Fall dormancy (FD) is one of the most important traits in alfalfa (Medicago sativa L.) crop grown in northern climates. Dry matter production data of varieties with different FD levels are needed for predicting the yi...
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Fall dormancy (FD) is one of the most important traits in alfalfa (Medicago sativa L.) crop grown in northern climates. Dry matter production data of varieties with different FD levels are needed for predicting the yield *** research was undertaken to identify and compare variability in dry matter (DM) yields of 42 alfalfa varieties with FD classes ranging from 2 to 9 in Zhengzhou,Henan Province,*** study was conducted for four years with five cuts per *** results showed that the dormant (class 2) and the semidormant varieties (class 4) produced the greatest DM yield,which were significantly greater than nondormant varieties of FD classes ***,DM yields among dormant and semidormant varieties of FD classes 2 to 6 were not different,so did among classes 3,5,6,7,8,*** negative correlation was between FD classes and DM yields,but their correlation was not significant,which correlation coefficient was -0.097,suggesting that the FD should not be used as main index in Zhengzhou introducing variety *** in DM yields among the varieties with identical FD class indicate the possibility in selecting varieties with both great yields and suitable FD *** this study,the best varieties were"Runner"(class 2),"Alfaking"(class 3),"WL-323ML"(class 4),"Goldenkey",and"CW680"(class 6),with average annual DM yields ranged from 22 to 24 t ha-1.(3)For all varieties,DM yield for the first cut was the highest,reduced gradually for the subsequent cuts,and was the lowest for the final cut each year,indicating larger influence of growing seasons than of the FD *** data suggest that in order to increase DM yield,best management practices should be focused on the spring and early summer.
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