Table 3 Significance of the effects of straw return methods, potassium fertilization levels and their interactions on maize growth and yield using ANOVA.

From: Potentials of straw return and potassium supply on maize (Zea mays L.) photosynthesis, dry matter accumulation and yield

Year

Source

Pn (μmol·m-2·s-1)

Gs (mmol·m-2·s-1)

Tr (mmol·m-2·s-1)

Ci (μmol·mol-1)

Dry matter in R1 (kg/ha)

Dry matter in R6 (kg/ha)

Yield (kg/ha)

2018

S

31.2**

24.28**

76.15**

6.6*

9.24**

11.01**

2.21 ns

K

51.14**

67.78**

195.24**

10.74**

20.21**

34.07**

7.71**

S × K

5.93**

1.09 ns

9.13**

0.34 ns

0.79 ns

0.24 ns

0.07 ns

2019

S

12.45**

27.71**

45.74**

4.66*

5.55*

9.46**

4.89*

K

14.49**

114.66**

115.35**

14.14**

13.76**

28.22**

14.59**

S × K

2.13 ns

0.53 ns

4.17*

0.32 ns

0.54 ns

0.22 ns

0.24 ns

2020

S

27.55**

22.23**

38.02**

6.91*

6.48*

13.93**

6.29*

K

40.02**

92.37**

77.3**

22.09**

19.06**

45.56**

16.02**

S × K

4.03*

0.17 ns

3.27*

0.32 ns

1.23 ns

0.89 ns

0.26 ns

  1. Numbers were F-values. Stars indicated the level of significance (* = p < 0.05, ** = p < 0.01), ns represented insignificant. S represented straw return methods, including SF and FG; K represented potassium fertilization levels, including K0, K30, K45, K60 kg/ha.
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