Research of Planting Density on Yield and Quality of Suinong 22

The effect ofdifferent density on yield and quality of Soybean varieties of Suinong 22 was studied in 2007.The results indicated that in a certain extent,the 100-grain weight was increased and the pots per plant were decreased with the increasing of the density in a certain extent.When the density between 50 000 and 350 000 plant per hectare,the pot number,grain number were increased with the increasing of the density.With the increasing of density,when the density between 50 000 and 300 000 plant per hectare,the oil concentrate was increased and the protein concentrate was decreased with the increasing of the density,when the density over 300 000 plant per hectare,the concentrate of protein was increased.Plant yield,pot number per plant,seed number per plant,node number,stem diameter,branches number,protein content and oil content were all significant negative correlation with the density.Pot number per square meter,seed number per square meter,100-grain weight,plant height were significant positive correlation.Oil content and density was positive correlation,yield with pot per square meter,seed number per square meter was significant positive correlation.So,the suitable density for Suinong 22 was between 300 000 and 350 000 plant per hectare.