth harvest is at the phase beginning to mass anthesis. When mowing takes place at that time, best conditions are ensured for anthesis and seed formation of the 2nd undergrowth. Early mowing of the 1st undergrowth reduces seed production of the 2nd one. Following 1st trefoil hay mowing at the time of beginning to mass anthesis, the harvest of the 2nd undergrowth must be performed when 75-80% of the pods are either ripe or semi-ripe.

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