potassium guidelines for field crops in new york - Purdue Agriculture

Potassium Guidelines for Field Crops in New York. Second Release. June 12, 2003.5. CALCULATING POTASSIUM RECOMMENDATIONS FOR SPECIFIC FIELDCROPSPotassium requirements are expressed in lbs of K 2 O. The K recommendations forsod crops depend on yield potential, soil test K level and constants associated with thesoil type. Because the K supplying potential of the soil groups varies widely, the soil testK interpretation and recommendations vary for each group. Non-sod crop K requirementsdepend on soil test K level and constants associated with the soil type. Cornell Cropcodes can be found in Appendix Table A.5.1 Corn, millet, sorghum, sorghum sudan hybrid, sudangrass and sunflowersPotassium requirements for corn (COG, COS), millet (MIL) sorghum forage (SOF),sorghum grain (SOG), sorghum sudan hybrids (SSH), sudangrass (SUD) and sunflowers(SUN) are calculated using the following K requirement equations:If SoilTestK = 1.5 * A:K recommendation = 0 lbs K 2 O/acreIf SoilTestK = A but < 1.5 * A:K recommendation = 20 lbs K 2 O/acreIf SoilTestK > (Max + 20) but