| In order to clarify the effects of different suppression periods on wheat yield and dry matter accumulation and transport under the wide planting pattern of wheat,field experiments were conducted in the wheat growing season of 2018-2020 under different suppression periods.The tested wheat variety was Taikemai 33,and 11 suppression treatments were set up:SP1(before sowing),SP2(after sowing),SP3(before sowing + after sowing),SP4(before sowing + after sowing+ re-greening period),SP5(before sowing + after sowing+booting period),SP6(before sowing + after sowing+ re-greening + booting period),SP7(after sowing+ re-greening period),SP8(after sowing+booting period),SP9(after sowing+ re-greening period + booting period),SP10(re-greening period),SP11(booting period),with nosuppression during whole growth period as CK.The soil moisture content and dry matter accumulation at different growth stages of wheat were measured,and the dry matter accumulation and transport characteristics of wheat under different treatments were systematically analyzed,as well as the effects on population dynamics,yield and yield components of wheat.The results showed that the number of spike and yield of wheat under SP8 treatment were the highest,reaching 686.6×10·hm-2and 10 818 kg·hm-2,respectively,which were significantly different from those under other treatments; Suppression treatment significantly affected the population dynamics of wheat. Under SP8 treatment,the population at jointing stage,flowering stage and maturity stage were the largest,and the differences were significant from that under other treatments.Under the treatment of SP8,the biomass of the whole growth period was the highest,reaching 16 085 kg·hm-2,and the harvest index was 52.7%; the dry matter translocated before anthesis reached 4 156 kg·hm-2,and the contribution rate was 49.0%,which was also significantly higher than that under other treatments.Based on the above results,different suppression periods had significant effects on wheat yield and dry matter accumulation and transfer under the wide sowing mode,and the best suppression method was SP8 treatment,that is the suppression after sowing and at booting stage. |
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