Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (34): 1-8.doi: 10.11924/j.issn.1000-6850.casb2022-0937

    Next Articles

Effects of Tillage Practices and Nitrogen Rates on Dry Matter Accumulation and Remobilization and Grain Yield of Winter Wheat Under Straw Returning Treatment

LI Wenqian(), ZHANG Haijun, HAN Mingming, MU Qun, LV Lianjie   

  1. Zibo Academy of Agricultural Sciences, Zibo, Shandong 255000
  • Received:2022-11-07 Revised:2023-04-24 Online:2023-12-05 Published:2023-11-30

Abstract:

To explore the high yield efficiency cultivation techniques combining different straw returning treatments, tillage practices and nitrogen rates in Huang-Huai-Hai area, field experiments were conducted from 2018 to 2020 with two straw treatments (no straw returning to field, S0; straw returning to field, S1), three tillage practices (rotary tillage, R; deep ploughing, P; subsoiling, B) and four nitrogen rates (135 kg/hm2, N135; 180 kg/hm2, N180; 225 kg/hm2, N225; 270 kg/hm2, N270) at Zibo, Shandong. The results showed that compared with S0, S1 increased the dry matter accumulation (DMA) by 0.6%-17.5%, 1.1%-17% and 1.1%-18.5% at anthesis stage, maturity stage and after anthesis period; the DMA of the whole growth period decreased by 2.8%-22.2% with the decrease of nitrogen rate. Compared with conventional S1+R+N225 pattern, S1+B+N180 pattern improved the DMA by 10.3% and 7.2% at anthesis stage and maturity stage, and increased dry matter remobilization, dry matter remobilization efficiency and dry matter remobilization contribution rate to grain by 45.9%, 35.6% and 27.2%, respectively. Thus, S1+B+N180 pattern had greater grain yield of 10.1% more than S1+P+N225 pattern. In terms of yield components, the spike number of the latter was 10.8% higher than that of the former. The path analysis further confirmed that the increase of spike number was the main reason for boosting grain yield of wheat under S1+B+N180 pattern. Therefore, under similar environmental conditions as this experiment, subsoiling with moderate reduction of nitrogen rate on the basis of straw returning to field is a feasible technique to achieve high yield efficiency of winter wheat production.

Key words: straw returning, tillage practices, nitrogen rates, dry matter accumulation and remobilization, grain yield