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Acta Agronomica Sinica ›› 2019, Vol. 45 ›› Issue (11): 1691-1698.doi: 10.3724/SP.J.1006.2019.94029

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of plant density and N fertilizer spraying concentration on growth of rapeseed blanket seedlings

ZHANG Han-Xiao1,LIN Shen2,ZUO Qing-Song1,YANG Guang1,FENG Qian-Nan1,FENG Yun-Yan1,LENG Suo-Hu1,*()   

  1. 1 Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, Jiangsu, China
    2 Jiangsu Tianfeng Seed Co. Ltd, Huai’an 223001, Jiangsu, China;
  • Received:2019-02-26 Accepted:2019-06-22 Online:2019-11-12 Published:2019-06-22
  • Contact: Suo-Hu LENG E-mail:oilseed@yzu.edu.cn
  • Supported by:
    This study was supported by the National Key Research and Development Program of China(2018YFD0200905)

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Abstract:

In order to explore the effects of sowing density and N fertilizer on the key biological indicators of rapeseed blanket seedlings, the cultivation methods of rapeseed blanket seedlings suitable for mechanical transplantation were studied. In this paper, Ningza 1818, a Brassica napus variety, was used to analyze the effect of sowing density and N fertilizer spraying concentration on some important morphological and physiological indicators, including number of survival plants, number of green leaves, dry matter accumulation, ratio of shoot to root and so on. With the increase of sowing density, the number of survival plants, the number of leaves and green leaves decreased. High sowing density reduced dry matter accumulation of shoots and roots, and that of roots had a greater decline, resulting in a decreased ratio of shoot to root. At the same time, the root collar length and plant height increased, and seedling fullness decreased. With the increase of N fertilizer spraying concentration, the above indicators were optimized. Under the low sowing density condition, the quality of blanket seedlings was improved, however, it was not conducive to forming the good blanket of seedlings and transplanting, and the transplanting density could not be guaranteed. Therefore, considering the quality of blanket seedlings and the effect of mechanized transplanting, the combination of the nutrient solution of 3 g urea L -1 and sowing density of 800 seed plate -1 is reasonable to cultivate rapeseed blanket seedlings when the seedling age of late rice stubble is about 30-40 days.

Key words: rapeseed blanket seedling, sowing density, N fertilizer spraying concentration, seedling quality, number of green leaves

Table 1

Effect of planting density and N rate on survival and death blanket rapeseed seedings during process of growth"

密度
Density (Seed plate-1)		 施肥浓度
Nitrogen (g L-1)		 存苗数 Number of survival plants 死苗数Number of death plants
20 d 30 d 40 d 20 d 30 d 40 d
400 1 378.12 j 375.48 k 367.48 i 14.72 gh 17.36 j 25.36 l
2 380.20 j 378.24 k 372.24 i 13.19 h 15.15 j 21.15 l
3 384.20 j 382.56 k 377.52 i 10.43 h 12.07 j 17.11 l
600 1 563.14 i 550.50 j 535.50 h 25.44 f 38.08 gh 53.08 i
2 567.18 hi 556.45 ij 545.48 h 22.44 fg 33.17 hi 44.14 ij
3 574.70 h 567.78 i 558.84 h 17.17 g 24.09 ij 33.03 jk
800 1 731.52 g 710.12 h 657.52 g 48.42 c 69.82 d 122.42 f
2 740.24 fg 723.28 h 683.28 fg 41.94 d 58.90 f 98.90 g
3 754.00 f 742.44 g 712.48 ef 32.32 e 43.88 g 73.84 h
1000 1 908.50 e 827.90 f 717.60 e 57.50 b 138.10 b 248.40 b
2 921.00 de 854.10 e 773.60 d 49.21 c 116.11 c 196.61 c
3 940.30 d 892.20 d 831.67 c 36.82 d 84.92 d 145.45 e
1200 1 1059.96 c 956.36 c 820.36 c 68.64 a 172.24 a 308.24 a
2 1080.00 b 996.92 b 903.36 b 58.44 b 141.52 b 235.08 b
3 1109.64 a 1053.52 a 985.04 a 43.08 d 99.20 e 167.68 d

Table 2

Effect of planting density and N rate on number of leaves and green leaves during the blanket rapeseed growth process"

