Table 2 Summary of P-NMR results from selected studies

Crop

Rice

Greenhouse, double-crop tomatoes

Grain-based rotation

8-year, wheat-based rotation

Continuous monoculture wheat

Various summer crops, winter cover crop

Fertilizers

Different rice cropping systems; CF, AM, COM

CF, AM; high N fertilizer, leaching

Soil textures, fertilization rates (CF, AM)

Fertilization; 0, CF, AM, COM, SS; EH

Long-term with and without CF

Grazed and ungrazed winter cover crops, CF

Soil pH

4.64–5.82^a

6.91–7.03

5.8–7.5

4.8–5.9

5.4–6.6

5.2–6.4

Total P (mg kg⁻¹)

133–1378

685–2446

288–980

442–1150

440–615

841–2531

Soil test P (mg kg⁻¹)^b

<1–6.9 (O)

20–210 (O)

179–1128 (M)

12–223 (A)

114–58 (R)

3–33 (O)

21–103 (M)

22–71 (M)

P recovery (%)^c

36–82

49–74

48–98

73–96

36–50

60–88

OrthoP (%)^d

54–80

90.7–93.4

20.4–75.7

53–80

22.6–44.1

71.6–77.6

Pyro P (%)

0–4

0.3–0.8

0–3.2

0.3–0.5

1.0–1.4

2.0–2.3

Myo-IHP (%)

0–5

0.5–1.7

0–24

3.0–6.6

4.6–8.5

6.5–9.7

Scyllo-IHP (%)

0–4

0.1–0.3

1.4–6.6

1.0–2.7

0.8–2.7

2.9–3.9

Other mono (%)

nd^e

4.2–8.4

nd

7.3–12.2

29.3–34.2

0.7–1.1

DNA (%)

0–9

0.0–2.0

0–3

0

0.3–1.2

0.3–1.6

Other diesters (%)^f

nd

0.0–0.7

0–17.5

0.7–1.1

2.8–4.5

6.8–9.8

cM:D^g

nd

1.5–2.0

0.9–5.6

16–25

1.2–1.5

1.3–1.5