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Outline
The aim of this study was to clarify the effects of precision drill sowing (PS) on yield of machine-transplanted rice in Guangxi, and to provide technical support for mechanized production and improvement of large-scale yield per unit area of rice in Guangxi Zhuang Autonomous Region.
The seeds of Changliangyou 8, Changliangyoufuxiangzhan, Huashengyoujingguizhan, Jingmeisixiang, Juxiangsimiao and Guangliangxingui were precisely drill-sown (PS) with the same seed sowing rate used in traditional broadcast sowing (BS) as the control. The seedling quality, mechanical transplanting quality, dry matter production, and yield were investigated.
1) Compared with BS, PS improved the seedling uniformity and root interlocking force by 5.68%-15.47% and 7.65%-24.21%, respectively. 2) PS significantly reduced the rate of missing hills by 54.72%-76.67%, increased the uniformity of the seedling number per hill, the peak number of seedlings, and the uniformity of the number of productive tillers by 37.91%-104.73%, 16.49%-24.18%, and 6.67%-13.72%, respectively. 3) Compared with BS, PS increased the leaf area index (LAI) and effective LAI during heading stage, photosynthetic potential, and improved the dry matter accumulation from transplanting to jointing and from jointing to heading stages, as well as the dry matter accumulation of population at maturity stage. 4) The significant increase in the number of productive tillers and population spikelets in the PS treatment was one of the important reasons for achieving high grain yield.
Precision drill sowing in mechanical transplanting reduced the rate of missing hills, improved the uniformity of the seedling number under mechanical transplanting, increased the number of productive tillers and its uniformity, LAI, and photosynthetic potential, promoted the accumulation of dry matter, which resulted in an increase in grain yield.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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