Long-term no-tillage enhanced maize yield and potassium use efficiency under spring drought year
|Lina Dong1, 2, Xiangfei Han1, 2, Jinyu Zheng2, Xiaodan Liu2, Zhiming Liu2, Yang Luo2, Xiwen Shao1, Yongjun Wang1, 2, and Lichun Wang1, 2*|
|Tillage is an important management tool for tackling and promoting water conservation and improving crop yield. As one of the important nutrients in plant growth, K is involved in important processes such as osmoregulation, photosynthesis and metabolite transport, and plays a particularly critical role in improving crop yield and quality. In the long-term positioning platform of the tillage method, a 2-yr field experiment was conducted in 2019-2020 in maize (Zea mays L.) Three tillage methods: conventional tillage (CT), subsoil tillage (ST), and no-tillage (NT) and two planting densities 6×104 (D1) and 9×104 plants ha-1 (D2) were set up in the experiment. The results showed that yield and K translocation efficiency (KTE) were significantly higher in NT than in CT at D1 (by 4.7% and 12.2%) and D2 (by 14.0% and 13.9%), respectively. At maturity stage in 2019, population DM accumulation after silking (DMA) was significantly higher in NT (by 11.0% and 16.9%) than in CT at D1 and D2. Correlation analysis revealed that yield was significantly positive correlated with ears (r = 0.57***) and DMA (r = 0.64***). Potassium translocation and K harvest index were positively correlated with KTE. Under spring drought year, the long-term no-tillage had a significant yield increase, mainly through the increase in 1000-kernel weight. The increase in K efficiency was mainly through the influence of DM accumulation and distribution, and K accumulation in grain.|
|Keywords: Dense planting, no-tillage, potassium efficiency, spring drought, yield.|
|1Jilin Agricultural University, College of Agronomy, Changchun 130118, Jilin, P.R. China.|
2Institute of Agricultural Resource and Environment, Jilin Academy of Agricultural Sciences/State Engineering Laboratory of Maize, Changchun 130333, Jilin, P.R. China.
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