EFFECT OF PLANTING DATES AND NITROGEN SOURCES ON DRY WEIGHT, YIELD AND NITROGEN USE EFFICIENCY OF GARLIC PLANTS GROWN UNDER SOUTH SINAI GOVERNORATE CONDITIONS

Abstract

A field experiment was carried out during the two successive winter seasons of2014/2015 and 2015/2016 at a private farm in El-Tour region, South Sinai Governorate, Egypt, tostudy the effect of planting dates, nitrogen sources and their interactions on dry weight, yield and itscomponents and nitrogen use efficiency (NUE) of garlic (Balady cultivar) grown in sandy soil conditionsusing drip irrigation system. The obtained results could be summarized as follows: The interactionbetween planting dates on 15th Oct. or 1st Nov. and fertilizing plants with 100% of the recommendedrate (RR) of N as poultry manure (PM) or and 50% RR of N as ammonium sulphate (AS)+50% RR ofN as PM gave the highest values of each of dry weight of bulbs, leaves, and total dry weight/plant at135 days after planting (DAP), N and P uptake by bulbs and leaves and total uptake of them by plant,yield of grades 1,2, exportable, marketable, total yield, average bulb weight and the highest values ofnitrogen use efficiency (NUE). Whereas, the interaction between planting on 15th Oct. and fertilizingplants with 50% RR of N as AS + 50% RR of N as PM gave the highest values of K uptake by bulbsand leaves as well as K total uptake by plant.