三熟制油菜谷林飞套播开沟方式对油菜生育及产量的影响OA

Under the three-cropping system of early-maturing rapeseed-early rice-late rice,the suitable furrowing method of rapeseed was studied in order to provide a theoretical reference for the cultivation of rapeseed in the three-cropping system.The experimental design included different rape varieties of'Ganyouza 906'(V1)and'Zhongyou 988'(V2).Different ditching methods,including non-ditching treatment(T1),artificial ditching treatment(T2),and mechanical ditching and soil covering treatment(T3),were used to study the effects on rape population density,dry matter accumulation,pre-winter traits,stress resistance,agronomic traits at maturity,yield and economic benefits.The results showed that the seedling density of T3 was significantly lower than those of T2 and T1.Compared with T1 treatment,T3 and T2 significantly increased the dry matter accumulation of rapeseed at seedling stage.Different varieties showed no significant difference in total leaf number,maximum leaf width and rhizome diameter,but the maximum leaf length showed significant difference between two varieties.There was no significant difference in the total number of leaves among different furrowing methods,but the maximum leaf length,maximum leaf width and rhizome diameter showed significant differences among three furrowing methods.Ditching significantly improved the stress resistance of rapeseed compared with non-ditching.Plant height,effective silique number of main inflorescence and seed number per silique of T3 and T2 showed significant difference with T1.The number of first effective branches,the total length of main sequence and the number of effective pods of branches showed significant differences under the three ditching methods.The yield of V2T3 treatment was increased by 0.43%,22.17%,16.19%,18.36%and 43.21%than that of V2T2,V2T1,V1T3,V1T2 and V1T1,respectively.The ratio of output to input was also the highest in V2T3 treatment,which was improved by 10.30%,15.92%,30.00%,29.08%and 52.94%than that of V2T1,V1T3,V2T2,V1T1 and V1T2.Under the three-cropping system of early-maturing rape-early rice-late rice,the suitable ditching method for rice-planting rape is mechanical ditching and soil covering for'Ganyouza 906'and'Zhongyou 988'.