Table 12 Postharvest soil and straw potassium-related indicators under different straw return methods and potassium fertilizer treatments.

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

Straw potassium accumulation content (kg/hm2)

Soil available potassium content (mg/kg)

Tumochuan plain irrigation area

ST

6 K

204.04 ± 7.58a

124.60 ± 5.76a

0 K

159.56 ± 8.84c

110.90 ± 3.44c

NST

6 K

180.71 ± 7.82b

116.08 ± 6.95b

0 K

151.30 ± 7.94d

105.72 ± 4.92d

Hetao plain irrigation area

ST

6 K

242.81 ± 13.53a

149.08 ± 7.00a

0 K

184.84 ± 9.85c

129.28 ± 3.40c

NST

6 K

198.79 ± 10.36b

138.04 ± 5.62b

0 K

171.59 ± 7.78d

121.66 ± 3.77d

Lingnan warm dry zone

ST

6 K

184.95 ± 13.69a

119.08 ± 3.57a

0 K

148.39 ± 11.20c

106.38 ± 4.42c

NST

6 K

163.18 ± 12.87b

109.78 ± 4.14b

0 K

138.98 ± 11.96d

99.58 ± 3.67d

  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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