Table 5 Effect of long-term straw return on the equilibrium exchangeable K (EK0), equilibrium solution K (CK0) and magnitude of the conversion of added K to exchangeable K (α) and non-exchangeable K (β).

From: Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation

Treatment

EK0 cmol kg−1

α %

CK0 cmol kg−1

β %

CK

0.15

32.55

0.077

37.99

NPK

0.17

39.03

0.088

32.41

S

0.20

43.92

0.093

29.19

NPKS

0.21

48.22

0.102

25.67

  1. CK, no fertilization; NPK, mineral fertilizing; S, straw 6000 kg h m−2 and NPKS, NPK with straw 6000 kg h m−2.
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