The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya
Table 8
Relationships between phosphorus fractions with maize grain yields at Nyabeda and Khwisero.
Treatment
P fraction
Nyabeda
Khwisero
Season 1
Season 2
Season 1
Season 2
TSP + Ureaa
Resin-Pi
0.74***
0.70***
0.54**
0.40*
NaHCO3-Pi
0.77***
0.50**
0.62**
0.43*
NaHCO3-Po
ns
ns
ns
ns
NaOH-Pi
ns
0.60**
0.51**
0.37*
NaOH-Po
ns
ns
ns
ns
HCl-Pi
ns
ns
ns
ns
Olsen P
0.66***
0.45*
0.54**
0.40*
TSP + Tithoniaa
Resin-Pi
0.53**
0.43*
0.48*
0.43*
NaHCO3-Pi
0.44*
0.39*
0.45*
0.44*
NaHCO3-Po
ns
ns
ns
ns
NaOH-Pi
0.40*
0.41*
0.44*
0.29
NaOH-Po
ns
ns
ns
ns
HCl-Pi
ns
ns
ns
ns
Olsen P
0.59**
0.40*
0.55**
0.50**
MPR + Ureaa
Resin-Pi
0.49*
0.53**
0.74***
0.58**
NaHCO3-Pi
ns
0.39*
0.70***
0.58**
NaHCO3-Po
ns
ns
ns
ns
NaOH-Pi
0.33*
0.51**
0.51**
0.49*
NaOH-Po
ns
ns
ns
ns
HCl-Pi
ns
ns
ns
ns
Olsen P
0.50**
ns
0.76***
0.53**
MPR+ Tithoniaa
Resin-Pi
ns
ns
0.64**
ns
NaHCO3-Pi
ns
ns
0.67**
ns
NaHCO3-Po
ns
ns
ns
ns
NaOH-Pi
0.39*
ns
0.36*
ns
NaOH-Po
ns
ns
ns
ns
HCl-Pi
ns
ns
ns
ns
Olsen P
0.40*
ns
0.68***
0.48*
P fractions for P rates of 50 and 250 kg ha−1 have been included in the analysis. *, **, and ***significance at 0.05, 0.01, and 0.001 probability levels, respectively; ns: not significant.
