EFFECTS OF HUMIC ACID AND BREAD YEAST ON GROWTH  AND YIELD OF LETTUCE (LACTUCA SATIVA L.)  UNDER PROTECTED CONDITIONS

IBRAHIM RAJAB  IBRAHIM

doi:10.26682/ajuod.2020.23.2.17

IBRAHIM RAJAB IBRAHIM Dept. Protected cultivation, technical institute of zakho, Duhok polytechnic university

DOI: https://doi.org/10.26682/ajuod.2020.23.2.17

Keywords: HUMIC ACID, BREAD YEAST, YIELD OF LETTUCE

Abstract

A research study was conducted in a plastic house (500m2
) at the vegetable research field of the
protected cultivated department at Zakho Technical Institute, Dohuk Polytechnic University, Kurdistan
Region-Iraq. The period of study was at Autumn season of 2018 to investigate the effect of foliar
application of humic acid in three levels (0, 2 and 4) ml/L and bread yeast with three levels (0, 2.5 and 5)
g/L on the growth and yield of lettuce (Cv. Romaine). The results showed that treatment with foliar
spraying of humic acid and yeast had significant effects on growth and yield of letteus , The level (4) ml/L
, also the foliar spraying of yeast at the level (5) g/L had the highest results in the growth of vegetative
characters ( No. of leaves. plant-1
76.41leaves and chlorophyll content% 45.04%), leaf mineral content
(Nitrogen, Potassium and Phosphorus) and head weight (gm) of lettuce when encountered with control
and other treatments.

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