Intercropping Forage Oat In Alfalfa In Late Growing Season Planting Pattern Research

Intercropping is an effective way of utilize natural resources.The objective of this study is to test if growing oat(Avena sativa L.)at the end of growing season of alfalfa(Medicago sativa L.)as an intercropping model can increase forage yield and affect soil nutrients.The row spacing was 30 cm and 40 cm.Two oat varieties ‘Leader' and ‘Baylor',representing an early and late type,respectively,were planted at 7 and 11 days after the second harvest of alfalfa.Determination of production performance,yield,relative feed value,and land equivalent ratio of alfalfa and forage oats,soil fertility and organic carbon content were analyzed,to study the effects of planting patterns of alfalfa interplanting oats on plant growth,production,forage and soil nutrients,to provide a theoretical basis for selecting a reasonable mode of irrigated land and dry land,the results are as follows:1.In irrigated land,we found that seeding oat 7 days after the second harvest of alfalfa with row spacing of 40 cm of plant height,growth rate,survival rate,leaf stem ratio,total yield,the crude protein content,relative feed value,land equivalent ratio,p H,total phosphorus,alkali hydrolyzable nitrogen,available phosphorus and available potassium,organic carbon were significantly(P < 0.05)higher than monoculture and other planting patterns.Neutral detergent fiber and acid detergent fiber were significantly lower(P <0.05)than single cropping and other planting patterns.There was no significant difference in the reviving rate and dry sale ratio in this model(P > 0.05),and tillering numbe of oats was lower than that of single cropping.Therefore,the planting pattern of seeding oat 7 days after the second harvest of alfalfa with row spacing of 40 cm is conducive to the increase of soil nutrient and forage yield in the irrigated land,and can improve the land utilization rate.2.In the dry land,we found that seeding oat 7 days after the second harvest of alfalfa with row spacing of 30 cm of plant height,growth rate,tillering numbe,leaf stem ratio,dry sale ratio,total yield,the crude protein content,relative feed value of oats,land equivalent ratio,total nitrogen,total phosphorus and available potassium,organic carbon were significantly(P < 0.05)higher than monoculture and otherplanting patterns.Neutral detergent fiber and acid detergent fiber were significantly lower(P < 0.05)than single cropping and other planting patterns.There was no significant difference in the rate of returning green and dry fresh in this model(P > 0.05),and the number of oats was lower than that of single cropping.Therefore,the planting pattern of seeding oat 7 days after the second harvest of alfalfa with row spacing of 30 cm is conducive to the increase of soil nutrient and forage yield in the irrigated land,and can improve the land utilization rate.