Chinese Journal OF Rice Science >
Effects of Hybrid Rice Seedling Quality in Drill-seeding Nursery on Grain Yield in Mechanical Transplanting
#These authors contributed equally to this work
Received date: 2024-04-15
Revised date: 2024-10-08
Online published: 2025-03-19
【Objective】Precision drill sowing improves the quality of machine-transplanted seedlings and enhances population uniformity. This study aims to clarify the relationship between seedling quality of hybrid rice under drill sowing and yield formation in mechanized transplanting, thereby guiding the establishment of high-yield populations. 【Method】Using indica-japonica hybrid rice “Yongyou 1538”, three drill specifications (D1: 16 rows, D2: 18 rows, D3: 20 rows) and three seed usages (seeds per hole, S1: 3, S2: 4, S3: 5) were tested. Each seeding tray was sown 40 times horizontally, with vertical sowing times matching the drill number. Seedling quality, tillering dynamics, leaf area index (LAI), dry matter accumulation, panicle traits, yield, and their components were analyzed. 【Result】 (1) Few drill rows and fewer seeds per hole improved seedling quality, promoting tillering at the 2nd and 3rd leaf positions. The more seeds per hole reduced productive panicle rate. (2) Fewer drills increased LAI and dry matter accumulation. Higher seeds per hole lowered harvest index. (3) Fewer seeds per hole increased grains per panicle and partially improved seed-setting rate. Fewer drills enhanced seed-setting rate of secondary branches. (4) D1 yield exceeded D2 and D3 by 5.0% and 10.8%, respectively; S2 (4 seeds per hole) yield surpassed S1 and S3 by 6.0% and 7.1%. (5) Yield correlated most strongly with seedling fullness (13.94 g increase per 1 mg/cm). 【Conclusion】Robust seedlings enhance low-position tillering. Seedling fullness is a key indicator of seedling vigor, achievable through reduced seeding rates. Under identical basic seedlings, robust seedlings improve LAI and dry matter accumulation, increasing yield via productive panicles.
Key words： hybrid rice; machine-transplanted rice seedling; seedling quality; yield
TANG Chenghan, WANG Jingqing, CHEN Huizhe, ZHANG Yuping, XIANG Jing, ZHANG Yikai, WANG Zhigang, HUAI Yan, CHEN Jiafeng, WANG Yaliang . Effects of Hybrid Rice Seedling Quality in Drill-seeding Nursery on Grain Yield in Mechanical Transplanting[J]. Chinese Journal OF Rice Science, 2025 , 39(2) : 245 -254 . DOI: 10.16819/j.1001-7216.2025.240405
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