宁南山区不同玉米生长及产量对密度的响应.

【Objective】 This study aimed to further clarify the mechanism of reasonable dense planting and yield increase of spring maize in dryland of the Loess Plateau in southern Ningxia and provide theoretical and technical support for high-yielding cultivation of maize in arid and semi-arid regions. 【Method】 In this experiment, a randomized block design method was used, two large-scale maize varieties, Dafeng 30 and Xianyu 698 were used as the test materials, and five density gradients were set to study the planting density of the major agronomic traits of the maize cultivars, including traits, dry matter accumulation, yield and yield-related traits, etc. 【Result】 With the increase of the density, plant height and ear height of different maize varieties gradually increased. Dry matter accumulation gradually increased with the advancement of the growing period, and the dry matter accumulation of the two varieties reached a maximum at the ripening stage. The leaf area index of the population increases gradually with the increase of the density. The relative chlorophyll content gradually decreased with the increase of the density. With the increase of the density, the ear weight, ear diameter, grain number per row, grain weight per ear, grain weight per hectare, yield of the two varieties increased first and then decreased, and the baldness rate decreased first and then increased. Both varieties were at the output of 67 500 plants/hm2, the highest yield was achieved, which was an increase of 73.39 % and 36.26 % over the 52 500 plants/hm2. 【Conclusion】 Under the conditions of this experiment, the suitable density of Dafeng 30 and Xianyu 698 was 67 500 plants/hm2. [ABSTRACT FROM AUTHOR]