The Response of Canola (Brassica napus L.) Cultivars to Different Soil K/Mg Ratios in Greenhouse Conditions

Résumé fourni par la source

To investigate the effects of different levels of available potassium (K) and magnesium (Mg), and their interactions, on the growth characteristics of canola cultivars, a factorial experiment was conducted using a completely randomized design (CRD) with three replications in a pot culture. The first factor consisted of five combinations of the K to Mg ratio (existing conditions, 80%, 90%, 110%, and 120% of the existing condition) by adding potassium or magnesium sulfate. The concentration of available K+ and Mg2+ in the existing conditions of soil was 237 and 206 mg kg-1, respectively (K+/Mg2+ ratio 1.15). The second factor included three canola cultivars (Zafar, Dalgan, and Hyola50). After eight weeks (prior to flowering), the plants were harvested and shoot dry weight (SDW), the concentration of K, Mg, sodium (Na), and calcium (Ca) in the soil, shoots, and roots were measured. Based on the results, the Hyola50 cultivar preferred further amounts of K+ to Mg2+ (110%). Still, the Dalgan cultivar preferred higher amounts of Mg2+ (90%) (10.8 and 9.6 gr pot-1 SDW, respectively, for Hyola50 and Dalgan). The highest K concentrations in the shoots of the Dalgan (5.10%) and Zafar (4.4%) cultivars were observed at the 120% ratio. The K concentration in the roots of all cultivars (0.928%) was lower than that in the shoots (4.13%). The Hyola50 cultivar demonstrated a greater need for K+ than Mg2+ in the soil and was found to be less K-efficient compared to the Dalgan and Zafar cultivars. It is not suggested to maintain a consistent K+/Mg2+ ratio in the soil for all canola cultivars.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.