Effects of Cultivation Factors on Biomass,Nutrient Quality and Weed Inhibition Rate of Rosa roxburghii Tratt Intercropping with Forage Rape
[Objective]The influences of young Rosa roxburghii intercropping with forage rape on the field weed inhibition and the growth of rape were studied to provide a reference for developing an efficient cultivation technique of forage rape intercropping in R.roxburghii orchard.[Method]Taking the forage rape Shengsi No.2 in Qianxi of Guizhou Province as the study object,and then a randomized block design was conducted with cutting period(A1:early flowering stage,A2:full bloom stage A3:final flowering stage)and amount of nitrogen(urea amount,B1:75 kg/hm2,B2:135 kg/hm2,B3:195 kg/hm2,B4:255 kg/hm2)and sowing period(C1:autumn sowing,C2:spring sowing,C3:summer sowing)as research factors.The biomass,plant nutritional quality and the inhibition rate of weed in R.roxburghii orchard were analyzed.[Result]The average biomass(fresh weight)with different treatments of Shengsi No.2 was 1 966.79 kg/hm2-4 243.92 kg/hm2,and the weed inhibition rate was 60.03%-90.23%.The interaction of mowing period,nitrogen application and sowing period,as well as the interaction of two factors had no significant effect on biomass and weed inhibition rate,and the effect of a single factor on biomass and weed inhibition rate reached very significant level(P＜0.01).The average biomass of rape and weed inhibition rate of R.roxburghii orchard showed an increasing trend with the delay of mowing period,and showed an increasing trend with the addition of the application amount of nitrogen,and sowing periods showed C1＞C2＞C3.The nutrition quality of forage rape sowing in autumn was high,with 12.83%-19.86%of crude protein content,2.17%-3.44%of crude fat content,21.60%-32.08%of crude fiber content,0.76%-1.26%of calcium content and 0.25%-0.45%of total phosphorus content.[Conclusion]This annual inter-planting of young R.roxburghii orchard intercropping with forage rape can be achieved in Qianxi of Guizhou Province or similar ecological areas.By appropriately increasing the nitrogen amount,the fresh weight of forage,nutrition quality and weed inhibition rate can be improved.If weeds inhibition is important than forage harvest,it is suggested that apply 195 kg/hm2 urea and mow at the final flowering stage.If forage harvest is important than weeds inhibition,it is suggested that apply 195-255 kg/hm2 urea and mow at the early flowering stage or the full bloom stage.
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