Treatment

Organic carbon(g∙kg⁻¹)

Available Nitrogen (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

4.0^d

3.0^c

3.9^c

3.0^c

224^b

171^b

226^b

172^b

Rice residue 5 t∙ha⁻¹ (surface)

4.2^c

3.1^b

4.3^b

3.2^b

227^ab

172^ab

233^a

176^a

Rice residue 6 t∙ha⁻¹ (surface)

4.3^bc

3.1^b

4.4^ab

3.2^b

228^ab

173^ab

234^a

176^a

Rice residue 7 t∙ha⁻¹ (surface)

4.4^b

3.1^b

4.5^ab

3.2^b

230^ab

174^ab

235^a

177^a

Rice residue 5 t∙ha⁻¹ (incorp.)

4.6^a

3.3^a

4.6^a

3.5^a

234^a

176^a

237^a

177^a

C D (P = 0.05)

0.2

0.1

0.3

0.2

8.0

4.7

6.9

4.0

Weed control treatments

Clodinafop 60 g∙ha⁻¹

4.3^a

3.1^a

4.3^a

3.2^a

229^ab

173^ab

233^a

175^ab

Sulfosulfuron 25 g∙ha⁻¹

4.3^a

3.2^a

4.4^a

3.2^a

228^ab

173^ab

235^a

176^ab

Meso + iodo 12 g∙ha⁻¹

4.4^a

3.2^a

4.4^a

3.3^a

231^a

175^a

236^a

177^a

Control

4.2^a

3.0^a

4.3^a

3.1^a

227^b

172^b

228^b

174^b

C D (P = 0.05)

NS

NS

NS

NS

3.7

2.8

4.2

2.9