Effect of Irrigation Scheduling under some Biostimulants Foliar Application for Navel Orange Trees on some Water Relations, Productivity, Fruit Quality and Storability in the North Nile Delta Region

Zaghloul, Ali; Moursi, El-Sayed

doi:10.21608/asejaiqjsae.2017.4103

Effect of Irrigation Scheduling under some Biostimulants Foliar Application for Navel Orange Trees on some Water Relations, Productivity, Fruit Quality and Storability in the North Nile Delta Region

Document Type : Original Article

Authors

Ali Zaghloul ¹
El-Sayed Moursi ²

¹ Handling Research Department, Horticulture Research Institute, Agriculture Research Center, Eygpt.

² Soils, Water and Environment Research institute, ARC, Egypt .

10.21608/asejaiqjsae.2017.4103

Abstract

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 I₀(control) combined with Azospirillum compared with Jisemar, while, the lowest values were recorded under irrigation treatment (I₁). I₁ and I₂ treatments have recorded the highest values of PIW(productivity of irrigation water) and WP(water productivity).
Treatment I₂ 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 (I₁) showed the lowest rate of fruit set and the highest rate of fruit drop also, high irrigation levels (I₀)gave the highest rates of splitting and creasing fruits compared with the lowest rates in I₂. Results displayed a significant increasing of SSC% and SSC/acid ratio in fruits at the low irrigation level I₁when comparing with the low values in I₀, as it was clear with Jisemar, whereas, acidity did not show any stable trend. Moderate irrigation level I₂recorded the high values of V.C and peel fruit firmness compared with the low values at I₀ specially with-Azospirillum. Azospirillum application gave the high levels of chlorophyll with the high irrigation levels I₀and I₃compared with the lowest in I₁,in contrast, I₁ recorded the high rates of carotene than with I₀, but Jisemar application was the most effective in that respect..
Treatment I₂combined with Azospirillum recorded the highest values of fruit number, yield(kg/tree) and ton/fed. during the two seasons, while I₀ and I₃recorded the highest values for fruit weight than the others.
During storage, I₂treatment 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. I₂and I₁treatments recorded the high levels of SSC% and VC juice contents at the end of storage during the two seasons.

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