Effect of Zinc Source and Application Time on Zinc Uptake and Grain Yield of Flood‐Irrigated Rice

摘要: Zinc is the most common micronutrient fertilizer applied to rice (Oryza saliva L.) in USA. Preventing yield limitations from Zn defidency requires knowledge of proper application rates and times commercial fertilizers. The objective this research was evaluate nutrition grain response as affected by Zn-fertilizer source time. Four field trials were conducted several sources preplant incorporated (PPI), delayed preemergence (DPRE), postemergence (POST) before flooding at four-leaf stage. treatments included solutions sprayed 1.1 2.2 kg ha -1 dry-granular fertilizers broadcast 11.2 . Zinc-fertilizer source, averaged across times, significantly all sites with fertilization increasing yields 12 180% compared unfertilized control. Zinc-application time, sources, only one site, which had severe deficiency. PPI (6915 ) DPRE (7456 produced similar that greater than POST (5526 ). generally comparable granular Fertilization recommendations should reflect advantages performed crop emergence. Growers can confidently apply or granules soil surface without incorporation emergence, recommended (11 preferred for alkaline, Zn-deficient soils.