| Autor: |
Roberts, T. L., Drescher, G. L., Kelley, J., Hoegenauer, K. A., Ortel, C. C., Smartt, A. D. |
| Předmět: |
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| Zdroj: |
B.R. Wells Rice Research Studies - Arkansas Agricultural Experiment Station, University of Arkansas System; Jul2023, Issue 694, p48-51, 4p |
| Abstrakt: |
Corn (Zea mays L.) grain yield is tightly linked to potassium (K) fertilization practices, but so is producer profitability. Work sponsored by the Arkansas Corn and Grain Sorghum Board has been ongoing to verify the current K fertilization rates based on soil test K concentrations and develop leaf tissue correlation and concentration data to diagnose in season K deficiencies. Potassium response trials were established at four research stations across Arkansas in 2022 and included the Milo J. Shult Agricultural Research and Extension Center (SAREC), the Lon Mann Cotton Research Station (LMCRS), the Pine Tree Research Station (PTRS), and the Rohwer Research Station (RRS). Six K fertilizer rates ranging from 0-200 lb K2O/ac were applied preplant and incorporated prior to corn establishment. At the VT growth stage earleaf (leaf immediately subtending the ear) samples were collected, dried, ground and analyzed to determine tissue-K concentration. At maturity corn grain yield was determined using a small plot combine. Preplant soil samples suggested that the PTRS location should be highly responsive to K fertilizer applications, that LMCRS would have little to no response to K fertilization and that SAREC and RRS should not respond to K fertilization. Yield results indicated a significant yield increase from K fertilization at the LMCRS and the PTRS with yield increases of 14 and 83 bu./ac, respectively. Corn earleaf tissue-K concentrations ranged from 0.79% to 2.67 % K and were not statistically different than one another at the SAREC or RRS locations but were influenced by K fertilizer rate at LMCRS and PTRS. The results of this trial suggest that corn response to K fertilization in Arkansas can be significant and that earleaf tissue-K concentrations can be a good indicator of K nutritional status. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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