The present work was conducted in a private orchard situated at Motobus, Kafr El-Sheikh governorate, Egypt during 2014-2015 and 2015-2016 seasons. The main objective of this study is to evaluate the effect of kaolin foliar applications on disorder fruits, yield, fruit quality and storability of Balady mandarin fruits (Citrus reticulate,B) for 45 days. Trees were sprayed with kaolin at five concentrations (0, 1, 2, 3 and 4% ) for three times in summer. Fruit samples were divided into two groups and stored at 2±1 0 C and 6±1 0 C at 90-95% RH for 45 days.Results showed that, kaolin foliar applications led to increase yield (as number, weight and (kg) of fruits/tree), reduced fruit disorders and improved fruit quality, moreover, it recorded the highest peel fruit firmness, acidity level, soluble solids content (SSC %) and vitamin C content at harvest time. The highest level of kaolin spray (4%)significantly enhanced such trials compared to control and the other kaolin concentrations.In addition, kaolin foliar application at 4 % were the most effective treatment in maintaining fruit quality of Balady mandarin fruits during cold storage at the two storage temperatures (2±1 0 C or at 6±1 0 C) for the two seasons, which significantly indicated by reducing weight loss and decay as well as chilling injuries percentages. Also, kaolin treatments at (4 and 3%) recorded the highest values of peel fruit firmness, high levels of SSC, acidity and vitamin C contents compared to the other treatments till the end of storage period, with no significant changes in SSC/acid ratio. Therefore, spraying with kaolin at 4 % three times in summer months, considered as the most effective treatment in reducing pre-harvest disorder fruits, improving yield and fruit quality at harvest time and maintained good quality and extending storability of Balady mandarin fruits over the other treatments or control during cold storage at (2±1 or 6±1 0 C).

A field investigation was performed during the two successive growing seasons 2014/ 2015 and 2015/ 2016 at a private orchard, located at Brembal, Motobus district, Kafr EL-Sheikh Governorate, Egypt, on twenty years old Navel orange trees budded on Sour orange rootstock spaced at 6*6 metres apart to study the effect of irrigation scheduling at (0.0, 0.8, 1.0 and 1.2 of EP) under biostimulants foliar application on productivity, fruit quality, storability and some water relations for Navel orange trees. The main results can be summarized as follows: The highest values for WA (seasonal water applied), CU (seasonal crop water consumed) and Ecu (consumptive use efficiency) were recorded under irrigation treatment I 0 (control) combined with Azospirillum compared with Jisemar, while, the lowest values were recorded under irrigation treatment (I 1). I 1 and I 2 treatments have recorded the highest values of PIW(productivity of irrigation water) and WP(water productivity). Treatment I 2 recorded the highest values of fruit set and the lowest rates of dropped, splitting and creasing fruits compared with the other treatments specially with Azospirillum while, the lowest irrigation level treatment (I 1) showed the lowest rate of fruit set and the highest rate of fruit drop also, high irrigation levels (I 0)gave the highest rates of splitting and creasing fruits compared with the lowest rates in I 2. Results displayed a significant increasing of SSC% and SSC/acid ratio in fruits at the low irrigation level I 1 when comparing with the low values in I 0 , as it was clear with Jisemar, whereas, acidity did not show any stable trend. Moderate irrigation level I 2 recorded the high values of V.C and peel fruit firmness compared with the low values at I 0 specially with-Azospirillum. Azospirillum application gave the high levels of chlorophyll with the high irrigation levels I 0 and I 3 compared with the lowest in I 1 ,in contrast, I 1 recorded the high rates of carotene than with I 0 , but Jisemar application was the most effective in that respect.. Treatment I 2 combined with Azospirillum recorded the highest values of fruit number, yield(kg/tree) and ton/fed. during the two seasons, while I 0 and I 3 recorded the highest values for fruit weight than the others. During storage, I 2 treatment recorded the best results on reducing fruit weight loss, limiting of fruit decay and maintaining the high levels of fruit firmness till the end of storage period specially with (Azospirillum) with a high significant differences. I 2 and I 1 treatments recorded the high levels of SSC% and VC juice contents at the end of storage during the two seasons.

