Table A1.

The spatial distribution of fertilizer at 20 plots during the growth of maize. The NPK meant different combinations of fertilizers, and N represented the nitrogenous fertilizer, P represented the phosphate fertilizer, K represented the potassium fertilizer, respectively. The number after NPK represents the actual multiple of fertilizer fertilizers, and the numbers in brackets were the number of plots in corresponding with the plots shown in Figure A1.

	Column 1	Column 2	Column 3	Column 4
Row 1	N2+straw (4)	N3P3K1 (3)	N3P1K1 (2)	N1P1K2 (1)
Row 2	N2+Organic fertilizer (8)	N3P2K1 (7)	N3P3K2 (6)	N1P1K1 (5)
Row 3	N3+straw (12)	N4P3K1 (11)	N2P2K2 (10)	N1P2K1 (9)
Row 4	N3+Organic fertilizer (16)	N4P2K1 (15)	N2P1K1 (14)	N1P3K1 (13)
Row 5	N4P2K2 (20)	N4P1K1 (19)	N2P2K1 (18)	N2P3K1 (17)