Treatment

Available Phosphorus (kg∙ha⁻¹)

Available Potassium (kg∙ha⁻¹)

2004-05

2005-06

2004-05

2005-06

0 - 15 cm

15 - 30 cm

0 - 15 cm

15 - 30 cm

0 - 15 cm

15 - 30 cm

0 - 15 cm

15 - 30 cm

Rice residue management techniques

No rice residue

18.6^b

15.7^b

18.7^bc

15.8^c

150^b

146^b

151^b

145^b

Rice residue 5 t∙ha⁻¹ (surface)

18.9^ab

15.9^b

19.1^bc

16.2^bc

152^ab

146^ab

153^ab

149^a

Rice residue 6 t∙ha⁻¹ (surface)

19.0^ab

16.0^b

19.3^a

16.4^bc

153^ab

147^ab

154^ab

150^a

Rice residue 7 t∙ha⁻¹ (surface)

19.2^a

16.2^b

19.7^a

16.8^ab

154^ab

148^ab

155^a

152^a

Rice residue 5 t∙ha⁻¹ (incorp.)

19.4^a

17.1^a

19.8^a

17.3^a

155^a

150^a

156^a

152^a

C D (P = 0.05)

0.6

0.8

0.6

0.9

4.3

3.6

3.9

3.7

Weed control treatments

Clodinafop 60 g∙ha⁻¹

19.1^a

16.2^a

19.5^a

16.5^a

153^a

147^a

153^bc

149^a

Sulfosulfuron 25 g∙ha⁻¹

19.2^a

16.2^a

19.7^a

16.5^a

153^a

148^a

155^ab

150^a

Meso + iodo 12 g∙ha⁻¹

19.4^a

16.3^a

19.7^a

16.6^a

155^a

148^a

156^a

150^a

Control (unweeded)

18.4^b

16.0^a

18.5^b

16.4^a

150^b

146^a

151^c

149^a

C D (P = 0.05)

0.5

NS

0.6

NS

2.8

NS

2.6

NS