Micronutrient Availability as Affected by the Long-Term Application of Phosphorus Fertilizer and Organic Amendments
- Jaben R. Richardsa,
- Hailin Zhanga,
- Jackie L. Schroder *a,
- Jeffrey A. Hatteya,
- William R. Rauna and
- Mark E. Paytonb
Micronutrient availability is important to crop production and can be affected by long-term application of P and organic amendments. This study was conducted to determine the effects of the long-term application of different sources and rates of P application on extractable [DTPA-sorbitol (diethylenetriamine-pentaacetic acid and sorbitol] micronutrients. Soil extractable and total micronutrients (B, Cu, Fe, Mn, Mo, and Zn), pH, and organic matter content were determined from sites across Oklahoma that had received long-term applications of beef manure, swine effluent, biosolids, or commercial fertilizer. Three continuous inorganic P experiments that had been conducted for 36 to 39 yr and three organic P experiments that had been conducted for 11 to 12 yr were evaluated. The long-term application of inorganic P had little effect on micronutrient availability. However, long-term application of biosolids significantly (p < 0.05) increased extractable Cu, Fe, Mo, and Zn in soil, while long-term application of beef manure significantly increased all the micronutrients evaluated. Similarly, the long-term application of swine effluent significantly increased extractable B, Cu, Mo, and Zn in soil. The addition of micronutrients from organic amendments increased micronutrient availability, while long-term inorganic P application had little effect. The result of our study indicates organic amendments make an ideal fertilizer source for areas with micronutrient deficiencies.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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