Effects Of Ixed Sowing And Application Of Rapeseed And Oat On Forage Yield And Soil Characters In Saline-alkali Soil

Aiming at the problem of single cropping mode and the increasing demand for forage in the farming-pastoral ecotone in Inner Mongolia,this experiment combines fertilization with different blending ratios of rape(Feed Oil No.2)and oats(Meng Nong Da Yan No.1)to screen out the most suitable mix proportion in saline-alkali land.Research indicates:1.The blending ratio of rapeseed and oats and fertilization treatment had a significant effect on the biomass yield.During this two years,the green yield and hay yield of mixed cropping ro7:3 under fertilizer treatment reached the highest in mixed cropping groups,the green yield and hay yield of mixed cropping ro7:3 increased by 13.28-87.62%and 34.5-86.29%respectively.2.Content of crude protein,crude fat and relative feeding value of forage grass in R07:3 were relatively high in rape and oats mixed cropping group under chemical fertilizer treatment during this two years.The content of crude protein and crude fat in rape mixed cropping group in R07:3 increased by 2.97-6.12%and 12.9-14.47%respectively,compared with monoculture rape.In the same proportion of treatments,chemical fertilizer>organic fertilizer>no fertilizer.3.Under the different treatments of saline-alkali land,mixed rapeseed and oats with 7:3 effectively reduced the salt content.And the soil salt content in R07:3 is the lowest in the chemical fertilizer treatment during this two years,which is 18.4%-40.59%lower than that of monoculture rape and monoculture oats.Besides,R07:3 under chemical fertilizer treatment can effectively reduce soil bulk density.It is reduced by 7.02%and 10.18%compared with monoculture rape and oat.This shows that oats and rape mixed seeding improves soil physical properties.During this two years,the soil organic matter,alkali nitrogen,available phosphorus and available potassium were the highest in R07:3 under the chemical fertilizer treatment,which were increased by 0.36-25.95%,11.32-33.10%,19.24-20.18%and 10.10-12.20%respectively compared with monoculture rape.4.During this two years,the soil catalase activity of R03:7 under mixed fertilizer treatment was the highest,and R07:3 showed the highest activity of soil sucrase and soil urease under different fertilizer treatments during this two years,especially under fertilizer treatments,The increase of oat was 11.82-33.75%,6.45-31.54%,respectively.Fertilizers>organic fertilizers>no fertilization under the same proportion of conditions.Based on the comprehensive forage yield,quality and soil properties of rapeseed mixed with oats,R07:3 was recommended as an optimal planting mode under chemical fertilizer treatment.