Abstract
In the planting system, very narrow row spacing with spacing of rows between 20 and 40 cm is considered. This planting method increases production. Experiments to study and compare the population thrips on 3 cluster variety and one check cultivar, using the method of narrow planting distance of 20 × 20 and 20 × 80 cm in the form of factorial design in the form of a randomized complete block design with 3 replications in Hashemabad cotton research station in Gorgan during the two years 2018-2019 was evaluated. Statistics of different stages of the thrips pest it was recorded weekly in the tested treatments and recorded in special tables. Based on studies the results of combined analysis of variance show that the yield in the cultivars tested in Sajedi® cultivar with a distance of 80 cm with an average yield of 1696 gr in the plot and Golestan® cultivar 80 cm with 1622.9 gr in the plot with the highest yield and T2® cultivar with a distance of 20 cm, 847.2 gr in plot had the lowest yield. Infestation rate of cluster cultivars tested in very narrow cultivation thrips population density in Golestan® cultivars with a distance of 80 cm and Sajedi® with a distance of 20 cm, 1.723 thrips per leaf with the most infestation and Golestan® cultivar with a distance of 20 cm, 1.388 thrips least infestation was measured in leaves. Therefore Golestan® cultivar with an average yield and thrips population infestation, the lowest cotton cultivation in agriculture ultra-narrow row 20 centimeters had in the cotton fields.
Highlights
Compared to the more spaced row spacing system, there will be evident changes in the number of bolls per plant and the state of the canopy
Golestan® cultivar with an average yield important sucking pests such as thrips population infestation, the lowest cotton cultivation in agriculture ultranarrow row 80 and 25 centimeters had in the cotton fields (Mojeni, 2019) [10]
Based on studies conducted during two years of experimentation and statistical analysis, data conversion and combined analysis of variance shows: In terms of average yield, the amount of yield obtained in the cluster cultivars tested in very narrow agriculture by performing combined analysis of variance in Sajedi® cultivar with a cultivation distance of 80 cm with 1696 gr and Golestan® 80 cm with 1622.9gr in plot has the highest yield in plot in group a and cultivars Golestan® and T2® with a distance of 20 cm with 867.4 and 847.2 gr /in plot in group c with the lowest yield at the level of 5% showed a significant difference (Tables 1 and 2)
Summary
Compared to the more spaced row spacing system, there will be evident changes in the number of bolls per plant and the state of the canopy. The row spacing is very narrow, where the planting row spacing is considered to be between 20 and 40 cm The advantages of this planting method include increasing early maturity as well as crop yield under drier climatic conditions (Philip, 2000 and 2001) [12, 13]. Golestan® cultivar with an average yield important sucking pests such as thrips population infestation, the lowest cotton cultivation in agriculture ultranarrow row 80 and 25 centimeters had in the cotton fields (Mojeni, 2019) [10]. They had the least infestation in the leaves (Mojeni, 2021) [11]
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