Effect of the amino acid tryptophan in the growth and yield of two hybrid cucumbers under unheated greenhouse conditions.

Abstract

The experiment was conducted during the 2021 agricultural season in one of the greenhouses in the Al-Azzawiya area in Babylon province. The research aims to determine the effect of foliar spraying of four concentrations of the amino acid tryptophan (0, 50, 100, and 150 mg L^-1  water) on the growth and yield of two hybrid cucumbers, Jamila and Super Faris. The experiment was applied according to a randomized complete block design (R.C.B.D) with three replicates. The results showed the significantly excelled on of the Super Faris cultivar  on the Jamila cultivar in average plant height (223.7) cm, number of leaves (40.58) leaf , stem thickness (13.60) mm, and dry weight of Vegetative growth  (31.92) g . The results also showed significantly excelled of the Jamila cultivar on the Super Faris cultivar in average fruit length (16.75) cm, fruit weight (113.50) g , number of fruits (12.00) per plant and yield per plant (1.367) kg. All foliar spray treatments also showed significantly excelled in the rate of Vegetative growth traits, fruit traits, and yield compared to the control   treatment. The results of the interaction showed the significantly excelled of the Super Faris cultivar at the concentration of 100 mg L^-1 in the average plant length (236.0 cm), the number of leaves (47.67) leaf , the thickness of the stem (15.26 mm), and the dry weight of Vegetative growth  (40.00) g, while the Jamila cultivar was excelled on The concentration of 150 mg L^-1 significantly affected the average length of the fruit (19.00) cm, the weight of the fruit (120.00) g , the number of fruits (14.00) per plant, and the yield of one plant (1.676) kg.