National Certified Maize Varieties During 1999-2018: Analysis of Genetic Yield Gain and Yield Potential

doi:10.11924/j.issn.1000-6850.casb2020-0357

Abstract

Abstract:

In order to ensure the continuous increase of maize yield, we studied the genetic yield gain and yield improvement potential of maize varieties in China from 1999 to 2018. Based on the large data platform of China Seed Industry and data of China National Bureau of Statistics, we analyzed the genetic yield gain and yield potential of national certified varieties over the last two decades. The results showed that totally 933 maize varieties were registered by the large data platform over the last two decades, the average unit yield was 9984.9 kg/hm², and the annual genetic yield gain rate was 185.73 kg/hm². The actual maize average unit yield in China was 5432.96 kg/hm², which realized 54.41% of the yield potential of the national certified varieties. The regression equation between national certified varieties’ regional test unit yield and actually unit yield was y=0.3728x+1710.5, the yield of national certified varieties increased by 1 kg/hm² in regional trail, the actual cultivation yield could increase about 0.3728 kg/hm².

Key words: maize, national certified varieties, genetic yield gain, yield potential, regression analysis

CLC Number:

S338

Lu Shi, Li Mu, Gao Tingting, Wang Min, Meng Lingcong, Zheng Shubo, Lu Ming, Liu Wenguo. National Certified Maize Varieties During 1999-2018: Analysis of Genetic Yield Gain and Yield Potential[J]. Chinese Agricultural Science Bulletin, 2021, 37(21): 1-7.

Figures/Tables 9

References 38

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国审品种推广区域	回归曲线	R²
国审玉米品种	y=185.73x+8034.8	0.9097
北方春玉米区	y=191.9x+8992.4	0.8904
黄淮海夏玉米区	y=151.91x+7500.8	0.864
西南玉米区	y=85.335x+8130.8	0.5415
西北玉米区	y=270.75x-530679	0.8543
南方玉米区	y=175.26x-3432.26	0.715

国审品种推广区域	回归曲线	R²
国审玉米品种	y=185.73x+8034.8	0.9097
北方春玉米区	y=191.9x+8992.4	0.8904
黄淮海夏玉米区	y=151.91x+7500.8	0.864
西南玉米区	y=85.335x+8130.8	0.5415
西北玉米区	y=270.75x-530679	0.8543
南方玉米区	y=175.26x-3432.26	0.715

产量潜力指标	全国	北方春玉米区	黄淮海夏玉米区	西南玉米区	西北玉米区	南方玉米区
区域试验产量	9984.90	10911.42	9019.90	8898.85	14164.99	8000.29
实际单产	5432.96	5978.23	5251.65	4665.61	6472.15	4215.23
产量差	4551.94	4933.19	3768.25	4233.24	7692.84	3785.06
产量潜力	54.41%	54.78%	58.22%	52.42%	45.69%	52.68%

产量潜力指标	全国	北方春玉米区	黄淮海夏玉米区	西南玉米区	西北玉米区	南方玉米区
区域试验产量	9984.90	10911.42	9019.90	8898.85	14164.99	8000.29
实际单产	5432.96	5978.23	5251.65	4665.61	6472.15	4215.23
产量差	4551.94	4933.19	3768.25	4233.24	7692.84	3785.06
产量潜力	54.41%	54.78%	58.22%	52.42%	45.69%	52.68%