Laboratory Nutrient Recommendations All recommendations are based on a 0-6″ sampling depth and methods listed on this website. Crop/Land UseNPKLawn and GardenNPKForage CropsNPKOil CropsNPKVegetable, Nut& Fruit CropsNPKTurf & LandscapeNPKRowcrops andGrain CropsNPKFiber CropsNPKTree ProductionNPK