Effect of Fertilization on Yields and Nutrient Content of Barley1
- C. W. Carlson and
- D. L. Grunes2,3
The fertility status of the A1p, AC, and C1 horizons, and of mixtures of horizons A1p and C1, of a Gardena loam was evaluated in a controlled light-temperature plant-growth chamber. Barley growth was greatest on the A1p horizon at all fertilizer levels. Applications of nitrogen fertilizer increased yields on all horizons, but phosphorus additions did not. When both N and P were added, yields were greater on all horizons than when either was added alone. Fertilization with minor elements increased yields on the AC horizon while potassium sulfate increased yields on the C1 horizon. In mixtures of horizons A1p and C1, and at all N and P rates, yields increased as the percentage A1p increased. Total nitrogen in plant tops grown on horizons AC and C1 was similar, but less than that in plant tops grown on the A1p horizon.
Total phosphorus absorbed was less for plants grown on the C1 horizon than for plants grown on the A1p horizon. In the presence of added nitrogen, amounts of total phosphorus absorbed from the AC horizon were similar to amounts absorbed from the C1 horizon at the lower P rates, and from the A1p horizon at the high P rate.
Yield increases observed on the nitrogen treatments, with increasing percentage of the A1p horizon in the mixtures, were due in large part to the greater phosphorus availability of the A1p horizon. There was a tendency for the addition of C1 soil to decrease the availability of fertilizer phosphorus to plants.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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