Effect of Alfalfa and Elymus sibiricus Mixture on Forage Yield and Soil Nutrients
This study aimed to establish an artificial grassland with a legume-grass mixture to achieve sustained high yield and significant improvement in soil fertility.A mixed sowing grassland consisting of Qingmu No.1(Elymus sibiricus cv.Qingmu No.1)and Qingshui alfalfa(Medicago sativa cv.Qingshui)in the third year of planting was selected to evaluate the hay yield and soil fertility characteristics using dif-ferent legume-grass mixed ratios(2∶4,2∶5,2∶6,2∶7,and 2∶8)and sowing methods(mixed cropping and intercropping).The results showed that the mixed sowing method and ratio significantly influenced forage yield.The highest hay yield was achieved with a mixed ratio of 2∶4 using mixed cropping method,which was 7 times higher than with E.sibiricus monoculture.There was no significant difference in soil organic matter content among the treatments.Soil total nitrogen and available nitrogen contents with a mixed ratio of 2∶5 using the mixed cropping method and intercropping method were significantly higher than in other treatments,increasing by 80.00%and 21.99%,respectively,compared to E.sibiricus monoculture.Soil available nitrogen content with a mixed ratio of 2∶5 using the intercropping method increased by 17.47%compared with alfalfa monoculture.With an increase in E.sibiricus ratio,soil available phosphorus content changed significantly.Soil available phosphorus content with a mixed ratio of 2∶8 using the intercropping method increased by 1.4 and 2.4 times compared to E.sibiricus and alfalfa monocultures,respectively.Soil available phosphorus content with a mixed ratio of 2∶7 using the intercropping method increased by 1.7 times compared to alfalfa monoculture.Compared with alfalfa monoculture,soil total potassium content with a mixed ratio of 2∶6 using both mixed cropping and intercropping methods increased by 12.55%and 9.04%,respectively,and the soil available potassium content increased by 9.95%and 8.95%,respec-tively.Compared with E.sibiricus monoculture,soil available potassium content with a mixed ratio of 2∶6 using both mixed cropping and intercropping methods increased by 13.32%and 11.26%,respectively.The grey correlation analysis revealed that all mixed sowing treatments were superior to monoculture treat-ments,with the legume-grass ratio of 2∶5 and 2∶6 being relatively optimum.
NETL
NSTL
万方数据
维普
