1327 Figure 1 - Emergence rate of pak choi in different substrates It should be noted that in previous experiments, when the ratio of microbial fertilizer exceeded 1520%, seedlings wilt and the emergence rate dropped significantly. Taking into account the price factor of microbial fertilizer, we have ultimately determined its maximum ratio as 10%. 4.1.2 Influence on growth performance of pak choi Plant height, stem diameter, leaf number, and leaf size are key indicators for assessing crop growth. Plant height and stem diameter reflect the overall growth vigor during development, while leaf number and size indicate the rate of meristematic activity and expansion of each plant. During the entire growth period of pak choi, the growth performance was recorded every ten days. Figure 2 illustrates the ten-day growth progression of pak choi from emergence to maturity across different substrates. Table 3 shows the measured 40-day growth indicators of pak choi. Table 3 - Measured 40-day growth indicators of pak choi in different substrates Substrate No. R1 R2 R3 R4 R5 R6 R7 R8 R9 CK Plant height (cm) 18.23 20.41 19.84 20.96 23.92 22.40 22.06 26.97 23.41 24.92 Number of leaves (Nr.) 15 16 15 16 17 17 19 20 20 20 Figure 2 - Growth of plant height of pak choi in different substrates
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