Analysis of WICST Cropping System-5 Alfalfa K Fertilization Trial

After approximately 15 years, several plots in the organic dairy rotation (CS5; corn-oats/alfalfa-alfalfa) of WICST have soil test K (STK) levels that have decreased to the optimum level or below so alfalfa yield may be limited. This is despite manure applications in 2 out of 3 years of this rotation. Potassium sulfate (K2SO4) is an […] More »

WICST Soil Test P and K at Surface- Lakeland Site (1992-2002)

Yearly soil test P and K (ppm) from Lakeland site at 6″ depth.  Data is by phase and is averaged across 4 reps per year. More »

Evaluation of Potassium Fertilization for Improved Forage: Yield and Quality

Forage yield in the intensive, rotationally grazed (IGR) system used on the Krusenbaum Farm has been lower than expected, even several years after the transition from a conventional dairy system. Periodic soil sampling has indicated the farm has low levels of soil test potassium (STK) under the University of Wisconsin soil analysis/fertility recommendation system. Available […] More »

Monitoring soil test P and K in the WICST trial

ABSTRACT Farmers are concerned about the effects of low-input cropping systems on soil fertility, even on the historically rich and heavily manured and fertilized prairie soils of Wisconsin. Soil test phosphorus (STP) and potassium (STK) changes in the top 6in. of the soil profile are being monitored in the WICST trial since 1990. The initial […] More »

Monitoring soil test phosphorus and potassium changes in the WICST trial

ABSTRACT Farmers are concerned about the effects of low-input cropping systems on soil fertility, even on the historically rich and heavily manured and fertilized prairie soils of Wisconsin. Soil test phosphorus (STP) and potassium (STK) changes in the top 6in. of the soil profile are being monitored in the WICST trial since 1990. The initial […] More »