Table 2 Effective accumulated temperature in machine-transplanted double-cropped rice grown under different sowing periods in 2015 and 2016.

From: Elastic sowing dates with low seeding rate for grain yield maintenance in mechanized large-scale double-cropped rice production

Season

Cultivar

Sowing date delay (days)

Effective accumulated temperature (°C)

SO to TP

TP to FH

FH to MA

Total

2015 ER

ZZ39

+0

126

673

475

1274

  

+5

117

670

493

1281

  

+10

136

699

506

1341

  

+15

197

692

475

1364

2016 ER

ZZ39

 + 0

145

749

457

1351

  

+5

154

763

476

1392

  

+10

144

781

487

1412

  

+15

145

751

533

1429

 

LLY268

 + 0

145

847

434

1425

  

+5

154

846

468

1468

  

+10

144

846

524

1514

  

+15

145

836

560

1540

  

+0

139 ± 11a

756 ± 88a

455 ± 21b

1350 ± 76a

  

+5

142 ± 21a

760 ± 88a

479 ± 13ab

1380 ± 94a

  

+10

141 ± 5a

775 ± 74a

506 ± 19a

1422 ± 87a

  

+15

162 ± 30a

760 ± 72a

523 ± 43a

1444 ± 89a

  

LSD0.05

36

152

50

163

2015 LR

HY518

 + 0

336

985

376

1697

  

+5

307

1033

448

1788

  

+10

314

915

430

1659

  

+15

343

839

423

1605

  

+20

351

887

316

1553

2016 LR

HY518

 + 0

272

1039

500

1811

  

+5

287

1035

467

1789

  

+10

300

985

432

1718

  

+15

319

925

395

1639

  

+20

323

925

340

1588

 

TY390

 + 0

272

1091

482

1845

  

+5

287

1095

444

1826

  

+10

300

1037

423

1761

  

+15

319

1018

364

1701

  

+20

323

992

357

1671

  

+0

293 ± 37b

1038 ± 53ab

453 ± 67a

1784 ± 78a

  

+5

294 ± 12b

1054 ± 35a

453 ± 12a

1810 ± 22a

  

+10

305 ± 8ab

979 ± 61ab

428 ± 5a

1713 ± 51ab

  

+15

327 ± 14ab

927 ± 90b

394 ± 30ab

1648 ± 49bc

  

+20

332 ± 16a

935 ± 53b

338 ± 21b

1604 ± 61c

  

LSD0.05

37

111

63

100

  1. SO, sowing stage; TP, transplanting stage; FH, full heading stage; MA, mature stage. LSD, least significant difference at a significance level of P < 0.05.
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