Effect of quantities of seeds on dry matter production of parts of the plant and on yield and its components of varieties of barley hordeum vulgare l

الملخص EN

A field experiment was carried out at the Second Agricultural Research and Experiments Station of the College of Agriculture / University of Al-Muthanna in Al Bandar region, in the winter season (2020-2021), to study the effect of seed quantities on the production of dry matter of varieties of barley, and the experiment was applied according to the arrangement of the plates.

The split was according to a randomized complete block design(RCBD) with three replications.

The experiment included the main factor of five seed quantities (20, 40, 60, 80, 100 and 120 kg ha-1), and the secondary factor included two of varieties barley (Aksad, Ibaa265).

The results showed that the quantities of seeds were significantly superior in all yield characteristics and the dry matter of the plant parts in the barley crop, where the quantity of seeds 80 kg ha-1 was superior to the dry weight of stems, the dry weight of leaves in the stage of full maturity and the number of grains in the spike, which reached Their averages were (21.12 g, 15.30 g, and 50.1 grain spike-1) respectively, and the 60 kg ha-1seed quantity outperformed in the dry weight of the fully ripened ears, the dry plant weight and the weight of 1000 grains, as their averages were (41.41 g and 77.08 g and 26.28 g) respectively, and the quantities of seed 120 kg ha-1outperformed in the number of spikes and grain yield, as they reached 371.11 spike m-2and 6.47 tons ha-1).

The lowest seed level of 40 kg ha-1gave the lowest averages for most of the studied traits, as it gave the lowest average dry weight of stems, leaves and ears, and the dry weight of the plant in the fully mature stage, and the weight of 1000 grains, where their averages were (15.53 g, 12.20 g, 24.21 g, 51.94 g and 24.

1 gm) sequentially.

As for the cultivars, there were no significant effects, but the cultivar ibaa 265 was superior in most of the studied traits compared with the cultivar Aksad.

With regard to the interaction between the quantities of seeds and varieties, there were no significant effects between them.