Effect of Drought Stress and Consumption of Organic Fertilizers on Yield and Yield Components of Potato (Case Study of Isfahan Province)
2021
Yahyaabadi, Mojtaba | dehghani, mohsen
In order to investigate the effect of different organic fertilizers on yield and some physiological characteristics of potato under drought stress conditions, an experiment was conducted in the form of split plots, based on randomized complete block design with three replications in 2018 at Baraan region in Isfahan. The applied treatments include drought stress based on the fraction of Allowable Water (AW) or Management allowed Deplition (MAD= 45% as a control, 55%, 65% and 75% in main plots) and organic fertilizers including vermicompost (7 ton ha-1), municipal waste compost (15 ton ha-1), cow manure (50 ton ha-1) and control (without fertilizer application) were in the sub-plots. Results showed that the drought stress reduced yield and its components and reduced leaf chlorophyll content (p≤0.01). Comparison of means showed that potato yield in vermicompost treatment without drought stress reached 33 tons per hectare. Intraction of vermicompost and irrigation after 65% depletion of AW (reduction of 20% in water consumption), led to the production of 23 tons per hectar potato. Under these stress conditions, compost treatment also resulted in potato production of 21 tons per hectar. The interaction of vermicompost and irrigation after 75% depletion of AW (30% reduction of water consumption), Leaf chlorophyll reached 12 mg/g, the same as situation at no application of vermicompost and drought stress. Also, the highest amount of proline was measured in the interaction of MAD=65% and compost and vermicompost treatments with 21.2 and 24 mg/g, respectively. In general, the application of organic fertilizers could help to reduce the negative effects of drought stress.
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