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Perennial Ryegrass Growth, Development and Seed Yield Influenced by Phosphorus Source Rate

Start Date: 2014
Principal Investigator: Nancy Ehlke
Organization: University of Minnesota, Department of Soil, Water, and Climate
Status: Complete

Background Info

Perennial ryegrass is a relatively new grass seed crop in northwestern Minnesota, with projected harvested acres of more than 30,000 acres in 2014. Perennial ryegrass is raised on more acres than all the other grass seed crops combined. The primary objective of this research is to validate the current phosphorus recommendations for perennial ryegrass grown in the high-pH soils of northwestern Minnesota. The research also compares dry versus liquid sources of phosphorus fertilizer, and investigates the use of a double rate (60 pounds per hundredweight) of P. According to typical agronomic practices, the rye was seeded under standing spring wheat.


Validate the current phosphorus fertilizer recommendations in perennial ryegrass seed production with a phosphorus rate and timing small plot trial conducted in the high pH soils of northwestern MN

Conduct small plot replicated research trials in perennial ryegrass seed production to evaluate phosphorus source, dry and liquid, in high pH soils

Design and implement large on-farm research trial to evaluate standard (dry) phosphorus broadcast compared to a 2X rate of phosphorus broadcast on the soil. Perennial ryegrass yields will be quantified by grain cart weights and combine yield maps

Key Findings

The perennial ryegrass seed will be harvested in August 2015, and it will be evaluated by grain cart weight, as well as by aerial yield maps. Data to be collected in 2015 include perennial ryegrass emergence and vigor ratings, crop color ratings, chlorophyll meter ratings and other important characteristics.

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