Scientia Agricultura Sinica ›› 2026, Vol. 59 ›› Issue (14): 3038-3055.doi: 10.3864/j.issn.0578-1752.2026.14.004

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Effects of Sowing Density on Culm Lodging Resistance in the Main Crop and Annual Grain Yield of Precision Hill-Direct-Seeded Ratoon Rice

ZHANG WuJun1(), DUAN XiuJian2, LIANG ZiMeng1, DU Bin1, TANG YongQun1, LI JingYong1(), YAO Xiong1()   

  1. 1 Rice Research Institute of Chongqing Academy of Agricultural Sciences/Chongqing Rice Ratooning Research Center, Chongqing 401329
    2 Xiuzhou District Fruit Tree and Sericulture Technology Extension Station, Jiaxing 314011, Zhejiang
  • Received:2025-09-23 Accepted:2026-06-10 Online:2026-07-16 Published:2026-07-21
  • Contact: LI JingYong, YAO Xiong

Abstract:

【Objective】The objective of this study was to investigate the regulatory effects of sowing density on stem lodging resistance in main crop and annual grain yield of precision-hill-direct-seeding ratoon rice. The results could provide a scientific basis for ratoon rice production with high yield and lodging resistance to adapt to direct seeding and simplified cultivation.【Method】From 2022 to 2023, a field experiment was conducted using two hybrid indica rice varieties Yuxiangyou8133 (YXY8133) and Taiyouyuehesimiao (TYYHSM) with five sowing densities, namely, D1: 150 000 hills/hm2, D2: 195 000 hills/hm2, D3: 240 000 hills/hm2, D4: 285 000 hills/hm2, and D5: 330 000 hills/hm2. The study focused on analyzing the relationships of stem mechanical parameters, morphological traits, dry matter accumulation and distribution, and culm and leaf sheath chemical composition with stem lodging resistance in the main crop and grain yield in the main and ratoon crops under the precision-hill-direct-seeding ratoon rice system.【Result】With increased sowing density, rice yield in both main and ratoon crop increased first and then decreased, and annual yield was highest under D3, reaching 14.03 and 13.23 t∙hm-2 for YXY8133 and TYYHSM, respectively. Compared with the D1 treatment, D2 and D3 treatments slightly increased stem lodging index of main crop by 3.91%-14.69% and 1.48%-5.77% for YXY8133 and TYYHSM, respectively; D4 and D5 treatments markedly increased the lodging index by 31.67%-40.74% and 10.54%-23.27% for YXY8133 and TYYHSM, respectively. The increased sowing density induced significant reduction of breaking moment of basal internodes and thereby, mainly contributed to higher stem lodging index in main crop. Internode length, panicle length, plant height, and gravity center height did not differ significantly among sowing-density treatments, but LAI increased significantly with higher sowing density. The culm and leaf sheath dry weight per plant, panicle dry weight per plant, basal internode culm and leaf sheath plumpness, stem diameter and wall thickness of D3 treatment decreased slightly when compared with D1, thereby maintaining high stem mechanical strength; while D4 and D5 treatments showed larger reduction, and with differences reaching significance for TYYHSM. Further, D4 and D5 treatments significantly decreased the soluble sugar content, starch content, cellulose and lignin content in culm and leaf sheath per plant of main crop at heading stage and thus, resulted in poor stem quality and a higher lodging index in main crop. Correlation analysis showed that culm and leaf sheath dry matter weight per plant, culm wall thickness, soluble sugar content, starch content, cellulose and lignin content were significantly and positively correlated with breaking moment of basal internodes, but significantly and negatively correlated with lodging index.【Conclusion】The appropriate sowing density can effectively balance the trade-off between population size and individual plant growth in main crops under precision hill-direct-seeding ratoon rice, enhance individual plant robustness by maintaining high stem quality, improve the population structure, and consequently, enhance stem lodging resistance and yield performance; D3 treatment was the suitable sowing density to coordinate the lodging resistance in main crop and the high yield of ratoon rice system.

Key words: precision-hill-direct-seeding ratoon rice, lodging resistance, yield, sowing density, clum quality

Fig. 1

Daily average temperature, total solar radiation and precipitation from 2022 to 2023 at the experimental site"

Table 1

Variations in growth duration of the main crop and ratoon crop under precision hill-direct-seeding ratoon rice"

年份 Year 品种 Varietie 头季 Main crop 再生季 Ratoon crop 周年生育期Annual growth duration
播种期 Sowing date 拔节期Jointing stage 抽穗期 Heading stage 成熟期 Mature stage 生育期 Growth duration 抽穗期 Heading stage 成熟期 Mature stage 生育期 Growth duration
2022 渝香优8133 YXY8133 03-29 06-10 07-14 08-12 136 09-10 10-15 64 200
泰优粤禾丝苗 TYYHSM 03-29 06-06 07-08 08-08 132 09-03 10-08 61 193
2023
渝香优8133 YXY8133 03-29 06-15 07018 08-21 145 09-16 10-20 60 205
泰优粤禾丝苗 TYYHSM 03-29 06-11 07012 08-17 141 09-11 10-14 58 199

