Abstract:
A general review of fertilizer response from trials studied
during the period, 1975 to 1976, is presented. Phosphorus was
found to be the major limiting nutrient for crop producticai in the
Indiber area.
effects of phosphate fertilizer on the grain yield of
raize and on soil phosphate are closely examined. Maize yield
tended to increase linearly as the rate of phosphate was increased.
It is particularly evident that grain yield steadily increased up
to the level of 120 kg/ha P2?5* Examination of soil analytical
results shewed that the Olsen method gave a better indication of
the status of available phosphate.
General fertiliser reconnendations are given based on the data
of field fertilizer experiments and soil analysis. It is further
indicated that extreme caution must be exercised in establishing
causal relations!lips between soil analytical data and crop response.
It is suggested that phosphate fertilizers be recommended for use
by farmers when available phosphate in the soil is known to be less
then 15 p.p.m.
