The Effect Of Different Mixed Sowing Ratios Of Bothrichloa Ischaemum And Lespedeza Davurica On Grassland

The experiment was designed in order to research the effect of different mixed sowing ratios of Bothrichloa ischaemum and Lespedeza davurica on forage and soil,screen out the best mixed sowing ratio for planting in the area and provide a theoretical basis for the cultivation and construction of grassland of B.ischaemum and L.davurica.The experiment was conducted at the experimental field of animal science and technology experimental station of Shanxi Agricultural University in Taigu County of Shanxi Province in 2015?2016,B.ischaemum and L.davurica cv.Jinnong No.l as experimental materials,and in accordance with the row ratio of Bothrichloa ischaemum and Lespedeza davurica 9 combined ratios were set(B.ischaemum:L.davurica = 0:5,1:1,1:2,1:3,1:4,2:1,3:1,4:1,5:0),using randomized block design,comparing the production performance,nutritive value,soil nutrients,and evaluating the production performance and nutritive value of the grassland.The results were as follows:1.B.ischaemum and L.davurica in early growth stage growed slowly,medium-term growth speeds increased significantly;The maximum height of B.ischaemum was B1:L4(81.77 cm),the maximum height of L.davurica was BO:L5(101.45 cm).The best ratio of stem and leaf was B4:L1.The highest total hay yield was B1:L3(15.77 t·hm-2),followed by B1:L4(15.21 t·hm-2),B1:L2(14.00 t·hm-2),extremely significantly higher than other mixed grassland(P<0.01).The competitiveness of B.ischaemum was greater than L.davurica in B4:L1,B3:L1,B2:L1,B1:L1,the competitiveness of L.davurica was greater than B.ischaemum in B1:L4,B1:L3,B1:L2.2.The content of CP in the mixed pasture was higher than that of moncluture B.ischaemum grassland,lower than moncluture L.davurica.In mixed pasture,the highest of CP was B1:L4(11.95%),the least of NDF was B1:L3(54.52%),the least of ADF was moncluture L.davurica grassland(35.06%),the highest of EE was B3:L1(1.31%),significantly higher than other mixed sowing ratios(P<0.05),the least of Ash was B1:L2(6.59%),the highest of Ca was B1:L3(1.26%),extremely significantly higher than other mixed sowing ratios(P<0.01),the highest of P was B1:L4(0.44%),extremely significantly higher than other mixed sowing ratios(P<0.01).The results of comprehensive evaluation of grassland of different mixed sowing ratios was B1:L4>B1:L3>B0:L5>B1:L2>B1:L1>B3:L1>B2:L1>B4:L1>B5:L0.B1:L4 was the best comprehensive evaluation of grassland,followed by B1:L3.3.With the deepening of soil layer soil nutrients decreased,0-10cm nutrient nitrogen was the largest,at the early growth stage of forage the soil alkali hydrolyzable N of moncluture L.davurica was the highest(22.05mg-kg-1),extremely significantly higher than other mixed sowing ratios(P<0.01),along with the growth of grass the moncluture B.ischaemum nitrogen content reached the maximum(21.35 mg·kg-1),extremely significantly higher than other mixed sowing ratios(P<0.01);In the whole growth process of forage the largest of soil organic matter content was B1:L3,significantly higher than that of other mixed sowing ratios(P<0.05),and the highest soil available nutrients was moncluture L.davurica grassland,followed by moncluture B.ischaemum grassland;With the growth of grass,the content of organic matter,available P and available K in grassland were increasing.