Proceedings
Authors
| Filter results4 paper(s) found. |
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1. Efficacy of Variable-Rate Application Technology for Phosphorus, Potassium, and Lime ManagementVariable-rate (VR) application technology may improve P and K fertilizer and lime use efficiency, increase crop yield and the profitability of crop production, and reduce within-field soil-test variability. On-farm research assessed the potential of VR P or K fertilization and liming for corn and soybean in Iowa. Replicated strip-trials evaluated one to three cycles of the two-year rotation. Treatments for areas 10-30 acres in size were a non-fertilized or unlimed control, VR based on dense grid-point... A.P. Mallarino |
2. Role of Postemergence Sidedressed Fluid Potassium Fertilizer to Complement Preplant Fertilization in Corn-Soybean RotationsRole of Postemergence Sidedressed Fluid Potassium Fertilizer to Complement Preplant Fertilization in Corn-Soybean Rotations Antonio P. Mallarino and Louis B. Thompson-Ansorena Iowa State University ABSTRACT Farmers and crop consultants of non-irrigated areas of the north-central region have been asking questions about possible use of post-emergence fluid potassium (K) fertilization to complement preplant fertilization. Sidedressing N for corn is common,... A.P. Mallarino, L.B. Thompson-ansorena |
3. Pelleted Lime Application Strategies for Iowa Corn and Soybean ProductionResearch has shown inconsistent results about the efficiency of pelleted lime at increasing soil pH or crop yield compared with aglime. Our previous Iowa research (2015-2016) showed that pelleted lime manufactured with limestone from northern Iowa quarries attained maximum soil pH with the same rate and at the same time than finely ground calcium carbonate, but more time was needed for aglime. However, there were no yield differences between the sources for corn-soybean rotations when one-time... A.P. Mallarino, M.U. Haq |
4. Iowa Phosphorus and Potassium Soil-test Interpretations Were Updated in 2023: Changes and ReasonsNew field research is conducted as issues or questions arise to assure that nutrient management guidelines are kept current. The Iowa State University phosphorus(P) and potassium (K) soil-test interpretations for crops were updated in 2023 because the previous update had been in 2013 using data until 2012 and research since then indicated a need for some changes. Field-response trials with corn and soybean from 2013 until 2020 involved 799 site-years for P and 724 site-years for K, encompassed... A.P. Mallarino |