Effect of variety and fertility period on production performance,nutritional quality,and mineral elements of alfalfa
The experiment was to analyze the effects of variety and fertility period on the production performance,nutritional quality,and mineral elements of alfalfa.The experiment was conducted to determine the high-yielding and high-quality alfalfa varieties and the optimum fertility period in Chifeng area.Seven introduced varieties of alfalfa were used as study materials to compare the differences in production performance and nutritional quality among the seven varieties at the present bud stage,early flowering stage and full flowering stages.The results showed that the plant height showed an increasing trend with advancing fertility,and was significantly higher at the full flowering stage than at the bud stage and early flowering stage(P＜0.05).Higher hay yields were obtained at the early flowering stage of WL168 and Golden Queen.Crude protein(CP),extract ether(EE),crude ash(Ash),and total digestible nutrients(TDN)contents showed a decreasing trend with advancing fertility.Except for the Algonquin and Hunter River varieties,CP content was significantly higher at the present bud stage and early flowering stage than at the full flowering stage(P＜0.05).Whereas neutral detergent fiber(NDF),acid detergent fiber(ADF),acid detergent lignin(ADL)content,and relative feeding value(RFV)increased with advancing fertility,NDF and ADF content of 54V09 was lower than those of the other varieties,and RFV of 54V09 varieties at the time of early flowering stage was significantly higher than all varieties except 55V12(P＜0.05).As the fertility period progressed,all mineral elements showed a decreasing trend.The concentrations of Ca,Mg,S,P,and K elements were significantly higher at the bud stage than full flowering stage(P＜0.05).At the bud stage,54V09 variety had the highest content of Ca,Mg,and S elements,while 55V12 variety had the highest content of P and K elements.By analyzing the mean values of each index of seven varieties in three fertility periods and using the affiliation function method for comprehensive evaluation,it was concluded that the best quality was obtained at the bud stage.The nutritional quality of different alfalfa varieties ranked in the following order:54V09＞55V12＞WL168＞Sandri=Hunter River＞Golden Queen=Argangjin.The study indicates that in Chifeng Arukolqin area,harvesting at the bud stage can obtain high yield and high quality forage,while the 54V09 and 55V12 varieties are suitable for popularization of planting in Chifeng area.
alfalfavarietyfertility periodproduction performancenutritional qualitymineral elements
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