Table 2 Effects of co-application of organic and chemical fertilizers on soil pH, SOM, DTPA-Fe and DTPA-Mn under different treatments.

From: Attenuated cadmium and arsenic enrichment in rice by co-application of organic composting and chemical fertilization

Treatment

pH

SOM

DTPA-Fe

DTPA-Mn

g·kg−1

g·kg−1

mg·kg−1

CK

6.82 ± 0.10e

50.28 ± 1.17d

0.48 ± 0.02a

52.42 ± 2.07a

NPK

6.84 ± 0.10e

50.99 ± 1.33d

0.46 ± 0.02ab

51.19 ± 1.89a

25PM

6.96 ± 0.12d

51.90 ± 1.43cd

0.41 ± 0.02bc

45.31 ± 2.15b

50PM

7.09 ± 0.12c

52.95 ± 1.19bc

0.40 ± 0.03cd

41.90 ± 1.90c

75PM

7.19 ± 0.12b

54.37 ± 1.37b

0.33 ± 0.03e

31.27 ± 1.94d

100PM

7.34 ± 0.13a

57.02 ± 1.28a

0.35 ± 0.03de

31.68 ± 1.95d

  1. Different lower-case of letters in the same soil property (column) indicated significant differences (ANOVA, P < 0.05) among different treatments, and values represented means ± standard deviation for each treatment (n = 3). DTPA-Fe: Fe concentration extracted by solution of DTPA-CaCl2-TEA, DTPA-Mn: Fe concentration extracted by solution of DTPA-CaCl2-TEA. CK: control, NPK: all N is supplied by urea, 25PM: 25% of N by pig manure compost and 75% of N by urea, 50PM: 50% of N by pig manure compost and 50% of N by urea, 75PM: 75% of N by pig manure compost and 25% of N by urea, PM: all N is supplied by pig manure compost.
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