Table 10 Maize yield and yield component factors under different straw return methods and potassium fertilizer treatments.
Ecological region | Straw return method | Potassium fertilizer dosage | Spike number (fringes/hm2) | Grain number per ear (grains/fringe) | 1000-grain weight (g) | Water content (%) | Yield (kg/hm2) | Variation coefficient |
|---|---|---|---|---|---|---|---|---|
Tumochuan plain irrigation area | ST | 6 K | 79,473 ± 814.81a | 615.48 ± 15.29a | 357.90 ± 14.12a | 18.97 ± 0.40d | 14,181.86 ± 608.93a | 4.29 |
0 K | 79,902 ± 453.16a | 583.80 ± 14.00c | 312.36 ± 13.59c | 19.66 ± 0.38b | 11,705.04 ± 584.26c | 4.99 | ||
NST | 6 K | 80,682 ± 973.64a | 597.12 ± 15.07b | 328.50 ± 11.41b | 19.48 ± 0.37c | 12,746.54 ± 665.25b | 5.22 | |
0 K | 79,920 ± 1950.49a | 578.20 ± 14.52d | 303.76 ± 13.01d | 19.76 ± 0.39a | 11,263.54 ± 645.34d | 5.73 | ||
Hetao plain irrigation area | ST | 6 K | 79,842 ± 528.46a | 632.20 ± 13.73a | 392.46 ± 14.70a | 18.75 ± 0.31d | 16,091.95 ± 575.74a | 3.58 |
0 K | 79,359 ± 986.05a | 593.32 ± 14.46c | 342.18 ± 18.76c | 19.56 ± 0.41b | 12,949.52 ± 554.12c | 4.28 | ||
NST | 6 K | 79,566 ± 671.79a | 606.76 ± 14.87b | 347.30 ± 11.79b | 19.37 ± 0.37c | 13,519.84 ± 608.29b | 4.50 | |
0 K | 78,924 ± 751.09a | 587.16 ± 11.61d | 325.28 ± 14.68d | 19.74 ± 0.42a | 12,096.89 ± 599.79d | 4.96 | ||
Lingnan warm dry zone | ST | 6 K | 80,256 ± 672.71a | 604.64 ± 15.99a | 326.78 ± 12.21a | 19.17 ± 0.37d | 12,815.56 ± 571.99a | 4.46 |
0 K | 80,313 ± 994.61a | 577.36 ± 17.97c | 294.12 ± 12.48c | 19.74 ± 0.41b | 10,945.03 ± 585.23c | 5.35 | ||
NST | 6 K | 79,935 ± 1927.75a | 588.84 ± 14.57b | 306.24 ± 12.86b | 19.54 ± 0.43c | 11,598.04 ± 660.44b | 5.69 | |
0 K | 79,452 ± 2043.51a | 571.48 ± 15.66d | 284.02 ± 12.44d | 19.89 ± 0.42a | 10,333.19 ± 646.47d | 6.26 |