T HE EFFECTIVENESS of repeated applications of GA3 and streptomycin (SM) to stimulate seedless fruit development or reducing seed number per fruit of mandarin (Citrus recticulata Blanco cv Balady) were evaluated under field conditions at Motobus district, Kafr El-Sheikh governorate during 2014 and 2015 seasons. Trees were sprayed with GA3 at 25 ppm, SM at 250 ppm, SM at 500 ppm, SM at 250 ppm + GA3 at 25 ppm and SM at 500 ppm + GA3 at 25 ppm, while the control trees were sprayed with tap water. Results indicated that GA3 at 25 ppm recorded the highest fruit weight and acidity in both seasons. SM 500 + GA3 reduced seed number per fruit with about 76.66 and 77.46 % reduction in both seasons, respectively compared to the control. Meanwhile, high yield and fruit characteristics, firmness, vitamin C, brix and SSC/Acid ratio, were maintained under this treatment. The addition of GA3 to SM increased its efficacy in this respect.

Foliar sprays with synthetic biostimulants or microbial biostimulants PGPR (plant growth promoting rhizobacteria) were used. They contain amino acids, macro and micro elements, humic acid and vitamins. Also its direct effect in release stimulants, nutrients, antibiotics, biosides and sidrofores or activation of these microorganisms in plant rhizosphere in activation and improving plant growth. This study was carried out during 2013 and 2014 seasons on 10 years old Washington navel orange (Citrus sinensis Osbeck) trees budded on sour orange (Citrus aurantium L.) rootstock, grown in a private orchard located at Motobus, Kafr El Sheikh Governorate, to study the effect of synthetic stimulants (Furdose) and microbial biostimulant (Azospirillum lipoferum)on fruit set, dropping, yield and fruit quality. Furdose as a commercial synthetic biostimulant and microbial biostimulant Azospirillum lipoferum were used as foliar application alone or in combination at two stages, before flowering(first mach) or after fruit set(first may) or before flowering and after fruit set. The obtained results revealed that, fruit set and drop percentages, yield and fruit quality were u significantly affected by Furdose and Azospirillum lipoferum treatments alone or in combination in both seasons. The data cleared that, both stimulators enhanced fruit set percentage, yield and fruit quality of Washington navel orange trees. Azospirillum lipoferum alone or combined with Furdose was more effective on improving the productivity and fruit quality .The T6 (foliar spray of A. lipoferum after fruit set) , T7 ((foliar spray of A. lipoferum before flowering and after fruit set) and T10 (foliar spray of Furdose plus A. lipoferum before flowering and after fruit set) were the most effective treatments on yield and fruit quality. It increased fruit set, yield and fruit quality in terms of fruit number, fruit kg/tree, fruit firmness, soluble solids content, reducing and total sugars and vitamin C. Fruit drop was decreased without significant differences among them in both seasons. Thus spraying with Azospirillum lipoferum after fruit set T6 (foliar spray of A. lipoferum after fruit set)) gave 112.4 and 115.7 kg/tree compared with T7 (foliar spray with Azospirillum lipoferum before flowering and after fruit set) 108.7 and 121.4 kg/tree and T10 ((foliar spray the combination of them before flowering and after fruit set) 114.7 and 130.3 kg/tree during both seasons, respectively. The use of (Azospirillum lipoferum) is recommended for increasing fruit yield and quality such as firmness, SSC, V.C and total sugars which may be increase the fruit ability to handling stages and longest shelf life, and gave the highest of net return per feddan and the increase in net return over control. when used alone or with synthetic biostemulants (Furdose) compared with the use of synthetic biostemulants (Furdose) alone .