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King Abdulaziz University (2020)

Effect of Potassium Fertilizer on the Tolerance of Grain Sorghum Sorghum Bicolor (L.) to Saline Irrigation Water under Arid Land Conditions

Wulgo Umar Kyari

Titre : Effect of Potassium Fertilizer on the Tolerance of Grain Sorghum Sorghum Bicolor (L.) to Saline Irrigation Water under Arid Land Conditions

تأثير السماد البوتاسي على تحمل الذرة الرفيعة لماء الري المالح تحت ظروف المناطق الجافة

Auteur : Wulgo Umar Kyari

Université de soutenance  : King Abdulaziz University

Grade : Master of Science (MS) 2020

Résumé
The experiment was conducted in the Agricultural Research station of King Abdulaziz University at Hada Al-sham Jeddah, Kingdom of Saudi Arabia during 2018/2019 season in order to investigate the effect of Potassium fertilizer(K) (0, 100 and 200 kg/ha) on tolerance of two grain sorghum cultivars (Shandaweel and Dorado) to saline irrigation water (2500, 5000 and 7500mg/l) under arid land conditions. The experimental design was split-spilt plot design with 4 replicates. The results indicates that there were significant effects of the treatments and there interactions on the Sorghum agronomic traits, yield and yield components, quality parameters, soil physical and chemical properties (pH, EC and OM) and lastly soil macronutrients (N, K and Na). Potassium fertilizer(K) was found to be significant on panicle length, 100 grain weight, grain yield and biological yield. Irrigation water salinity of 7500 (mg/l) has significantly reduced panicle length, 100 grain weight, grain yield and biological yield, however, sub subplots fertilized with K (200kg/ha) have shown a tremendous resistance. The highest 100 grain weight, grain yield and biological yield were recorded from Dorado cultivar while panicle length is highest in Shandaweel cultivar. Potassium fertilizer(K) was proven to have a significant influence on number of leaves/plant, plant height, number of tillers/plant, number of heads/plant, panicle length, 100 grain weight and WUE (Water Use Efficiency) of sorghum. Stover yield, shelling % index, protein (%) and protein (kg/ha) all have significant variations at main and interaction effects by irrigation water salinity and K with special emphasis to (200kg/ha). The sorghum quality parameters (protein (%) and protein (kg/ha)) were as well responsive in Shandaweel and Dorado cultivar which is not the case with stover yield and shelling % index. pH and OM (Soil Organic Matter) were non-significant to all the treatments while EC (Electrical Conductivity) shows variations. Due to the salts added to the soil from the irrigation water salinity, K and Na (sodium) were found to be significant while N shows no significant effect for all the treatments except Cultivar (Shandaweel and Dorado) indicating difference in main effects. In conclusion, Potassium Fertilizer especially (200kg/ha) along Dorado and 2500 (mg/l) irrigation water salinity portrays best performance by all the studied parameters, however, in Arid regions with raised salinities ; Potassium fertilizer enhances appreciable tolerance significantly.

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Page publiée le 22 mai 2021