Table 2 The leaf area of Italian ryegrass.

From: Combining controlled-release urea with potassium chloride to reduce soil N/K leaching and promote growth of Italian ryegrass

Treatment

First clipping (mm2)

Second clipping (mm2)

Third clipping (mm2)

Fourth clipping (mm2)

N fertilizer type

CRU

295.72 a

542.99 a

475.30 a

171.64 a

Urea

282.67 a

614.73 a

389.57 b

57.16 b

K fertilizer rate (kg ha−1)

150

287.10 a

522.52 a

396.50 a

111.93 a

300

286.22 a

593.90 a

418.97 a

135.10 a

450

294.27 a

620.17 a

481.83 a

96.17 b

N × K interaction

Control

328.73 a

491.52 a

330.53 b

108.32 b

CRU × KCl150

289.40 a

417.61 a

381.93 b

167.86 a

CRU × KCl300

305.87 a

589.44 a

455.47 ab

184.50 a

CRU × KCl450

291.92 a

622.02 a

588.53 a

162.63 a

Urea × KCl150

284.85 a

627.56 a

411.12 b

56.07 cd

Urea × KCl300

266.57 a

598.41 a

382.47 b

85.73 bc

Urea × KCl450

296.63 a

618.39 a

375.13 b

29.76 d

Source of variance

N

0.6001

0.3835

0.0319

 < 0.0001

K

0.9588

0.5909

0.1536

0.0621

N × K

0.7394

0.4862

0.0484

0.4916

  1. Means followed by different lowercase letters in the same column were significantly different based on analyses with ANOVAs followed by Duncan tests (P < 0.05).
  2. Control no N and K fertilizer, CRU controlled-release urea, KCl potassium chloride.
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