To evaluate the effectiveness of P & K in fibrophos when applied to Spring Barley. A replicated trial was carried out on Spring Barley grown at Kirton in Suffolk on soil with a pH of 7.5, P index 1 (low) and K index 0 (very low). fibrophos was compared with TSP and MOP.
Results
Yield: There was an upward trend in yield with increasing rate of fibrophos for both Phosphate and Potash. The difference in yield from the untreated control and positive rates of fibrophos were significant. Less response was seen with MOP.
Highest yields were obtained with the fibrophos application.
Bushel weight: There was a significant increase in grain bushel weight with fibrophos. There was no significant increase in grain bushel weight from TSP and MOP.
Grain analysis: fibrophos increased the uptake of Potash and Sulphur in the grain compared with TSP and MOP. N:S ratios measured in the fibrophos treatments gave good ratios which indicated deficiencies were unlikely.