Effect of Foliar Application of Maxi-grow And Potassium on Growth, Yield And Nutrient Content of Lettuce (lactuca Sativa L.) under Plastic House Condition

The research was carried out in a plastic house at the Malta station  research  farm Duhok, kurdistan region/ Iraq. In autumn 2019 growing season to study influence  of foliar spraying by seaweed extract (Max grow) with concentrations of  (0, 3, 6, and 9 ml.l-1) potassium( 0, 1.5 3 g.l-1 )on lettuce teresa on vegetative  growth, yield  and its chemical content leaves. application of potassium done 10 days after transplanting repeated time interval days. Result should that significantly increased (head weight, head diameter, leaf width, dry N,P,K Yields). Also, gave highest value Ca concentration. However, interactions between two factors all parameters where studied compared control