密度和行距配置对榆林市春玉米农艺性状和产量的影响.

In order to study the effects of different density and row spacing on agronomic traits and yield of spring maize in this area,Shaandan 650 and Dafeng 30 were used as test varieties. Set up 2 lines 1 belt 40 cm + 80 cm (A), 3 lines 1 belt 40 cm + 40 cm + 120 cm (B), 3 lines 1 belt 60 cm + 60 cm + 120 cm (C), 4 lines 1 belt 40 cm +40 cm+40 cm plus 120c m (D), 4 lines 1 with 60 cm + 60 cm + 60 cm plus 120 cm wide-narrow row and control 60 cm equal row spacing (F) 6 row spacing configuration mode,two planting densities of 67 500 and 90 000 plants/hm²are set. The experimental design of the split plot of three factors was adopted, with the planting mode as the main area and the variety and density as the secondary zone, to explore the differences in agronomic traits and yield of maize under different row spacing configurations. The results showed that for the same variety, the plant height and ear height increased with the increase of density, while the stem diameter decreased with the increase of density. The plant height and ear height of the treatment of 3 rows and 1 belt (60 cm+60 cm+120 cm) were significantly higher than those of the other row spacings, the stem diameter is the opposite. Maize grain yield increased with the increase of density. The yield of 6 000 plants/hm²was obviously higher than that of 67 500 plants/hm²under the same planting pattern of the same variety. Ear diameter, ear length, row number per ear, grain number per row and 100-grain weight decreased with the increase of planting density, while bald tip length increased with the increase of planting density. The highest yield planting mode of Shaandan 650 is as follows: Under the density of 90 000 plants/hm², the yield was 18 504. 15 kg /hm²with 3 rows and one row spacing (40 cm+40 cm+120 cm); the second is 3 rows and 1 strip (60 cm+60 cm+120 cm) row spacing under the density of 90 000 plants/hm², the yield is 17 768. 55 kg /hm²;the highest yield of Dafeng 30 was 19 421. 40 kg /hm²under the planting density of 90 000 plants/hm²with 3 rows and 1 belt (60 cm+60 cm+120 cm). [ABSTRACT FROM AUTHOR]