Differences in rice yield and biomass accumulation dynamics for different direct seeding methods after wheat straw return

We performed a 2-year field study to assess the effect of wheat straw return on dry and wet direct-seeded rice, and we modeled biomass accumulation using the Richards equation. Wheat straw return reduced the yield and biomass of direct-seeded rice, and this effect was greater for dry direct-seeded rice. Wet direct-seeded rice showed a higher rate and amount of biomass accumulation at the early growth stage, as well as higher tiller numbers, which improved panicle numbers and total spikelet numbers and thereby increased yield compared with dry direct-seeded rice. AbstractField experiments were performed in 2019 and 2020 to explore yield performance and biomass accumulation dynamics for different direct-seeded rice methods after wheat straw return. The experimental treatments included two direct-seeded rice methods (dry direct-seeded rice and wet direct-seeded rice) and two wheat straw return treatments (with and without wheat straw return). Wheat straw return had a negative impact on the yield and biomass of direct-seeded rice. Compared with wet direct-seeded rice, dry direct-seeded rice was more negatively affected, with yield and biomass reduced by 6.7% –7.6% and 5.4%–6.5%, respectively. The yield loss was mainly associated with insufficient total spikelet numbers caused by reduced panicle numbers. A lower maximum tiller number caused by the restricted seedling tillering capacity was partly responsible for the inadequate panicle numbers in dire ct-seeded rice after wheat...

Source: Food and Energy Security - October 6, 2022 Category: Food Science Authors: Jinyu Tian, Shaoping Li, Zhipeng Xing, Shuang Cheng, Baowei Guo, Yajie Hu, Haiyan Wei, Hui Gao, Ping Liao, Huanhe Wei, Hongcheng Zhang Tags: ORIGINAL ARTICLE Source Type: research