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Nutrient Utilization and Double Cropping Rice Yield Response to Dense Planting with a Decreased Nitrogen Rate in Two Different Ecological Regions of South China
| Content Provider | MDPI |
|---|---|
| Author | Luo, Kang Zeng, Yongjun Wu, Ziming Guo, Lin Xie, Xiaobing Shi, Qinghua Pan, Xiaohua |
| Copyright Year | 2022 |
| Description | An increased planting density and decreased nitrogen (N) rate combination may obtain a stable yield and enhance N utilization. However, the effects of an increased planting density and decreased N rate combination on the yield and nutrient utilization in different ecological regions are unclear. The aim of this research was to assess the interactive impacts of the N rates and planting densities on double cropping rice yields and nutrient utilization in two ecological regions in field experiments during 2018 and 2019. The results showed that, at Shanggao, increased planting densities of 67% and 200% compensated for the biomass, nutrient uptake and yield losses from N application reductions of 20% and 27% and increased the nutrient utilization of the early and late seasons. However, at Xingguo, compared with the $N_{2}D_{1}$ treatment (165 kg $ha^{−1}$ with 57 plants per $m^{2}$), the late rice yield under the $N_{1}D_{2}$ treatment (120 kg $ha^{−1}$ with 114 plants per $m^{2}$) decreased by 6.71% and 5.02% in 2018 and 2019, respectively. The photosynthetic rate and nutrient uptake were likely related to the positive interaction on the double cropping rice yield in the two ecological regions. Our results indicate that dense planting is a feasible cultivation strategy to decrease N inputs for double cropping rice, but the low soil nutrient supplies negatively affect stable yields in different ecological regions. |
| Starting Page | 871 |
| e-ISSN | 20770472 |
| DOI | 10.3390/agriculture12060871 |
| Journal | Agriculture |
| Issue Number | 6 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-06-16 |
| Access Restriction | Open |
| Subject Keyword | Agriculture Agricultural Engineering Ecological Region Planting Density Nitrogen Application Nutrient Utilization Double Cropping Rice Yield |
| Content Type | Text |
| Resource Type | Article |
