Crops ›› 2021, Vol. 37 ›› Issue (6): 72-77.doi: 10.16035/j.issn.1001-7283.2021.06.012

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Study on the Technique of Removing False Hybrids from Foxtail Millet Herbicide-Resistant Hybrids

Li Huixia1(), Liu Hong1, Wang Yuwen1, Tian Gang1, Liu Xin1, Zheng Zhiyin2   

  1. 1Millet Research Institute, Shanxi Agricultural University, Changzhi 046011, Shanxi, China
    2College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, Qinghai, China
  • Received:2020-12-17 Revised:2021-01-06 Online:2021-12-15 Published:2021-12-16

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Abstract:

Currently, most of the sterile lines used in foxtail millet hybrids belong to highly male sterile lines with 5%-10% self-fertility. Therefore, there will be a certain proportion of false hybrids in foxtail millet two-line hybrids. The traditional method of removing false hybrids is spraying herbicides at the seedling stage. To find a simple, safe, and effective way to remove false hybrids, two herbicides of sethoxydim and imazethapyr with six concentrations (0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.4%) were used to soak seeds in 2019 to find the optimal concentration. The best method of seed drying was selected by drying the seeds in the shade, in the sun, and in the oven. The experiment of combined application of herbicides (six concentration treatments) and coating agent (three concentration treatments) was set in 2020. The test results were as follows: in seed soaking experiment, the herbicide treatments with concentration of 0.8% (especially drying in the shade and oven after soaking evenly) had the best effects on removing false hybrids. In coating experiment, the treatment of 50g coating agent + 4-5mL sethoxydim coating 2.5kg seeds was best for Changzagu 466 (resistant sethoxydim hybrid), and the treatment of 50g coating agent + 3mL imazethapyr coating 2.5kg seeds was best for Changzagu 2922 (resistant imazethapyr hybrid).

Key words: Foxtail millet, Two-line hybrid, Herbicide, False hybrid

Table 1

Analysis of the effects of removing false hybrids on Changzagu 466 treated by sethoxydim"

处理浓度
Treatment
concentration
(%)		 大田试验Field experiment 盆栽试验Pot experiment
总苗数
Seedling
number		 假杂种
苗数
False
hybrid
number		 假杂种
出苗率
False
hybrid
rate (%)		 真杂种
苗数
True
hybrid
number		 真杂种
出苗率
True
hybrid
rate (%)		 总苗数
Seedling
number		 假杂种
苗数
False
hybrid
number		 假杂种
出苗率
False
hybrid
rate (%)		 真杂种
苗数
True
hybrid
number		 真杂种
出苗率
True
hybrid
rate (%)
0.2 316.0 108.5 10.85a 207.5 20.75ab 110.5 37.5 18.75a 73.0 36.50a
0.4 303.0 91.0 9.10b 212.0 21.20ab 100.5 32.0 16.00ab 68.5 34.25ab
0.6 阴干 238.0 45.0 4.50c 193.0 19.30bc 74.0 12.0 6.00bc 62.0 31.00b
晒干 231.5 41.0 4.10c 190.5 19.05bc 77.0 22.5 11.25b 54.5 27.25c
烘干 237.5 30.5 3.05c 207.0 20.70ab 82.0 11.0 5.50bc 71.0 35.50ab
0.8 阴干 225.0 10.5 1.05d 214.5 21.45ab 79.0 4.5 2.25c 74.5 37.25a
晒干 207.5 15.5 1.55d 192.0 19.20bc 63.0 12.0 6.00bc 51.0 25.50c
烘干 209.5 6.0 0.60d 203.5 20.35b 71.0 1.5 0.75c 69.5 34.75ab
1.0 181.0 6.0 0.60d 175.0 17.50c 64.0 3.0 1.50c 61.0 30.50b
1.4 184.0 3.0 0.30d 181.0 18.10c 66.0 1.0 0.50c 65.0 32.50b
CK1 565.5 338.0 33.80 227.5 22.75a 184.0 114.0 57.00 70.0 35.00ab
备注Note 总出苗率56.55%,真杂种率40.23% 总出苗率92.00%,真杂种率38.04%

