Effect of potassium fertilizer application on drought resistance physiological characteristics in leaf of Lilium davidii var.unicolor

A sequential field trial of semi-arid sloping tillage was conducted to study the effect of potassium fertilizer on drought resistance physiological characteristics in leaf of Lilium davidii var.unicolor during the period of florescence with the random block design of three factors.The results showed that the accumulation of MDA decreased.The content of soluble sugar,CAT activity and free proline increased with the increasing of potassium fertilizer application within 0 to 150 kg/hm2.Potassium fertilizer application was more than 150 kg/hm2,the result was opposite.The content of MDA under the no-topping treatment combinations of nitrogen 225 kg/hm2,phosphorous 150 kg/hm2,was lower than that of the other treatment combinations and the minimum appeared under the treatment combination of nitrogen 225 kg/hm2,phosphorous 150 kg/hm2,potassium 150 kg/hm2;the content of soluble sugar,CAT activity and free proline under the no-topping treatment combinations of nitrogen 225 kg/hm2,phosphorous 150 kg/hm2,was higher than that of the other treatment combinations and the maximum also appeared under the treatment combination of nitrogen 225 kg/hm2,phosphorous 150 kg/hm2,potassium 150 kg/hm2.