Fig. 2

Effects of sowing density on grain yield in both main and ratoon seasons under precision hill-direct-seeding ratoon rice Different lowercase letters indicate significant differences among different treatments of the same variety at the 0.05 level. D1, D2, D3, D4 and D5 indicate row spacing×hill spacing by 30.0 cm×22.2 cm (150 000 hills/hm2), 30.0 cm×17.1 cm (195 000 hills/hm2), 30.0 cm×13.9 cm (240 000 hills/hm2), 30.0 cm×11.7 cm (285 000 hills/hm2) and 30.0 cm×10.1 cm (330 000 hills/hm2), respectively. The same as below"

Table 2

Effects of sowing density on stem lodging index and mechanical parameters in main season under precision hill-direct- seeding ratoon rice"

年份
Year
品种
Varietie
处理
Treatment
折断弯矩
Breaking moment
(g∙cm)
弯曲力矩
Bending moment of the whole plant (g∙cm)
倒伏指数
Lodging index
(%)
2022 渝香优8133
YXY8133
D1 3040.01±102.61a 2890.10±126.26a 95.16±5.58c
D2 3061.23±65.96a 3024.58±251.59a 98.84±8.56c
D3 2917.50±171.40a 2906.70±175.89a 99.65±2.53c
D4 2405.88±79.44b 2917.94±177.53a 121.35±7.90b
D5 2001.30±22.41c 2754.89±223.43a 137.60±10.13a
泰优粤禾丝苗
TYYHSM
D1 2679.19±94.57a 1953.38±43.17a 72.94±1.41b
D2 2551.02±132.19ab 1893.40±113.82ab 74.33±5.45b
D3 2424.20±141.11ab 1911.47±71.02ab 78.89±3.46b
D4 2042.47±102.26c 1749.02±45.45c 85.74±3.96a
D5 2073.87±131.38c 1806.61±47.79bc 87.26±3.39a
2023 渝香优8133
YXY8133
D1 2542.27±244.07a 3787.31±475.47a 148.86±10.64c
D2 2394.01±117.02ab 3700.34±81.72a 154.71±4.51bc
D3 2168.16±188.58abc 3917.08±517.98a 180.22±8.51ab
D4 2015.92±200.85bc 3994.07±153.15a 199.94±27.27a
D5 1982.58±96.21c 4074.35±206.45a 205.83±14.66a
泰优粤禾丝苗
TYYHSM
D1 2356.54±124.99a 2 485.81±144.61a 105.60±6.41b
D2 2287.33±157.43ab 2 444.92±182.81a 106.87±1.18b
D3 2268.33±180.41ab 2 502.02±358.79a 109.94±6.96b
D4 2109.07±334.12ab 2 343.21±344.67a 111.61±10.38b
D5 1891.547±259.29b 2 509.19±380.91a 132.84 ±10.93a
方差分析 ANOVA
年份Year (Y) 58.15** 154.17** 418.03**
品种Variety (V) 19.57** 373.17** 372.36**
密度Density (D) 37.38** 0.09 28.60**
Y×V 12.34** 9.83** 47.03**
Y×D 3.45* 1.07 1.36
V×D 1.62 0.57 6.24**
Y×V×D 2.53 0.40 2.06

Table 3

Effects of sowing density on plant height, gravity center height, and culm morphological traits and plumpness of N5 internodes in main season under precision hill-direct-seeding ratoon rice"

