Section 3 (Crop Management)

Rajbhandari
Table 5. P use efficiency (grain yield / P) level for different systems at two years at Poamoho.
Predicted P uptake and grain yield from the regression analysis (Appendix 9) were used for the
calculation of P use efficiency. The parameters in the regression models were based on real effects
determined by analysis of varience (P,0.05).
Soybean Maize
P Levels Sole Intercrop Sole Intercrop Maize +Soybean
(mg/L) (kg grain yield/kg P uptake)
Poamoho 1988
0.003 67.9 59.4 333.3 298.9 139.9
0.006 65.7 54.5 262.6 236.2 123.2
0.012 63.6 50.0 224.0 202.1 111.3
0.025 61.5 45.8 199.8 180.8 102.1
0.05 59.6 42.3 185.7 168.5 95.6
0.1 57.8 39.0 177.2 161.2 90.5
0.2 56.1 36.2 172.6 157.4 86.6
0.4 54.5 33.5 171.2 156.5 83.5
0.8 53.0 31.2 172.6 158.1 81.1
1.6 51.6 29.0 176.7 162.2 79.3
Mean 59.1 42.1 207.6 188.2 99.3
Poamoho 1989
0.003 160.3 85.3 229.7 221.1 203.4
0.006 155.5 80.0 224.6 216.3 198.1
0.012 150.5 74.2 214.4 206.6 188.7
0.025 145.2 67.7 199.8 192.5 175.7
0.05 140.3 61.6 183.9 177.3 161.8
0.1 135.4 55.8 167.4 161.5 147.4
0.2 130.6 50.3 151.4 146.1 133.5
0.4 126.0 45.3 136.3 131.6 120.4
0.8 121.5 40.8 122.6 118.3 108.5
1.6 117.1 36.7 110.2 106.4 97.7
Men 138.2 59.8 174.0 167.8 153.5
- 223 -