Potassium pools equilibration during growth stages of two rapeseed cultivars under drought stress

ABSTRACT- Different soil potassium (K) pools including soluble, exchangeable and non-exchangeable in surface and subsurface soils may be totally used by canola roots at different growth stages under drought conditions. A field experiment was conducted for one growing season (۲۰۱۳-۲۰۱۴) to study K pools changes during growth stages of two rapeseed cultivars under drought. The experiment was arranged in a randomized complete block design with four factors including different stages of rapeseed growth (before planting, seedling, stem elongation, flowering, grain filling and harvesting), drought (full irrigation, drought from flowering and silique formation), rapeseed cultivars (Sarigol and RGS) and soil depths (۰-۱۵ and ۱۵-۳۰ cm). Soil samples were collected and soluble, exchangeable and non-exchangeable K were determined. Results showed that the contents of soluble and non-exchangeable K (NEK) decreased during the growth stages (۲۲ and ۱۹۸ mg kg-۱, respectively) while the contents of exchangeable K increased until stem elongation (۵۷ mg kg-۱) and then remained constant. Decrease in the contents of HNO۳-extractable K (sum of soluble, exchangeable and non-exchangeable K) in the topsoils was significantly more than that in the subsoils (۱۹۸ vs. ۱۴۲ mg kg-۱). Drought also had a significant effect on K pools distribution. Drought from flowering decreased the contents of NEK and HNO۳-extractable K; however, drought from silique formation had no significant effect on the contents of the different K forms. Type of rapeseed cultivar had no significant effect on K pools distribution. It is concluded that a severe decrease in HNO۳-extractable K occurs at the flowering stage (۱۷۰ mg kg-۱) and it must be considered for K fertilizers management. Decrease in NEK during the rapeseed growth supports the hypothesis that this form of K may be released during a growth season and this large pool of K may be considered in K fertility management and fertilizer recommendations. Generally, K uptake by Sarigol cultivar was significantly higher than that by RGS cultivar (۱۷۷.۷ vs. ۱۲۹.۴ kg ha-۱). Potassium uptake by rapeseed decreased by drought and this decrease was more pronounced by drought from silique formation (more than ۴۰% decrease in K uptake).

کلیدواژه ها:

Potassium forms ، Flowering stage ، Rapeseed ، Soil depth ، Drought