Crops ›› 2025, Vol. 41 ›› Issue (4): 224-230.doi: 10.16035/j.issn.1001-7283.2025.04.028

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Effects of Water, Fertilizer and Chemical Regulation on Seedling Quality of Mechanized Casting Transplanting in Late Rice

Tao Zuhao(), Wang Weiqin, Zheng Huabin, Xiang Jun, Tang Qiyuan()   

  1. College of Agriculture, Hunan Agricultural University, Changsha 410000, Hunan, China
  • Received:2024-04-17 Online:2025-08-15 Published:2025-08-12

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Abstract:

In order to explore the effects of water, fertilizer and chemical regulation on the quality of mechanized casting seedlings of late rice, a three-factor randomized block field experiment was carried out with Nongxiang 42 as the test variety at the sowing date of late rice in 2022. Different water, fertilizer, chemical regulator and combination treatments were set up to determine the plant height, biomass, seedling quality and chlorophyll content of mechanized seedling casting of late rice. The results showed that water could effectively control the plant height of seedlings, but it would lead to the decline of seedling quality. Chemical regulation could effectively control the seedling height, while improving the quality of seedlings. The effects of fertilizer on seedling height and seedling quality were not obvious. Water, fertilizer and chemical regulation between any two factors and three factors had significant interaction on seedling height. The comprehensive analysis showed that under the combination of water (dry seedling raising, dry-wet alternate irrigation), fertilizer (pot soil nitrogen content 180 mg/kg, Miaozhuangfeng 60 times liquid) and chemical regulation (200 mg/L uniconazole soaking 12 hours, 15% paclobutrazol 700 times liquid spraying at one leaf and one heart stage), the plant height of seedlings could be controlled below 20 cm at the 25-day seedling age, and the seedling quality was the best at this stage.

Key words: Rice, Water management, Fertilizer management, Plant growth regulator, Mechanized casting seedling, Seedling quality, Plant height

Table 1

Test treatments and their numbers"

编号
Number		 水分处理
Water
treatment		 化控处理
Chemical control
treatment		 肥控处理
Fertilizer control
treatment
CK 湿润 不化控 不肥控
T1 旱管 不化控 不肥控
T2 湿润 化控 不肥控
T3 湿润 不化控 肥控
T4 旱管 化控 不肥控
T5 旱管 不化控 肥控
T6 湿润 化控 肥控
T7 旱管 化控 肥控

Fig.1

Plant height of 0-25 days under water, fertilizer and chemical regulation"

Fig.2

The growth rate of seedlings treated with water, fertilizer and chemical regulation for 0-25 days"

Fig.3

The difference of seedling plant height on the 25th day under water, fertilizer and chemical regulation Different lowercase letters indicate significant difference among treatments (P < 0.05), the same below."

Fig.4

The dry and fresh weight of the aboveground part of the seedlings on the 25th day under water, fertilizer and chemical regulation"

Fig.5

The dry and fresh weight of the underground part of the seedling on the 25th day under water, fertilizer and chemical regulation"

Table 2

The root index of each treatment seedling at seedling age of 25 days under water, fertilizer and chemical regulation"

处理
Treatment		 根冠比
Root-shoot
ratio		 根干鲜比
Dry-fresh
ratio of root		 根系总长度
Total root
length (cm)		 平均直径
Mean
diameter (mm)
CK 0.28c 0.28b 60.95a 0.77abc
T1 0.24c 0.16c 43.30cde 1.07a
T2 0.36ab 0.29b 45.89bcd 0.48c
T3 0.38a 0.37a 56.75ab 0.85ab
T4 0.42a 0.16c 32.54e 0.76abc
T5 0.30c 0.16c 52.99abc 0.66bc
T6 0.41a 0.27b 39.79de 0.50c
T7 0.30bc 0.17c 42.53cde 0.75c

Fig.6

The chlorophyll content at the seedling age of 25 days under the condition of water, fertilizer and chemical regulation"

Table 3

The effects of the interaction between water, fertilizer and chemical regulation on the plant height and quality of seedlings"

处理
Treatment		 株高Plant height 根冠比Root-shoot ratio 根系干鲜比Dry-fresh ratio of root
F值F-value 显著性Significance F值F-value 显著性Significance F值F-value 显著性Significance
T1 129.227 0.001** 8.157 0.011* 104.944 0.001**
T2 794.996 0.001** 25.373 0.001** 3.013 0.102ns
T3 2.769 0.116ns 2.307 0.148ns 1.975 0.179ns
T4 30.546 0.001** 1.367 0.259ns 3.269 0.089ns
T5 6.828 0.019* 12.340 0.003** 0.953 0.343ns
T6 52.385 0.001** 15.647 0.001** 4.110 0.060ns
T7 16.783 0.001** 3.687 0.073ns 4.469 0.510ns
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