Study on Leaf Senescence of Super-high Yield Spring Maize During Flowering and Heading Period on Different Film-covering Modes

This experiment usedr ND314, established covering film between furrows(SPF), covering film up furrows(UPF) and non-mulching(NPF), studied systematically protective enzyme activity, photosynthetic characteristics and yield of super-high yield spring maize during flowering and heading period on different horizon leaves. The results showed that super-high yield spring maize during flowering and heading period, POD activity of different horizon leaf was inferior leafspike leafsuperior leaf, CAT, SOD activity were superior leaf spike leaf inferior leaf. In the filling stage, photosynthetic rate, stomatal resistance, transpiration rate were spike lea superior leaf inferior leaf. In the milk stage, photosynthetic rate, stomatal resistance, transpiration rate were superior leaf spike leaf inferior leaf. The results further indicated that the treatment of covering film between furrows improved the net photosynthetic rate, POD activity, CAT activity and SOD activity of maize superior leaf and spike leaf, decreased its transpiration rate, maintained maize leaves physiological function in anthesis maturity period, prolonged leaves functional period, guaranteeing grain filling, increased yield and realized super-high yield.