Effect of Nitrogen Deficiency on Yield and Photosynthetic Traits of Cytoplasmic Male Sterility Maize Effects of Nitrogen Deficiency on the Growth, Yield and Nitrogen Use for the Super Hybrid Early Rice Expression of TaIPS Genes in Wheat Seedlings with Nitrogen and Phosphorus Starvation Response to nitrogen deficiency and compensation on growth and yield of winter wheat Effects of nitrogen stress on root radial and axial hydraulic conductivity of corn Expression Analysis of Key Enzyme Genes of Nitrogen Synthesis from Tea Tree Leave under Different Nitrogen Level Effects of Stay-green Rice Gene (SGR) Over-expression and Mutation on Some Indexes Related with Carbon and Nitrogen Metabolism in Rice Leaves Using chlorophyll fluorescence indices to estimate nitrogen deficiency of maize seedlings