Özet:

The experiment was carried out in one of the unheated greenhouses located in Al-Haidariya sub-district of Najaf governorate during the fall season 2019. The effect of spraying calcium fertilizer (Nano- and conventional) and nitrogen on the growth, yield and chemical characteristics of two varieties of cucumber, a factorial experiment was conducted using the Randomized Complete Block Design (RCBD) with two factors, the first factor is foliar fertilization. The second factor was the cultivar factor, namely, the Yekta and the cultivar Maimon cultivar. The comparison was made between the averages of treatments according to Duncan's test and under the probability level of 0.05. Each treatment was repeated three times, and the results indicated the following: The plants of the Yekta cultivar (V1) were significantly superior in all indicators of vegetative growth, yield characteristics and components studied, relative chlorophyll content in leaves (42.92 SPAD) , total nitrogen content in leaves (31.20 mg kg-1 dry weight), total phosphorous content in leaves (3.97 mg kg-1 dry weight) , total potassium content in leaves (25.73 mg kg-1 dry weight), total calcium content in leaves (3.87 mg kg-1 dry weight), total nitrogen content in fruits (19.83 mg kg-1 dry weight), total phosphorous content in fruits( 2.73 mg kg-1 dry weight), total potassium content in the fruits was (15.49 mg kg-1 dry weight), the total calcium content in the fruit is (3.11 mg kg-1 dry weight), the average length of the fruit was (16.63 cm fruit-1), the average fruit weight is (81.78 g fruit-1), The average fruit diameter is (2.76 cm Fruit-1), the average number of fruits was (41.21. Fruit plant-1 ). and the total yield is 3.76 tons a greenhouse1. The results showed that the superiority of the combination (2 g urea + 1.5 ml.l-1 nano-calcium) significantly in all indicators of vegetative growth, yield characteristics and components studied, relative content of chlorophyll in leaves (50.08 SPAD), total nitrogen content in leaves (37.33 mg kg-1 dry weight), total phosphorous content in leaves (4.74 mg kg-1 dry weight), total potassium content in leaves (29.25 mg kg-1 dry weight), total calcium content in leaves (6.84 mg kg-1 dry weight), total nitrogen content in fruits (22.21 mg kg-1 dry weight), The total phosphorous content in the fruits was (3.10 mg kg-1 dry weight), the total potassium content in the fruits is (17.57 mg kg-1 dry weight) . The interaction between (2 g urea + 1.5 ml. l-1 nano-calcium) and (Yekta (V1) plants) had a significant effect on all studied parameters, relative content of chlorophyll in leaves (51.51 SPAD), total nitrogen content in leaves (38.90 mg kg-1 dry weight), total phosphorous content in leaves (4.88 mg kg-1 dry weight), total potassium content in leaves (30.08 mg kg-1 dry weight), total calcium content in leaves (7.03 mg kg-1 dry weight), total nitrogen content in fruits (22.85 mg kg-1 dry weight), content total phosphorous in fruits (3.19 mg kg-1 dry weight), total potassium content in fruits (18.07 mg kg-1 dry weight), total calcium content in fruits (5.62 mg kg-1 dry weight).

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