Drought that is plaguing most parts of the United States is affecting the decision on crop nutrition management in a variety of ways. Purdue University agronomists say dry soil has caused symptoms of potassium deficiency in the Indiana corn and soybean crops. Dry soil reduces potassium absorption. Therefore, according to Purdun's agronomist Jim Camberato and Brad Joern, potassium deficiency is more likely to occur in dry weather than wet weather.
If the soil continues to dry, the soil sample collected this fall will provide the wrong potassium content and pH data, which will put additional pressure on the producer. The potassium content of the soil can generally reflect the level of drought. Soil pH testing may be affected by the dry season, and slow plant growth means adding more fertilizer this spring and last fall. A higher than normal salt content affects the calculation of the pH electrode function and produces a pH reading that is about 0.5-1.0 pH units lower than the actual pH. In addition, soil moisture content is insufficient for normal soil limestone reactions. Therefore, this summer soil pH measurement will be lower than the predicted value. However, limestone is still in the soil and will increase the pH of the soil once the moisture content rises.
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