Effects of planting density and fertilization on growth characteristics of alfalfa
[Objective]The study is carried out in order to explore the interaction mechanism of planting density and organic fertilizer application rate on the growth of alfalfa in Horqin sandy land,and to determine the suitable plant-ing density and organic fertilizer application rate in high yield and high quality production of alfalfa in Horqin sandy land.[Method]A field plot experiment was conducted to study the effects of two planting densities(15 kg/hm2,12.5 kg/hm2)and five organic fertilizer application rates(0,200,400,600,800 kg/hm2)on the growth characteris-tics and forage yield of alfalfa(Medicago sativa cv Gongnong No.1).[Result]The results showed that planting den-sity,organic fertilizer application rate and their interaction had significant effects on plant height,stem diameter,branch number,growth rate and yield of alfalfa.Each index under low planting density treatment(12.5 kg/hm2)was better than that under high planting density treatment(15 kg/hm2).And each index increased first and then decreased with the increase of organic fertilizer application rate.Under the treatment of planting density of 12.5 kg/hm2 and or-ganic fertilizer application rate of 600 kg/hm2,the stem diameter,branch number,plant height,growth rate,stem-leaf ratio and dry-fresh ratio were significantly higher(P<0.05)than other treatments.The annual yield of forage reached the maximum value of 17 519.53 kg/hm2,which was significantly higher(P<0.05)than other treatments.[Conclusion]The interaction between planting density and organic fertilizer application rate has a great influence on the growth of alfalfa.Reasonable planting density and organic fertilizer application rate can promote the growth of al-falfa and increase the yield of alfalfa.
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