Figure 2. Chlorophyll a content in each of the 32 treatments after 4 months of cultivation.

Note: W10∶300 ml deionized water was added to each sample every 10 days. W5∶300 ml deionized water was added to each sample every 5 days. S: each sample was covered by a 60% shade cloth positioned 20 cm above the pot. NS: no shading. N: 2.10 g NH₄NO₃ added to each pot. NN: no NH₄NO₃ added to any pots. KP: 1.05 g KH₂PO₄ added to each pot. NKP: no H₂PO₄ added to any pots. Ca: 2.10 g CaCO₃ added to each pot. NCa: no CaCO₃ added to any pots. The capital letters indicate the different treatments, while different lower case letters above the bars indicate significant differences between any two treatments at P<0.01.