Dry matter accumulation characteristics of sweet potato cultivated with film mulching
In order to explore the dry matter accumulation characteristics and yield enhancement effect of sweet potato under mulching culture,the study was conducted in Lulong County,Qinhuangdao,Hebei Province in 2021,using the local main cultivars Luxuan 1 and Jishu 25 as experimental materials,and using non-mulching cultivation as the control,and the differences in vine length,dry matter accumulation characteristics and yield of sweet potato under mulching and non-mulching cultivation were compared and analyzed under field conditions.The results showed that the aboveground stems and vines grew faster under film mulching,the aboveground dry matter accumulation was faster in the early growth stage,and the transfer to the root tuber was more in the late growth stage.Under film mulching,the root tubers expanded early and quickly,and the dry matter accumulation of the roots showed a doublet curve.The dynamics of dry matter accumulation in the whole plant of sweet potato conformed to the Logistic model,and the dry matter accumulation period of sweet potato under mulching culture entered the rapid dry matter accumulation period earlier,the total dry matter accumulation was more,and the ratio of dry weight of stems and leaves to tuber dry weight(T/R value)was lower than that of non-mulching cultivation in most of the time.The number of sweet potato tubers per plant increased,the weight per plant increased,the rate of large and medium potatoes increased,and the rate of small potatoes decreased,and the yield increase effect was obvious.In conclusion,film mulching cultivation can change the dry matter accumulation characteristics of sweet potato and increase yield.This study provides a theoretical basis for the production and promotion of sweet potato under film mulching.
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