Effects of Different Shrub-grass Combinations and Rows Ratios on Forage Yield in Indigofera amblyantha-grass Land
[Objective]The effects of shrub-grass combinations and row ratios on forage yield in shrub-grass land were explored to provide the basis for establishment and forage production in I.amblyantha-grass land in the middle and low altitude karst area of Guizhou Province.[Method]Taking I.amblyantha cv.Qiannan(I),Lolium multiflorum cv.Diamond-T(L),Paspalum wettsteinii(P)and Medicago sativa cv.WL525HQ(M)as test materials,the randomized block experiment design was employed to study the variation in forage yield of 7 I.amblyantha-grass combinations(A1,I 13.50 kg/hm2+L 24.00 kg/hm2;A2,I 13.50 kg/hm2+P 9.00 kg/hm2;A3,I 13.50 kg/hm2+P 9.00 kg/hm2+M 7.50 kg/hm2;A4,I 13.50 kg/hm2+P 11.70 kg/hm2+M 3.00 kg/hm2;A5,I 13.50 kg/hm2+L 8.40 kg/hm2+P 8.10 kg/hm2+M 3.75 kg/hm2;A6,I 13.50 kg/hm2+L 12.00 kg/hm2+P 4.50 kg/hm2+M 7.50 kg/hm2;A7,I 13.50 kg/hm2+L 14.40 kg/hm2+P 4.95 kg/hm2+M 5.25 kg/hm2)with 5 row ratios of shrub-grass(B1,1∶3;B2,1∶2;B3,1∶1;B4,2∶1;B5,3∶1).[Result]Shrub-grass combinations and row ratios significantly affected the yield component of shrub and grass and total yield.The higher total yield was observed in shrub-grass land of I.amblyantha mixed with 3 herbaceous species,among which A6 performed the best with an average production of 15.25 t/hm2.The B1(1:3)and B2(1:2)of I.amblyantha:grass ratio had the best effect,with an average production of 13.33 t/hm2 and 14.13 t/hm2 respectively.Among different established patterns,A6B1 showed the highest total yield(16.66 t/hm2),followed by A6B2(15.94 t/hm2)and A6B3(15.77 t/hm2).[Conclusion]The shrub-grass combination of 13.50 kg/hm2 I.amblyantha+12.00 kg/hm2 L.multiflorum+4.50 kg/hm2 P.wetsfeteini+7.50 kg/hm2 M.sativa with 1∶3 of shrub:grass ratio can get the highest yield,which could be popularized and applied in the I.amblyantha-grass land establishment of the middle and low altitude karst area of Guizhou.
Indigofera amblyanthaI.amblyantha cv.Qiannanshrub-grass landshrub-grass combinationrow ratioforageyieldkarst areas
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