الفهرس 
Evaluation of organic acids application on macro- and micronutrients availability in some soils of Egypt and South Africa
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Abstract
A field experiments was carriedout on a clay soil at Elgiza Agricultural research station, Giza, Egypt, cultivated with tomato plants (solanum lycopersicum, L. var. 448) during the growing winter season of 2015 and spring 2016. The target of study to evaluate the potential benefit of applied different forms of potassium as bio-K (fulvate and humate) and organo-K (citrate and, gluconate,) on tomato yield and some fruit quality. The applied treatments of the studied potassium were foliar and soil applications, with special reference to the control treatment (an initial nutritional status). The potassium compounds were sprayed with 1 kg/400 liter fed-1 applied at four different periods, after 15, 30, 45 and 60 days from planting. The data obtained revealed that tomato yields and their quality showed a superior effect for foliar spray compared to soil application. Potassium humate and citrate exhibited the highest increases in both macro- micro nutrients content in tomato fruits and vegetative parts with more availability in the studied soil. from aforementioned results, it can be concluded that the application of potassium either in bio or organo forms specially potassium humate under both foliar spray and soil application, resulted in increasing, tomato crop yields and quality as well as improving the nutritional status of both plants and fruits with relatively higher ability for increasing macro- micronutrients availability in soil under soil application than foliar one