Year

pH^a

NO₃-N^b

P

Ca

Mg

Cu

Zn

B

(mg∙kg⁻¹)

2004

6.0

5

33

1175

320

1.5

2.2

1.3

2005

5.9

8

40

1165

240

1

3.0

1

2006

5.9

8

38

1258

261

1.4

1.9

2.5