Abstract
No-till management results in little or no incorporation of crop residues and fertilizer into the soil, which may increase soil moisture and nutrient uptake in summer, but may result in colder soil and reduced uptake in early spring. In some soils, subsurface phosphorus (P) and potassium (K) banding can be more effective than broadcasting by limiting reactions with soil that may reduce their availability. Also, P and K move little through the soil profile (except in sandy soils) and broadcast fertilizer with no-till causes accumulation in the top few inches of soil that may increase or decrease uptake. Therefore, a study was conducted from 1994 through 2018 to evaluate effects of P and K fertilizer rates and placement methods on grain yield of corn and soybean managed with no-till or tillage. Broadcast, planter-bands, and deep bands were evaluated until 2001 when deep banding was dropped. Previous reports showed deep-band results. This report summarizes results for broadcast and planter-band methods for the 25-yr study.
How to Cite:
Mallarino, A. P., Thompson, L. B., Rees, M. C. & Schneider, C., (2021) “Phosphorus and Potassium Fertilizer Placement Methods and Tillage Systems for Corn and Soybean During 25 Years in Southeast Iowa Soil”, Iowa State University Research and Demonstration Farms Progress Reports 10.
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