| A randomized block design was adopted in the experiment.Two annual legume grasses and grass oats were mixed in the field.Four mixed sowing modes and three single sowing groups were studied,which were peer mixed sowing,interrow mixed sowing,cross mixed sowing,strip-spreading mixed sowing,oat single sowing,hairy vetch single sowing and smooth leaf purple flower flower single sowing.The effects of four mixed sowing modes(peer mixed sowing,interrow mixed sowing,cross mixed sowing,strip-sowing mixed sowing)and three single sowing modes(oat single sowing,hairy vetch single sowing,smooth leaf purple vetch single sowing)on the agronomic characters,yield and quality of forage grass were studied.The yield and quality of forage grass were comprehensively evaluated and selected by the method of grey correlation analysis.The effects of different treatments on forage yield were studied from the point of view of the interaction between species.The factors related to yield and nutritional quality in diferent mixed sowing patterns were discussed.The main results were as follows:(1)There is no significant difference in oat plant height and legume grass plant height under different mixed sowing modes,and the plant height of mixed sowing oat is better than that of single sowing oat.In mixed sowing with Ranunculus terrestris,the highest values of oat and Ranunculus terrestris are 89.67cm and 82.50cm respectively.In the mixed sowing with Vicia glabra,the highest value was 84.67cm under cross mixed sowing and 82.35cm;under inter-row mixed sowing.The tiller number of oat in mixed sowing mode is better than that of oat unicast.In mixed sowing with Ranunculus japonicus,the tiller number of cross mixed sowing oat is the best,which is 231.00 plants/m,and the tiller number of Ranunculus japonicus is the best,which is 82.50 plants/m.The number of branches in mixed sowing mode is lower than that in single sowing mode,and the number of branches in mixed sowing mode is the best.In the mixed sowing with Vicia glabra,the tiller number of oat is the best,which is 253.17 plants/m,and the branch number of Vicia glabra is the best,which is 75.83 plants/m.There is no significant difference in the fresh-dry ratio of oat and leguminous forage under different mixed sowing modes,and the fresh-dry ratio of mixed sowing oat is greater than that of oat unicast,while that of mixed sowing leguminous forage is lower than that of leguminous forage(2)Under different mixed sowing modes,there is no significant difference in nutritional indexes such as dry matter,crude protein,crude fat,neutral washing fiber,acid washing fiber,crude ash and relative feeding value.Under mixed sowing mode,dry matter,crude protein,crude fat and relative feeding value are all higher than oat unicast,while neutral washing fiber and acid washing fiber are lower than oat unicast.Among them,the crude protein content was the highest,which was 9.80%,the crude fat was the highest,which was 1.65%,and the relative thought feeding value was the highest,which was 133.90%,when it was mixed with Vicia crassipes.(3)The interspecific compatibility of grass-bean mixed grassland was better,and the promoting effect was greater than that of competition,and the mixed sowing species had a significant effect on the total forage yield.The total forage yield of oat+hairy vetch combination was about 1.34%higher than that of oat+ smooth-leaf purple vetch bean combination.The species competition effect of the two mixed sowing combinations was that the intraspecific competition was greater than the interspecific competition of oat+smooth-leaf purple vetch combination.The result of competition is that leguminous forage restricts the expansion of grass population,which is related to the slender stalk of leguminous forage and the upward growth of oats.(4)The plant height and tiller number of grasses were significantly affected by the mixed sowing pattern.The types of cereal beans also had a significant effect on the total yield of mixed sowing,and the most suitable mixed sowing method varied with different kinds of mixed sowing.The mixed sowing yield of oat+hairy vetch combination was the best in interrow mixed sowing,while the combination of oat+smooth leaf purple vetch was the best in cross mixed sowing.The mixed sowing mode has a significant effect on the total yield,and the interspecific mixed sowing mode has more advantages,and the interspecific competitiveness is less than other mixed sowing methods,the mixed sowing type has no significant effect on the forage quality,but the mixed sowing mode has a significant effect on some quality.(5)Through the grey correlation evaluation and the comprehensive consideration of sowing practice,the mixed sowing effect of oat+hairy vetch combination was the best in cross-sowing,with a yield of 581.86 kg.Compared with single-sowing oat,the yield increased by 15.47%,while the combination of oat+smooth-leaf purple vetch was the best in strip-sowing mixed sowing.The yield is 563.46 kg,which is 11.82%higher than that of single sowing oat,and it is easy to sow,so it is suitable to be popularized and planted locally. |
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