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ADDITIONAL INDEX WORDS. fertilizer management, plant nutrient uptake, nutrient use efficiency, root development, soil nutrient availability SUMMARY. Right fertilizer placement is one of the 4Rs of an effective nutrient stewardship system and should be combined with considerations for the right fertilizersource,rate,andtiming.Fertilizer placementdecisions dependonmobility of applied nutrients in the soil and the depth and distribution of the crop’s root system. Various methods are used to apply fertilizers to horticultural crops, including broadcasting, banding, fertigation, foliar application, and microinjection. Generally, the most appropriate method for any crop increases productivity and profitability and improves fertilizer use efficiency but varies depending on the nutrient element, fertilizer source, soil characteristics, cultural practices, stage of crop development, weather conditions, and farming enterprise constraints. Comparisons among application methods are available for many crops and provide useful information for improving fertilizer placement practices, but many practical questions such as how fertilizer source and availability are affected by irrigation interactions or whether there are ways to manage crop roots for more effective nutrient uptake still remain.

Application of the “4R” Nutrient Stewardship Concept to Horticultural Crops: Getting Nutrients in the “Right” Place