This work aimed to study the effect of interaction between four N rates (100%, 75%, 50% and 25% of recommended dose) and spraying with three rates of Mg (0, 1%, and 2%) on Jerusalem artichoke plants growth, tuber chemical analysis and tuber yield under sandy soil conditions. The results indicated that application of 100% or 75% of recommended N were the best treatments for increasing plant growth, most of tuber chemical analysis parameters, and tuber yield / plant as well as per feddan. Spraying with Mg increased all studied parameters compared to control treatment. On the other hand, the best interaction treatments for increasing plant growth, tuber chemical analysis and tuber yield were application of 100% N + spraying with 1% or 2% Mg and application of 75% N+ spraying with 1% Mg approximately.
This work was carried out in the two successive seasons of 2016 and 2017 on fiveyear-old peach Florida prince cv. trees (Prunus persica L.) grown in sandy silt soil at 3×5 m apart under drip irrigation system of a private peach orchard located at Belbies district, Sharkia Governorate, Egypt. The tested trees sprayed with nano-chitosan at 10, 20, 30 and 40 ppm, nanosilicon at 200, 400 and 600 ppm and potassium silicate at 1000, 2000 and 3000 ppm as well as water (control treatment). The results showed that spraying of nano-chitosan at all rates exhibited the highest TSS/acid ratio in the fruit juice without significant differences between them in the two seasons. Untreated trees had a highest vit. C content in fruits compared to other treatments. Also, 3000 ppm potassium silicate treatment gave the highest total sugars and carbohydrate percentages. The treatment of potassium silicate at 3000 ppm gained highest leaf mineral contents of N, P, K, Fe, Zn and Mn, while, lowest leaf mineral contents of Fe, Zn and Mn were recorded with control and nanochitosan at 10 ppm.
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