密度
Density
(Seed plate-1)		 施肥浓度
Nitrogen
(g L-1)		 出叶数 The number of leaves 绿叶数 The number of green leaves
20 d 30 d 40 d 20 d 30 d 40 d
400 1 2.36 d 3.59 e 4.38 d 2.36 d 3.26 d 3.28 d
2 2.60 bc 4.26 b 4.96 b 2.60 bc 3.83 b 4.05 b
3 2.93 a 4.86 a 5.68 a 2.93 a 4.18 a 4.51 a
600 1 2.28 d 3.46 e 4.20 d 2.28 d 3.19 de 3.20 de
2 2.50 bc 4.17 bc 4.78 b 2.50 bc 3.77 b 3.85 b
3 2.87 a 4.60 a 5.55 a 2.87 a 4.05 a 4.22 a
800 1 2.20 de 3.40 e 3.96 g 2.20 de 3.12 e 2.88 f
2 2.41 d 3.93 c 4.56 c 2.41 d 3.32 d 3.36 d
3 2.67 b 4.30 b 5.12 b 2.67 b 3.87 b 3.93 b
1000 1 2.15 ef 3.23 f 3.73 e 2.15 ef 2.88 f 2.62 g
2 2.33 d 3.76 d 4.31 d 2.33 d 3.22 de 3.03 e
3 2.54 bc 4.13 c 4.45 c 2.54 bc 3.51 c 3.53 c
1200 1 2.03 f 3.12 f 3.56 e 2.03 f 2.83 f 2.46 g
2 2.23 d 3.62 d 4.22 d 2.26 d 3.15 e 2.93 e
3 2.46 c 3.86 c 4.33 d 2.46 c 3.22 de 3.15 de

Table 3

Effect of planting density and N rate on agronomic traits of the blanket rapeseed seedings during process of growth"

密度
Density
(Seed plate-1)		 施肥浓度Nitrogen
(g L-1)		 根颈长
Root collar length (cm)		 苗高
Plant height (cm)		 叶长
Leaf length (cm)
20 d 30 d 40 d 20 d 30 d 40 d 20 d 30 d 40 d
400 1 1.33 h 1.34 f 1.35 h 4.74 i 7.75 g 8.85 h 1.39 fg 2.14 fg 2.79 efg
2 1.37 g 1.38 e 1.38 g 5.23 g 8.04 f 9.06 g 1.74 bc 2.52 c 3.08 bc
3 1.40 ef 1.41 e 1.42 f 5.47 f 8.52 d 9.52 e 2.03 a 2.86 a 3.37 a
600 1 1.35 h 1.36 f 1.36 g 5.15 h 7.78 g 8.96 h 1.38 fg 2.11 fg 2.73 efg
2 1.40 efg 1.42 e 1.42 f 5.73 g 8.12 ef 9.33 f 1.70 bcd 2.43 cd 3.00 cd
3 1.45 ef 1.48 d 1.47 e 6.05 ef 8.66 d 9.70 e 1.96 a 2.73 a 3.25 ab
800 1 1.38 g 1.41 e 1.41 f 5.25 h 7.97 ef 9.89 de 1.28 gh 2.08 g 2.64 gh
2 1.45 ef 1.51 d 1.51 d 5.88 g 8.41 d 10.42 d 1.57 de 2.37 d 2.87 de
3 1.52 c 1.63 c 1.67 c 6.36 e 8.87 c 10.73 c 1.77 b 2.65 b 3.04 cd
1000 1 1.40 efg 1.50 d 1.53 d 5.76 f 8.25 e 10.13 c 1.21 gh 1.96 h 2.48 hi
2 1.53 c 1.62 c 1.67 c 6.58 cd 8.80 c 10.75 c 1.44 ef 2.19 ef 2.67 fgh
3 1.60 b 1.71 b 1.72 bc 6.99 ab 9.64 b 11.46 ab 1.61 bcd 2.41 d 2.82 ef
1200 1 1.45 d 1.58 c 1.58 d 5.85 f 8.36 e 10.35 c 1.19 h 1.90 h 2.36 i
2 1.58 bc 1.73 ab 1.73 ab 6.73 bc 8.98 c 11.04 bc 1.38 f 2.11 fg 2.51 hi
3 1.67 a 1.81 a 1.81 a 7.18 a 9.93 a 11.9 4a 1.53 d 2.30 e 2.63 fgh