Table 2

Analysis of the effects of removing false hybrids on Changzagu 2922 treated by imazethapyr"

处理浓度
Treatment
concentration
(%)		 大田试验Field experiment 盆栽试验Pot experiment
总苗数
Seedling
number		 假杂种
苗数
False
hybrid
number		 假杂种
出苗率
False
hybrid
rate (%)		 真杂种
苗数
True
hybrid
number		 真杂种
出苗率
True
hybrid
rate (%)		 总苗数
Seedling
number		 假杂种
苗数
False
hybrid
number		 假杂种
出苗率
False
hybrid
rate (%)		 真杂种
苗数
True
hybrid
number		 真杂种
出苗率
True
hybrid
rate (%)
0.2 166.0 62.0 6.20b 104.0 10.40ab 63.0 24.0 12.00a 39.0 19.50a
0.4 123.5 28.5 2.85b 95.0 9.50b 43.5 10.5 5.25b 33.0 16.50a
0.6 阴干 115.0 14.0 1.40d 101.0 10.10b 41.0 6.0 3.00bc 35.0 17.50a
晒干 175.5 77.5 7.75a 98.0 9.80b 63.0 27.0 13.50a 36.0 18.00a
烘干 128.5 11.0 1.10de 117.5 11.75ab 43.5 3.0 1.50c 40.5 20.25a
0.8 阴干 119.0 9.0 0.90de 110.0 11.00ab 41.5 4.0 2.00bc 37.5 18.75a
晒干 121.5 18.5 1.85cd 103.0 10.30ab 46.5 7.5 3.75bc 39.0 19.50a
烘干 102.5 1.0 0.10e 101.5 10.15b 37.0 0.5 0.25c 36.5 18.25a
1.0 57.5 0.0 0.00e 57.5 5.75c 16.0 0.0 0.00c 16.0 8.00b
1.4 39.5 2.0 0.20e 37.5 3.75c 8.0 1.0 0.50c 7.0 3.50b
CK2 518.5 389.0 38.90 129.5 12.95a 178.0 133.5 66.75 44.5 22.25a
备注Note 总出苗率51.85%,真杂种率24.98% 总出苗率89.00%,真杂种率25.00%

Table 3

Analysis of the effects of herbicide dispensing with coating agent on the treatment of false hybrids coating"

处理
Treatment		 大田试验Field experiment 盆栽试验Pot experiment
总苗数
Seedling
number		 假杂种
苗数
False
hybrid
number		 假杂种
出苗率
False
hybrid
rate (%)		 真杂种
苗数
True
hybrid
number		 真杂种
出苗率
True
hybrid
rate (%)		 总苗数
Seedling
number		 假杂种
苗数
False
hybrid
number		 假杂种
出苗率
False
hybrid
rate (%)		 真杂种
苗数
True
hybrid
number		 真杂种
出苗率
True
hybrid
rate (%)
N1 258.0 3.5 0.35a 254.5 25.45a 128.0 33.0 16.50a 95.0 47.50b
N2 232.5 4.0 0.40a 228.5 22.85a 97.5 4.5 2.25b 93.0 46.50b
N3 259.5 5.0 0.50a 254.5 25.45a 101.0 3.5 1.75b 97.5 48.75b
N4 254.0 4.0 0.40a 250.0 25.00a 102.0 4.5 2.25b 97.5 48.75b
N5 222.5 5.0 0.50a 217.5 21.75a 91.0 1.0 0.50b 90.0 45.00bc
N6 224.0 3.0 0.30a 221.0 22.10a 83.0 1.5 0.75b 81.0 40.50c
CK1 478.0 204.5 20.45 273.5 27.35a 196.0 83.0 41.50 113.0 56.50a
M1 198.0 0.0 0.00a 198.0 19.80a 42.5 3.5 1.75a 39.0 19.50ab
M2 143.0 0.0 0.00a 143.0 14.30b 35.0 3.0 1.50a 32.0 16.00b
M3 123.0 1.0 0.10a 122.0 12.20b 24.0 1.0 0.50a 23.0 11.50b
CK2 560.0 359.5 35.95 200.5 20.05a 190.0 141.5 70.75 48.5 24.25a
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