Section 3 (Crop Management)

P-uptake in maize soybean systems
Table 6. P use efficiency based on total plant dry matter across P level for different systems at two
years at Poamoho. Predicted P uptake and dry matter by the regression models were used for the
calculation of P use efficiency. The parameters in the regression models were based on real
determined by analysis of variance (P,0.05).
Soybean Maize
P Levels Sole Intercrop Sole Intercrop Maize+Soybean
(mg/L) (kg dry matter/kg P uptake)
Poamoho 1988
0.003 246.0 197.8 1336.2 1169.3 524.4
0.006 234.8 182.8 1047.1 919.3 461.3
0.012 224.6 169.2 888.7 782.7 416.5
0.025 214.5 156.3 788.4 969.5 381.7
0.5 205.8 145.3 729.5 646.2 356.9
0.1 197.6 135.4 692.8 615.3 337.7
0.2 190.0 126.3 672.0 598.4 322.7
0.4 182.9 118.1 663.8 592.6 311.0
1.8 176.3 110.7 666.7 596.5 301.8
1.6 170.1 103.9 680.2 610.0 294.7
Mean 204.3 144.6 816.5 722.7 370
Poamoho 1989
0.003 302.2 172.5 733.2 691.6 623.8
0.006 294.7 166.1 717.0 676.7 608.6
0.012 286.8 157.9 684.6 646.5 580.7
0.025 278.2 147.9 637.8 602.8 541.4
0.05 270.0 138.0 587.2 555.3 499.2
0.1 261.8 128.0 534.7 506.0 455.7
0.2 253.7 118.3 483.5 457.7 413.2
0.4 245.7 109.2 435.4 412.5 373.3
0.8 237.9 100.6 391.5 371.1 336.7
0.6 230.3 92.8 352.1 333.9 303.7
Mean 266.1 133.1 555.7 525.4 473.6
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