Table 3 Soil enzymes as affected by N fertilizer and green manures. Data are means  ±  standard errors.

From: Increase phosphorus availability from the use of alfalfa (Medicago sativa L) green manure in rice (Oryza sativa L.) agroecosystem

 

Dehydrogenase (INTF mg kg−1 24 h−1)

Urease (NH4+-N mg kg−1 4 h−1)

Acid phosphatase (p-nitrophenol mg kg−1 2 h−1)

β-glucosidase (p-nitrophenol mg kg−1 2 h−1)

2012

 Control

9.61 ± 0.42 cd

216.73 ± 9.58b

396.75 ± 1.48d

207.62 ± 8.33b

 Alfalfa

13.30 ± 0.30a

258.72 ± 4.81ab

451.24 ± 14.08abc

254.83 ± 9.95a

 Broad bean

10.86 ± 0.43bc

237.64 ± 23.28b

463.5 ± 5.58ab

251.30 ± 18.19a

 N fertilizer

9.02 ± 0.50d

230.05 ± 11.25b

436.25 ± 4.51c

193.23 ± 8.79b

 Alfalfa + N

11.23 ± 0.88b

296.98 ± 17.42a

470.26 ± 1.76a

269.00 ± 14.48a

 Broad bean + N

10.23 ± 0.38bcd

248.72 ± 7.14b

445.52 ± 5.51bc

247.47 ± 13.70a

2014

 Control

11.50 ± 0.68bc

193.95 ± 0.90d

428.35 ± 5.49c

208.18 ± 12.14bc

 Alfalfa

13.25 ± 0.83a

223.57 ± 9.63abc

451.08 ± 9.48a

220.96 ± 15.73b

 Broad bean

11.82 ± 0.50abc

220.01 ± 6.73bc

440.77 ± 8.86abc

264.56 ± 8.73a

 N fertilizer

10.97 ± 0.46c

213.09 ± 3.14 cd

430.43 ± 5.18bc

182.38 ± 13.44c

 Alfalfa + N

12.82 ± 0.21ab

242.85 ± 8.32a

460.05 ± 3.83a

261.14 ± 6.51a

 Broad bean + N

11.56 ± 0.46abc

239.71 ± 8.91ab

449.26 ± 1.57ab

240.82 ± 12.27ab

  1. The different letters in the same column in the same year are significant (P < 0.05).