Soybean growth and yield response to residual fertilizer phosphorus bands
1997
Bly, A. | Woodard, H.J.
Residual effects on soybeans (Glycine max L.) from phosphorous (P) fertilizer bands applied 5 cm to the side and 5 cm below the seeds of a preceding corn (Zea mays L.) crop on a Brandt silt loam soil (fine-silty, mixed Udic Haploboroll) were studied after an intervening no-till fallow period. The P rates applied were 0, 12, 24, and 49 kg P ha-1. Soybean rows were planted as close as possible to the preceding corn rows. Soybean tissue was sampled at the early bloom stage in each row of the paired-row design. Twenty soil column (2.5x3 cm) samples were collected from the 0-15 cm depth along a 50-cm-long trench that bisected a soybean row. The distance of the previous P band (column with the highest extractable Bray-I P level) from the soybean row became a variable in this experiment with category range distances of <6 cm, 6-9 cm, and >9 cm from band to row. Residual P from all application rates increased shoot dry matter weight, shoot P uptake, and to a lesser extent grain yield in comparison to the unfertilized soybeans. Distance of the P band from the row was more important than the P concentration in the band. Shoot P uptake and grain yield were significantly larger for fertilized compared to unfertilized soybeans when the band distance was less than 9 cm from the row. Residual P band distance of greater than 9 cm from the row had little effect on soybean growth and yield.
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