Response of corn to zinc source and rate of zinc band applied with either orthophosphate or polyphosphate
1980
REHM, G. W. | Wiese, R. A. | HERGERT, G. W.
Comparisons of the effectiveness of the various zinc sources have, in past research, produced conflicting results. Therefore, this study was conducted to evaluate the effect of zinc source, zinc rate, and phosphorus carrier on corn production in the western corn belt of the United States. Three sites were selected representing a wide range of soil pH and other soil properties.The zinc sources were mixed with a suspension fertilizer (8–8.8–4.8) to supply four rates of zinc. The fertilizer was placed below and to the side of the seed at planting. Whole plant samples collected at two stages of growth and ear leaf samples collected at silking were used to evaluate the influence of zinc source, zinc rate, and phosphorus carrier on zinc uptake by corn.Zinc uptake by plants sampled three weeks after emergence was influenced by zinc source, zinc rate, and phosphorus carrier. Differences among sources were related to soil properties. Phosphorus carrier had no effect on zinc uptake at a later growth stage. Differences in zinc uptake brought about by the different zinc sources and phosphorus carriers were not reflected in yield. Application of zinc increased yield at one of the three sites, 1.7 kilograms of zinc per hectare being adequate for maximum yield. Neither zinc source nor carrier had any effect on yield throughout the study. The data showed no advantage of the chelated forms of zinc over inorganic forms when they were applied in a suspension fertilizer to the side of and below the seed at planting.
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