Endris, S and Fetene, M and Amede, T (2021) CO2 exchange, dry matter accumulation and growth response of sorghum (Sorghum bicolor L. Moench) to terminal drought as affected by potassium and blended-NPSBZn fertilization. Journal of Agronomy and Crop Science (TSI), 207 (3). pp. 450-464. ISSN 0931-2250
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Abstract
Sorghum production is constrained by terminal drought stress in semi-arid areas of north-eastern Ethiopia. Data from field experiments conducted in the region for two consecutive years (2015 – 2016) were used to investigate the effect of potassium (K) and NPSBZn-blended fertilizer (BF) inputs on the drought response of sorghum through analysis of gas exchange, dry matter accumulation and growth parameters. Leaf gas exchange properties varied strongly with K and BF application both under normal rainfall and drought conditions. Data taken at anthesis in drought-exposed sorghum indicated reduction of net photosynthetic rate (AN) with BF supply. AN declined from 15.7 µmol CO2/m2/s in the control to 13.4 µmol CO2/m2/s with application of 164 kg/ha BF. However, higher total dry matter yield was recorded at maturity in response to blended fertilizer and K inputs. Increasing supply of NPSBZn-blended fertilizer was associated with declining leaf K content, increasing intercellular CO2 concentration and water use efficiency (WUE) during anthesis. Significant variations in crop growth rates were also observed in response to K and BF inputs. At physiological maturity, net assimilation rate (NAR) increased with K and BF inputs both under drought and normal rainfall conditions. In general, K application modulated the response of sorghum to BF input under both normal rainfall and drought conditions. Therefore, grain sorghum could benefit from early supply of K and BF fertilizer in drought prone areas of Northeastern Ethiopia.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : East & Southern Africa |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | blended fertilizer, chlorophyll, drought, gas exchange, growth, sorghum |
| Subjects: | Mandate crops > Sorghum Others > Drought Others > Fertilizer Applications Others > Plant Growth |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 15 Jan 2025 03:45 |
| Last Modified: | 15 Jan 2025 03:45 |
| URI: | http://oar.icrisat.org/id/eprint/12906 |
| Official URL: | https://onlinelibrary.wiley.com/doi/full/10.1111/j... |
| Projects: | Agricultural Growth Program-II |
| Funders: | Ethiopian Institute of Agricultural Research |
| Acknowledgement: | UNSPECIFIED |
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