Fig. 2.

Contents of protein and total amino acids of peanut kernels under different nitrogen applicationin pod zone in SH11 and HY23. Values are shown as means ± SD of three independent biological sample. Different lowercase letters in the bar graph indicate significantly different between different nitrogen application ratesin the same cultivar at P < 0.05 according to Duncan’s multiple range test. N0, N30, N60, N90 meaning that nitrogen application ratesin pod zone were 0, 30, 60 and 90 kg·hm^− 2, respectively