The experiments were executed on the autumn and the winter of (2016 /2017, 2017/2018) seasons at Qalyub area, EL-Qalyubia governorate, Egypt. The main objective for this study to find out the efficacy of several biological and the chemical controls on growth and productivity of lettuce crop and management on white rot disease caused on Sclerotinia sclerotiorum. Thus, four treatments were applied as follow 1- the control (water application),2- Trichoderma asperellum, 3-Salicylic acid and 4- Calcium Chloride, which were evaluated and compared for the three fungicide as follow : 1- Iprodione , 2- Tebuconazole with Fluopyram and 3-Tebuconazole at the doses (85 & 100 ; 200 &100 and 50 &100 g or ml / 100L-1 respect.) . Which they tested for their ability for increasing the lettuce crop productivity and suppress mycelial growth of S. sclerotiorum pathogen by treatments were sprayed on two times on plants at (15-19 BBCH) stages by using backpack sprayer by 250 L./Fed.). Results indicated that, Iprodione applications significantly gave the highest indications of total and the Marketable yield in compared with the other experimental treatments for both seasons. Moreover, the two times of sprayes by Iprodione and Salicylic acid treatments had significantly lowered the disease incidence and disease severity and increasing the control efficiency in the both seasons. Whereas, the other treatments, Tebuconazole with Fluopyram or Tebuconazole and Trichoderma asperellum had a moderate effecacy on the lettuce crop productivety or the disease severity and incidence of Sclerotinia sclerotiorum in compared to the control treatment. In the contrast, application by Calcium Chloride had a low effect on the average yield or final yield as a mass and marketable plant in the both seasons and had insignificant effect on the disease severity or incidence of S. sclerotiorum despite low to medium recovery following applications. Finally, the control treatment was the lowest.

This study was carried out during the two successive seasons (2017 and 2018) on the first and second ratoon of healthy uniform banana cv. Williams (Musa spp.) Plants grown in sandy soil under drip irrigation system in a private orchard located at El-Tahadi region, Cairo Alexandria desert road, Behaira governorate, Egypt. The investigation aimed to study the effect of different slow release potassium fertilizer (SRKF) (50% K2O) rates (100%, 75% and 50%) were added as soil drench during mid March, mid June and mid September while, potassium sulphate dose used in control treatment was added at monthly intervals as soil application from mid March until mid October on vegetative growth, productivity, total yield income and net return/feddan of banana plants. The obtained results showed that, all treatments had a significant effect on enhancing the vegetative growth parameters, i.e. number of green leaves /plant, plant total assimilation area (m2/plant), leaf total chlorophyll content (CCI) and leaf macro element content (N, P and K) as (%) as well as leaf micro element content (Fe, Zn and Mn) as (ppm). Also, improving yield (ton/feddan), bunch weight (kg), number of hands/bunch, hand weight (kg), number of fingers/hand, finger weight (g), finger length (cm), finger circumference (cm), finger pulp weight (g), finger pulp/peel (ratio), TSS (%), TSS/TA (ratio), total sugars (%). In addition, the total yield income (1000 LE) and net return/feddan (1000 LE) in both seasons. Moreover, all treatments had no significant effect on plant pseudostem height (cm), pseudostem circumferences (cm) and leaf area (m2) of plant in both seasons and bunch length (cm) in the first season only. Treatment of: slow release potassium at 100% gave the highest values of physical and chemical properties of banana plants cv. Williams in both seasons compared to, control treatment (100% potassium sulphate) and slow release potassium at 50% gave the lowest values.