Abstract
No-till management results in little 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 spring. Subsurface phosphorus (P) and potassium (K) banding has proven to be better than broadcasting in some soils by limiting reactions that may reduce the availability. Also, P and K move little through the soil profile (except in sandy soils) and in no-till, broadcast fertilizer 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., Beckman, J. & Maxwell, D., (2021) “Phosphorus and Potassium Fertilizers Placement Methods and Tillage Systems for Corn and Soybean During 25 Years in Southwest Iowa Soil”, Iowa State University Research and Demonstration Farms Progress Reports 2020(1).
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