Fig. 1
The amino acid and soluble protein content in boll wall with different planting densities in 2017. D1-D5: 15 000, 25 000, 45 000, 60 000, and 75 000 plants per hectare. The vertical bar represents S.E. of the mean (n = 3) when the value exceeds the size of the symbol. Lowercase letters indicate significance analysis among amino acids, and capital letters indicate significance analysis among soluble proteins. The same letter among treatments is not significantly different (P ≥ 0.05)