Chinese Journal OF Rice Science >
Response of Machine-transplanting Quality and Yield Formation of Hybrid Rice Pot-mat Seedlings to Pot Depth
#These authors contributed equally to this work
Received date: 2024-11-13
Revised date: 2025-05-22
Online published: 2025-07-21
【Objective】 Pot-mat seedlings can effectively constrain root system, thereby reducing damage during rice mechanical transplanting. Elucidating the impact of pot depth on the machine-transplanting quality and yield formation of hybrid rice pot-mat seedlings will lay a theoretical basis for developing suitable hybrid rice pot-mat seedling trays. 【Method】 The experiment selected the indica-japonica hybrid rice Yongyou 1540 as material. An ordinary mat seedling tray (CK, blanket seedling tray, pot depth of 0 cm) was used as the experimental control. Four pot depth types were set as treatments: T1 (pot-mat seedling tray, pot depth 0.4 cm, pot volume 1.6 cm³); T2 (pot-mat seedling tray, pot depth 0.8 cm, pot volume 3.2 cm³); T3 (pot-mat seedling tray, pot depth 1.2 cm, pot volume 4.8 cm³); T4 (pot-mat seedling tray, pot depth 1.6 cm, pot volume 6.4 cm³). All treatments use seedling trays of the same size(length×width×height=58 cm×28 cm×2.8 cm). The sowing specifications were 14 holes horizontally and 29 holes vertically per tray, 3 seeds per hole, and the seeding rate per tray was 30.94 g. Comparative analysis was conducted on different treatments for mat-forming ability, rice seedling quality, machine-transplanted quality, mechanical root damage, physiological indexes of seedlings after machine transplanting, and yield formation of rice populations. 【Results】 (1) The increase in pot depth reduced root damage from machine transplanting and increased root vitality, leaf soluble sugar, and chlorophyll content in rice seedlings after machine transplanting. Seedlings with a pot depth of 1.6 cm had poor mat-forming properties; this treatment had a high seedling leakage rate and low planting uniformity after machine transplanting. (2) The increase in pot depth promoted tillering, increased leaf area index, and increased dry matter accumulation. (3) Higher pot depth resulted in higher yield of rice populations, attributed to more productive panicles. 【Conclusions】 Increasing pot depth can reduce root damage in rice seedlings and increase productive panicle number in rice populations to achieve high yield. However, pot-mat seedlings with too deep pots are difficult to form a mat and have poor machine-transplanted quality. The pot depth of the pot-mat tray should not exceed 1.2 cm at large pot volume and low sowing rate. In actual production, it is suggested to increase pot depth of the pot-mat tray while ensuring successful mat formation, to facilitate the establishment of high-yield populations through mechanized transplanting of hybrid rice pot-mat seedlings.
Key words： hybrid rice; pot-mat seedling; machine-transplanting quality; root damage
TANG Chenghan, CHEN Huizhe, HUAI Yan, SUN Liang, ZHANG Yuping, XIANG Jing, ZHANG Yikai, WANG Zhigang, XU Yiwen, WANG Yaliang . Response of Machine-transplanting Quality and Yield Formation of Hybrid Rice Pot-mat Seedlings to Pot Depth[J]. Chinese Journal OF Rice Science, 2025 , 39(4) : 491 -500 . DOI: 10.16819/j.1001-7216.2025.241106
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