1. No-till Soybean Responses to Residual Fertilizer K and Site-Specific Exchangeable K on Variable Soils

t Because meeting the potassiuln (K) requirements of no-till soybean is more dependent on soil properties near the soil surface than it is in conventional soybean production, management of both tillage systems and K fertilizer application in the preceding corn crop may also be critical for the subsequent no-till soybean crop. Both stratification and spatial variability in soil exchangeable K may constrain the achievement of satisfactory yields and consistent seed quality in no-till soybean. The objective...