年份 Year 处理
Treatment
株高
Plant height
(cm)
重心高度
Gravity center height (cm)
茎充实度
Culm dry weight
per cm (mg∙cm-1)
鞘充实度
Leaf sheath dry weight per cm (mg∙cm-1)
茎粗
Culm diameter
(mm)
茎壁厚
Culm wall thickness (mm)
2022 渝香优8133 YXY8133 D1 128.70±4.26a 54.49±2.62a 40.07±3.88a 21.43±2.48a 6.22±0.15a 1.02±0.01ab
D2 130.22±4.56a 54.86±3.82a 35.63±2.54ab 20.43±3.78ab 6.08±0.16ab 0.97±0.06ab
D3 127.98±2.67a 54.12±1.65a 40.43±3.61a 21.13±1.90a 6.18±0.11a 1.03±0.02a
D4 127.47±3.94a 54.50±1.95a 35.03±2.31ab 18.17±2.57ab 5.78±0.29bc 0.95±0.06b
D5 125.39±5.09a 53.30±2.71a 32.87±3.38b 15.77±1.46b 5.66±0.07c 0.94±0.01b
泰优粤禾丝苗 TYYHSM D1 106.41±0.69a 49.29±3.68a 35.53±3.61a 19.37±1.46ab 5.87±0.22a 0.93±0.03a
D2 105.12±3.61ab 49.06±2.94a 35.87±5.37a 20.43±1.22a 5.52±0.19ab 0.94±0.04a
D3 104.01±1.41ab 48.04±0.62a 35.40±0.80a 19.73±1.01a 5.52±0.13ab 0.93±0.06a
D4 101.24±2.44b 48.56±3.74a 29.77±3.59ab 18.80±0.51bc 5.13±0.02b 0.83±0.02b
D5 100.90±1.16b 46.26±1.88a 28.17±3.09b 16.90±0.67c 5.27±0.02b 0.84±0.04b
2023 渝香优8133 YXY8133 D1 137.81±2.75b 57.77±0.49a 35.44±1.28a 18.00±2.87a 6.95±0.17a 0.95±0.03a
D2 137.64±2.45b 55.11±2.00a 36.81±7.01a 17.22±2.58a 7.12±0.16a 0.88±0.03a
D3 143.56±4.45ab 58.30±2.73a 37.14±3.03a 15.56±4.04ab 6.98±0.47a 0.85±0.07a
D4 144.88±3.26a 57.76±3.03a 37.46±3.73a 15.40±1.39ab 6.64±0.12ab 0.80±0.04b
D5 143.25±1.58a 59.12±2.27a 35.19±5.66a 14.37±1.12b 6.56±0.05b 0.79±0.03b
泰优粤禾丝苗 TYYHSM D1 108.04±1.90a 47.26±1.37a 36.44±2.63a 24.11±3.04a 6.62±0.10a 0.83±0.06a
D2 108.41±2.07a 47.01±1.66a 35.63±3.50a 20.85±4.21a 6.66±0.10a 0.83±0.03a
D3 109.45±3.13a 46.49±1.88a 36.41±2.51a 21.48±1.59a 6.50±0.51a 0.81±0.11a
D4 109.98±4.80a 46.77±0.54a 35.67±3.40ab 19.33±1.26ab 6.31±0.10b 0.74±0.04ab
D5 110.53±2.14a 47.64±0.36a 30.59±1.49b 19.18±2.71b 6.12±0.08b 0.70± 0.03b
方差分析 ANOVA
年份 Year (Y) 117.82** 3.14 0.52 0.82 267.74** 95.53**
品种 Variety (V) 1140.86** 187.62** 5.73* 11.67** 72.22** 28.55**
密度 Density(D) 0.43 0.17 3.45* 4.54* 6.61** 7.12**
Y×V 19.86** 14.23** 1.16 15.36** 0.07 4.24*
Y×D 3.54* 1.46 1.00 0.64 1.67 0.86
V×D 1.52 0.46 0.42 0.13 0.69 2.56
Y×V×D 0.50 0.31 0.34 0.56 0.33 0.42

Fig. 3

Effects of sowing density on length of internode and panicle lengths in main season under precision hill-direct-seeding ratoon rice N0 indicates panicle length, N1、N2、N3、N4、N5 and N6 indicate the 1st, 2nd, 3rd, 4th, 5th and 6th elongated internodes below the panicle, respectively"

Fig. 4

Correlation analysis among length of the internode, panicle and lodging index in main season under precision hill-direct- seeding ratoon rice"

Fig. 5

Effects of sowing density on leaf area index (LAI) in main season under precision hill-direct-seeding ratoon rice"

Fig. 6

Effects of sowing density on dry matter accumulation and distribution per plant in main season under precision hill-direct- seeding ratoon rice"

Fig. 7

Correlation analysis among dry weight per plant, lodging index and breaking moment in main season under precision hill-direct-seeding ratoon rice"

Fig. 8

Effects of sowing density on stem chemical components of heading and mature stage in main season under precision hill- direct-seeding ratoon rice"

Table 4

Correlation analysis among length of the internode, panicle and lodging index in main season under direct-seeding ratoon rice"

指标 Index 倒伏指数 Lodging index (%) 折断弯矩 Breaking moment (g∙cm)
折断弯矩Breaking moment (g∙cm) -0.440**
叶面积指数 LAI 0.709** -0.605**
茎充实度 Culm dry weight per cm (mg∙cm-1) 0.106 0.355**
鞘充实度Leaf sheath dry weight per cm (mg∙cm-1) -0.522** 0.403**
茎粗 Culm diameter (mm) 0.682** 0.007
壁厚Culm wall thickness (mm) -0.285* 0.628**
抽穗期单株茎鞘淀粉含量 Starch content per plant at HS (g/plant) -0.503** 0.667**
抽穗期单株可溶性总糖含量 Soluble sugar content per plant at HS (g/plant) -0.124 0.510**
抽穗期单株纤维素含量 Cellulose content per plant at HS (g/plant) -0.539** 0.538**
抽穗期单株木质素含量 Lignin content per plant at HS (g/plant) -0.497** 0.685**
成熟期单株茎鞘淀粉含量 Starch content per plant at MS (g/plant) -0.408** 0.551**
成熟期单株可溶性总糖含量 Soluble sugar content per plant at MS (g/plant) -0.589** 0.608**
成熟期单株纤维素含量 Cellulose content per plant at MS (g/plant) -0.549** 0.507**
成熟期单株木质素含量 Lignin content per plant at MS (g/plant) -0.408** 0.654**
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