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. 2020 Jun 19;20:282. doi: 10.1186/s12870-020-02477-2

Table 2.

Maize cob length, cob number, kernel number per cob, and thousand kernel weight as affected by mulch, nitrogen fertilizer application rate, and planting density (DL: 55,000 seeds ha− 1; DH: 90,000 seeds ha− 1) in 2015, 2016, and 2017

Year Mulch Nitrogen Cob length (cm) Cob number
(ha− 1)		 Kernel number per cob Thousand kernel weight (g)
DL DH DL DH DL DH DL DH
2015 No N0 14.6 15.3 42,997 77,757 470 385 223 149
N120 16.6 16.3 48,703 79,281 555 437 276 211
N240 17.3 16.5 48,894 79,500 571 469 315 222
N360 17.2 16.5 49,023 79,953 581 465 299 240
Yes N0 15.3 14.3 45,143 76,345 473 418 214 155
N120 17.2 16.8 48,642 79,087 583 461 253 248
N240 17.6 16.9 49,284 81,562 617 485 271 255
N360 17.5 16.8 49,112 81,349 613 497 276 265
2016 No N0 15.4 15.6 45,114 77,496 484 395 234 157
N120 17.0 16.5 48,892 80,244 563 447 290 221
N240 17.6 16.8 49,151 79,772 579 482 330 233
N360 17.4 16.6 48,679 80,270 583 469 301 252
Yes N0 15.9 15.4 45,304 77,291 478 444 225 163
N120 18.0 17.1 49,151 80,691 582 459 266 261
N240 18.1 17.2 49,705 82,303 613 509 285 268
N360 17.8 17.2 50,029 82,422 594 495 289 278
2017 No N0 16.0 15.7 44,857 78,187 492 398 246 165
N120 16.9 16.7 49,651 81,211 553 448 305 232
N240 17.6 16.6 49,105 79,865 576 484 347 245
N360 17.4 16.5 49,166 79,301 591 494 335 264
Yes N0 15.4 15.2 45,633 76,469 484 447 236 171
N120 18.0 16.9 49,764 80,041 590 468 279 274
N240 17.7 17.0 49,960 81,762 615 501 299 281
N360 18.1 16.9 49,391 81,838 622 525 302 292
Treatment effect (P values) a
Year (Y) <  0.001 ns 0.008 <  0.001
Mulch (M) <  0.001 ns <  0.001 <  0.001
Nitrogen (N) <  0.001 <  0.001 <  0.001 <  0.001
Density (D) <  0.001 <  0.001 <  0.001 <  0.001
Y * M ns ns ns ns
Y * N ns ns ns ns
Y * D ns ns ns ns
M * N 0.01 ns ns <  0.001
M * D ns ns ns ns
N * D ns ns <  0.001 <  0.001
Y * M * N ns ns ns ns
Y * M * D ns ns ns ns
Y * N * D ns ns ns ns
M * N * D ns ns 0.006 ns
Y * M * N * D ns ns ns ns

ans Not significant (P > 0.05)