Impact of mixed sowing of Astragalus sinicus and rapeseed on rice fields in southern Hunan Province
In order to explore the effects of mixed sowing of Astragalus sinicus and rapeseed on the yield of subsequent rice and soil nutrients in rice fields in southern Hunan Province,this experiment seted up six treatments,including winter fallow(CK),single planting Astragalus sinicus(LF01),single planting rapeseed(LF02),and mixed planting of Astragalus sinicus and rapeseed(LF03-LF05),and the biomass of green manure were compared and analyzed,yield of subsequent rice,and soil physicochemical properties of each treatment.The results showed that the biomass of green manure in the mixed sowing treatment of Astragalus sinicus and rapeseed was significantly higher than that in the single sowing treatment.Among them,the best effect was achieved when the Astragalus sinicus sowing amount was 22.5 kg/hm2 and the rapeseed sowing amount was 3.0 kg/hm2(LF04),which increased by 120.9% and 39.3% compared to Astragalus sinicus and rapeseed single sowing,respectively.At the same time,the yield of LF04 treatment increased by 17.5% compared to CK treatment.The content of organic matter,alkaline nitrogen,available phosphorus,and available potassium in the soil increased by 9.6%,8.1%,7.5%,and 9.6%,respectively.In the southern Hunan Province,compared to planting alone with Astragalus sinicus and rapeseed,the mixed planting of Astragalus sinicus and rapeseed can effectively increase the yield of subsequent rice and improve soil fertility.It is an effective planting model and suitable for promotion in the region.
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