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Study on Main Agronomic Traitsand Density Tolerance of Different Maize Varieties under Dense Planting Conditions in Arid Areas of Xinjiang
YANG Jie, HAN Dengxu, WANG Yejian, Abulaiti Abula, LIANG Xiaoling, XI Haojiang, LI Mingdong, WANG Xian, WEN Liwei
2020, 57(9):
1569-1577.
DOI: 10.6048/j.issn.1001-4330.2020.09.001
【Objective】 On the basis of density tolerance coefficient, combined with the main agronomic traits, such as plant height, spike height and average yield per plant, the density tolerance of the main maize varieties planted in arid and semi-arid regions of Xinjiang were identified, screened and analyzed in the hope of providing theoretical basis and technical support for the innovation of density tolerance germplasm and the breeding of new varieties.【Method】 11 medium and late-maturing maize varieties, such as Xianyu335, Lianchuang 825 and Xinyu108, were selected as test materials in this experiment, which were the latest national, provincial, or about to be examined into national and provincial regional tests with outstanding performances. Split zone design was adopted, with density as the main treatment and variety as the secondary treatment. 2 density levels were designed (82,500 plants /hm2 and 105,000 plants /hm2). The main agronomic traits such as plant height, spike height, yield and density tolerance were analyzed and studied during the growth period.【Result】 The results showed that: with the increase of planting density, the yield of Xianyu 335 was 19,954.23 kg/hm2 under the low density condition of 82,500 plants /hm2, and that of 105,000 plants /hm2 under the high density condition was 20,131.33 kg/ hm2, and the yield reached the maximum potential under the high density condition. Domestic varieties such as Lianchuang 825, Xinyu 108, Jiushenghe 2468 and MC703 had great yield potential, but the overall yield level was lower than those of foreign varieties. The yield of Jiushenghe 2468 was 17,879.6 kg/hm2 under the low density condition of 82,500 plants/hm2, and 18,003.85 kg/hm2 under the high density condition of 105,000 plants/hm2, performing strong tightness.【Conclusion】 Combined with the comprehensive evaluation of the main agronomic characters, such as yield, plant height, spike height, yield per plant and density tolerance coefficient, Xianyu 335, Xianyu 1225 and other foreign varieties have strong density tolerance, and Lianchuang 825, Xinyu 108, Jiushenghe 2468 and other domestic varieties have better density tolerance.
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