The Activity of Antioxidants Enzymes and NPK Contents as affected by Water Qaulity, Kinetin, Bio and Organic fertilization in Lettuce (Lactuca sativa L.)

Abstract

A field experiment was conducted using split – split block design to study the effect of irrigation water quality,organic composts,kinetin and Bio- health application on N.P.K contents and anti-oxidant enzymes activity in lettuce, The experiment included three factors,quality of irrigation water (W) at two levels (1.2, 6.1 dS m-1), kind of organic composts Plam fronds and Rice wastes(20) ton /hectare, kinetin application (50 mg.L-1) and bio-health fertilizers (5 kg/ hectare). The results indicated that elevation of water salinity levels led to elevation in activity of Peroxidase POX, Catalase CAT, Malondialdehyde MDA, Superoxide dismutase SOD enzymes and proline contents in leaves, while it decrease leaves contents of (N.P.K), Organic composts, kinetin and bio-health applications alleviated from the negative effects of saline water by increasing the (NPK) contents in leaves,reduced POX,CAT, MDA,SOD and proline, That possible to mitigation the negative affect of salt stress in lettuce the application of plant growth regulators, bio fertilizers and decomposed organic matter.