Abstract
A field experiment was conducted on clay soil at Agriculture Research Center Station, Giza, Egypt, tomato (Solanum lycopersicum L., var. 448) plants were grown during the winter season of 2020-2021. Nanofertilizers were prepared by ball-milling and investigated by Transmission Electron Microscopy (TEM) measuring the potassium fertilizer particle sizes. Four treatments were apply as 100% of recommended dose (traditional K fertilizer-control treatment) 60, 30, 10% K NFs and two sources of KNFs as K-humate(bio-source) and K-gluconate(organo-source), and two methods of K fertilizer apply as soil and foliar. The K-compound were sprayed with 1000g/400 liter fed-1. The aim of this study improving the use of potassium fertilizers by applying nanotechnology, raising tomato yields and reducing K loss. The data appeared that tomato yield and their quality showed more response to foliar application, K-humate at rate 10% of K NFs, and showed that the KNFs foliar spray application at rate of 10% reduced losses of K through soil depths.
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