Effect of adding the chemical fertilizer npk and humic acid on the growth and mineral percentage for seedlings of three grape cultivars (vitis vinifera l. )‎

الملخص EN

This experiment was conducted in the nursery of the Department of Horticulture and landscape gardening, College of Agriculture and Forestry, University of Mosul, Iraq during the agriculture season (2019) to study the effect of chemical fertilization for compound fertilizers (NPK) (20: 20: 20), with three concentrations which are (0, 125, 250 mg NPK.

L-1) and organic fertilization with humic acid (HA) in three concentrations (0, 10, 20 mg.

L-1) on three cultivars of grapes: Rashmio, Taif, and Halawani, and studying all the interactions between the studied factors.

The results can be summarized as follows: The chemical fertilization with compound fertilizers (NPK) especially at a concentration of (250 mg NPK.

L-1) achieved a significant increase in the percentage of nitrogen, phosphorous, and potassium in the petioles of the leaves, the concentration of chlorophyll and the percentage of protein in the leaves.

Organic fertilization with humic acid, especially at a concentration of (20 mg.

L-1) led to a significant increase in the percentage of nitrogen, phosphorus, and potassium in the Petioles leaves of grape seedlings, the concentration of chlorophyll, and the percentage of protein in the leaves.

The studied traits varied according to the cultivated cultivars, where the Halawani cultivar significantly excelled on the two cultivars (Rishmio and Taifi) in the percentage of nitrogen, phosphorus, and potassium in the petioles of the leaves and the percentage of protein, while the two cultivars were significantly excelled on to the Halawani cultivar in the concentration of chlorophyll in leaves.

The interaction treatments between NPK levels, concentrations of humic acid, and the three cultivars of grape had a significant effect on the percentage of nitrogen, phosphorus, and potassium in the Petioles leaves, especially at the treatment (250 mg NPK.

L-1 + 20 mg HA.

L-1 for the Halawani cultivar) and the percentage of protein in the leaves.