The conventional sprayers, such as the gun sprayers were applied for the apple trees under Egyptian conditions. In organic apple production the growers tends to apply the compost tea as provide fertilizer and pesticides control. The objectives of this current research were to spray the compost tea by using the gun sprayer, air assisted backpack sprayer Suzuki (2.13 kW) and Tiazh. Qinili Machinery Knapsack. Also, investigated to use the yeast with the compost tea to improve and increase nutrient availability. The different techniques sprayers an air assisted backpack sprayer Suzuki (2.13 kW) and Tiazh. Qinili Machinery Knapsack sprayer (0.7 kW) achieving thorough coverage was compared to a conventional hydraulic sprayer (gun sprayer) to apply the bio fertilizer compost tea. Two different composts tea, the aerated compost tea (ACT1) and nun-aerated compost tea (ACT2), were applied under laboratory conditions. The 10 gm of yeast/10 liter was added for both compost teas (ACT) as the marker of the microorganism in the compost tea. Microscope with digital camera and software Image J V1.52 program was used to count the yeasts cells before and after spray treatment conditions. The conventional hydraulic sprayer (gun sprayer) gave a good result to apply the compost tea with low values of number of microorganisms (yeast cells). The low values of yeasts after treated main that there are a highest damage or crushed of yeast cells and the nutrition will be increasing. The viability numbers of yeast cells for conventional gun sprayer in ACT1 compost tea were 0.76 x 106 / ml and 0.52 x 106 / ml at operating pressure 390 kPa and 480 kPa respectively. As well as, the viability numbers of yeast cells for conventional gun sprayer in ACT2 compost tea were 0.84 x 106 / ml and 0.76 x 106 / ml at operating pressure 390 kPa and 480 kPa respectively.
The values of number of yeast cells for ACT1 were 0.52 x 106 /ml, 2.60 x 106 / ml and 1.22 x 106 / ml for conventional sprayer, motorized an air assisted backpack sprayer Suzuki with 2.13 kW power and Tiazh Qinili Machinery Knapsack sprayer with 0.7 kW power respectively. The viability numbers of yeast cells for ACT2 were 0.63 x 106/ ml, 1.06 x 106 / ml and 0.82 x 106 / ml for conventional sprayer, motorized an air assisted backpack Suzuki sprayer and Tiazh Qinili Machinery Knapsack sprayer respectively.The viability numbers of yeast cells for the air assisted backpack Suzuki sprayer were 2.3 x 106 / ml and 4.6 x 106 / ml for ACT1 and ACT2 compost tea at half open throttle air position respectively.The conventional gun sprayer produced highly values of damage percentage compared to the T.Qinili sprayer and Suzuki sprayer. The percentage of damage yeasts cell in ACT1 were 97.25% and 96.08 % at operating pressure 480 kPa and 390 kPa respectively.