Table 4 Effects of the interaction of the straw return method and potassium fertilizer dosage on the morphological indicators of maize stems in different ecological regions.

From: Effects of straw return with potassium fertilizer on the stem lodging resistance, grain quality and yield of spring maize (Zea mays L.)

Ecological region

Straw return method

Potassium fertilizer dosage

Plant height (cm)

Ear height (cm)

Stem diameter (mm)

Stem length (cm)

Tumochuan plain irrigation area

ST

6 K

329.72 ± 3.82a

128.17 ± 2.33a

27.58 ± 1.15a

14.40 ± 0.11a

0 K

306.03 ± 3.87c

118.29 ± 2.34c

25.41 ± 1.16c

12.95 ± 0.13c

NST

6 K

318.10 ± 4.69b

124.43 ± 2.43b

26.01 ± 0.85b

13.16 ± 0.10b

0 K

303.17 ± 3.73d

118.23 ± 3.01c

24.98 ± 0.91d

12.28 ± 0.24d

Hetao plain irrigation area

ST

6 K

340.63 ± 2.28a

133.59 ± 2.71a

29.75 ± 0.84a

14.63 ± 0.13a

0 K

309.84 ± 2.63c

120.73 ± 2.13c

27.12 ± 0.96c

13.06 ± 0.14c

NST

6 K

318.14 ± 4.35b

125.61 ± 2.09b

27.80 ± 0.86b

13.77 ± 0.18b

0 K

303.81 ± 4.68d

119.91 ± 1.76c

26.38 ± 1.11d

12.68 ± 0.19d

Lingnan warm dry zone

ST

6 K

325.24 ± 2.57a

126.27 ± 3.02a

26.61 ± 1.05a

14.35 ± 0.11a

0 K

301.11 ± 3.81c

116.08 ± 2.75c

24.32 ± 0.95c

12.84 ± 0.13c

NST

6 K

310.95 ± 4.11b

120.47 ± 1.29b

24.77 ± 0.74b

13.13 ± 0.06b

0 K

297.62 ± 3.98d

114.85 ± 1.44c

23.96 ± 0.70d

12.18 ± 0.11d

  1. Note: ST represents the straw return treatment. NST represents the non-straw-return treatment. 6 K and 0 K represent the potassium fertilizer dosages.Values are means ± standard deviation; n = 5. Values followed by different letters in a column are significant between treatments using a LSD test (P < 0.05).
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