Table 4

Effect of planting density and N rate on overground and underground part dry weight of the blanket rapeseed seedings during process of growth"

密度
Density
(Seed plate-1)		 施肥浓度
Nitrogen
(g L-1)		 地上干物重
Dry weight of shoots (mg plant-1)		 地下干物重
Dry weight of roots (mg plant-1)
20 d 30 d 40 d 20 d 30 d 40 d
400 1 26.3 f 58.1 f 77.6 f 1.6 c 5.1 e 8.6 ef
2 32.1 bc 64.6 c 87.2 c 2.2 b 6.5 b 9.7 cd
3 35.5 a 70.7 a 93.6 a 2.5 a 7.6 a 12.6 a
平均 Mean 31.3 64.5 86.1 2.1 6.4 10.3
600 1 25.9 f 57.9 ef 77.4 f 1.5 cd 4.9 ef 8.0 fg
2 31.3 c 63.3 c 85.9 d 2.0 b 6.1 c 9.5 d
3 34.8 a 69.7 ab 92.6 ab 2.3 a 7.1 ab 11.7 ab
平均 Mean 30.7 63.6 85.3 1.9 6.0 9.7
800 1 25.6 f 57.5 ef 77.1 g 1.4 d 4.6 g 7.9 g
2 30.8 c 62.7 c 85.1 e 1.8 c 5.7 d 9.3 d
3 33.5 b 68.1 b 92.8 ab 2.1 b 6.2 c 11.5 b
平均 Mean 30.0 62.8 85.0 1.8 5.5 9.6
1000 1 23.4 i 54.9 g 75.5 e 1.1 g 4.1 h 7.6 gh
2 27.3 g 59.9 e 80.0 d 1.3 e 4.8 f 8.4 e
3 30.1 d 66.1 c 87.8 c 1.6 c 5.6 d 9.6 cd
平均 Mean 26.9 60.3 81.1 1.3 4.8 8.5
1200 1 22.4 j 53.6 h 74.6 e 1.1 g 3.5 i 7.1 h
2 25.8 h 58.6 f 79.0 d 1.2 f 4.1 h 7.7 gh
3 28.1 e 61.9 d 86.1 d 1.5 cd 4.8 f 8.7 e
平均 Mean 25.4 58.0 79.9 1.3 4.1 7.8

Table 5

Effect of planting density and N rate on ratio of shoot to root and seedling fullness of blanket rapeseed seedings during process of growth"

密度
Density (Seed plate-1)		 施肥浓度
Nitrogen (g L-1)		 根冠比Ratio of shoot to root 充实度Seedling fullness (mg cm-1)
20 d 30 d 40 d 20 d 30 d 40 d
400 1 0.061 d 0.088 e 0.111 c 0.555 c 0.750 d 0.877 d
2 0.069 ab 0.101 ab 0.111 c 0.613 ab 0.803 ab 0.962 ab
3 0.070 a 0.107 a 0.135 a 0.649 a 0.830 a 0.983 a
600 1 0.058 e 0.085 ef 0.103 d 0.503 f 0.744 de 0.864 d
2 0.063 c 0.096 c 0.111 c 0.546 d 0.779 bc 0.921 c
3 0.066 b 0.102 b 0.126 b 0.575 b 0.805 ab 0.955 b
800 1 0.055 f 0.080 f 0.102 d 0.488 fg 0.722 e 0.780 f
2 0.058 e 0.087 e 0.109 c 0.524 e 0.745 d 0.817 ef
3 0.063 c 0.091 d 0.124 b 0.527 e 0.768 c 0.865 d
1000 1 0.047 i 0.075 hi 0.101 f 0.406 j 0.666 h 0.745 h
2 0.048 hi 0.080 f 0.105 e 0.415 i 0.681 g 0.744 h
3 0.053 g 0.085 ef 0.109 c 0.431 h 0.686 f 0.766 g
1200 1 0.049 hi 0.065 j 0.095 f 0.383 k 0.641 i 0.721 i
2 0.047 i 0.070 i 0.097 e 0.383 k 0.653 ij 0.716 ij
3 0.053 g 0.078 gh 0.101 d 0.391 j 0.623 j 0.721 i
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