Year: 2021 | Month: December | Volume 8 | Issue 2

Improving Quantitative and Qualitative Properties of Cotton Through the Use of Organic and Chemical Fertilizers Under Water Deficit Stress Conditions

Saeid Heydarzadeh Arash Hosseinpour Harun Gitari Sagar Maitra Amir Rahimi


Water deficit stress and poor soil fertility in arid and semi-arid regions are the most important factors limiting the growth and yield of cotton plants. A factorial experiment was conducted in a randomized complete block design in a research farm in the Ardabil (Moghan), Iran, in the 2019-2020 crop year with three replications. Experimental treatments included moisture levels at three levels (40, 60, and 80% of field capacity) and fertilizer application at four levels (vermicompost, cattle manure, chemical fertilizers (urea and triple superphosphate), and control). The results showed that the content of photosynthetic pigments decreased significantly with delay in irrigation. At the same time, the highest amounts of proline, malondialdehyde, and hydrogen peroxide were observed in irrigation conditions of 40% moisture of field capacity. Application of organic and chemical fertilizers compared to the control showed a significant effect on increasing the chlorophyll a, chlorophyll b, total chlorophyll, and carotenoids. The relative water content, nitrogen, phosphorus, potassium, and oil percentage increased by 32, 24, 23, and 26% in optimal irrigation conditions and 28, 21, 15, and 20% in moderate stress conditions and 23, 16, 14, and 19, respectively, in severe stress conditions due to vermicompost application compared to treatment without fertilizer. Due to vermicompost application in irrigation conditions, maximum grain yield (2558.33 kg ha-1), fiber yield (1117.04 kg ha-1), oil yield (651.81 kg ha-1), and oil percentage (25.48%) were obtained, with 80% of field capacity obtained. Based on the results of this study, it can be concluded that in conditions of low irrigation, the application of organic fertilizers is more effective in improving the quantitative and qualitative characteristics of cotton. It is better to increase the yield of agricultural products from vermicompost and cattle manure instead of chemical fertilizers, to be used to reduce environmental pollution and their production costs to achieve a sustainable agricultural.

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