Electronic Supplementary Material s49

Electronic supplementary material The critical soil P levels for crop yield, soil fertility and environmental safety in different soil types

Zhaohai Bai · Haigang Li﹡ · XueyunYang · Baoku Zhou · Xiaojun Shi · Boren Wang · Dongchu Li · Jianbo Shen · Qing Chen · Wei Qin· Oene Oenema·Fusuo Zhang Table S1. Average yield and maximum yield information of each crop of each year of all the experiment sites.

Yangling Chongqing Qiyang Haerbin

Maize t ha-1 Wheat t ha-1 Maize t ha-1 Wheat t ha-1 Maize t ha-1 Wheat t ha-1 Maize t ha-1 Wheat t ha-1

Average Maximum Average Maximum Average Maximum Average Maximum Average Maximum Average Maximum Average Maximum Average Maximum yield yield yield yield yield yield yield yield yield yield yield yield yield yield yield yield

1994 6229 6879 3414 4022 6244 6821 3021 3504 2887 4013 1947 2639 1985 7478 7785

1995 7174 7554 2463 2979 3427 4961 1460 1841 1986 6953 7500 3170 3705

1996 6323 7500 3444 4638 6915 7775 2191 2651 3806 6000 1202 1743 1988 7316 8010

1997 5030 6012 3609 4614 4890 5922 2390 3075 4273 8490 876 1311 1991 8835 9570

1998 6072 7412 5524 6888 6185 6813 2541 3585 3424 6750 866 1369 1994 7114 7716

1999 7542 8787 4700 5983 6470 7341 2431 3375 3668 6669 813 1551 1995

2000 5743 8804 5131 6154 6193 7163 2059 2813 2520 6386 734 1310 1996

2001 5268 7003 4867 6531 6806 7671 3666 5100 3906 7616 747 1202 1997 8354 9000 2002 8188 9948 7209 7770 2752 3942 3413 7088 935 2123 1998

2003 4863 5895 3946 5376 6555 7467 2826 4146 3256 7818 1012 1911 1999

2004 5641 6892 4894 6711 5809 6380 2015 2834 2323 6337 1176 2384 2000 5608 6119

2005 4799 5385 2242 3056 1968 5520 916 2052 2001

2006 5842 6776 5230 6762 8325 9343 2660 3530 2920 5520 1156 2052 2002

2007 6530 8017 4675 6218 2003 9389 10118 Figure S1 Distribution of four long-term experiment sites in China. I, Haerbin site, II, Yangling site, III, Chongqing site, IV, Qiyang site. P fertility P fertility inefficient efficient Olsen-P 5 mg/kg 21mg/kg 90 mg/kg

n y a t

d Critical level of e l l t i

e Olsen-P to crop a b i i r

y yield s

n s e o o v i i p t t

a a l g l u e n i R m h c Critical level u c a c e

of Olsen-P to l a Critical level

P fertility P of Olsen-P to P leaching P utilization P utilization efficient inefficient Low High environmental risk environmental risk Yield effect curve P fertility curve P leaching curve

Figure S2 The management strategy of regional agronomic P of acidic soil in Qiyang.