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In Conservation Agriculture(CA), three basic principles, i.e. no tillage, crop rotation and keeping residues on the soil surface, are followed. The advantages and disadvantages effects of the CA components require local investigations. Because the amount of irrigation water, control of weeds and pests in different regions of the world requires different management. One of the problems of not tilling the soil and preserving residues is irrigation management, especially in the surface irrigation. In these conditions, the low flow is not able to cover the length of the field and the non-uniformity of the growth of the plants will be quite evident. However, the role of irrigation with low water should be clarified in the management of uncultivated fields. Considering the importance of uniformity of water distribution and the importance of developing new irrigation methods, a three-year project at the Hashemabad cotton research station in Gorgan in the form of a strip plot with irrigation water amount treatments of zero, 40, 70, 100, 120, 140 percent Evaporation was done from class A evaporation pan. In this article, the result of 1401 is stated. Irrigation was done after the beginning of flowering. The distance between the plants was 20 x 75 cm (due to the ease of using agricultural machinery in the stage), the distance of the treatments from each other was considered to be three planting reefs. In each plot, three plants were randomly selected and marked. The necessary agronomic measurements were in the stage until harvesting was done on these plants. Different amounts of water have been effective on the duration of planting until the beginning of different phenology stages. Considering the importance of water, W100 treatment can be introduced as a suitable treatment for irrigation of cotton fields under conservation agriculture
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