Effects of different plant growing material ratios on seed germination and seedling growth of Paspalum wettsteinii

Planting substrate engineering is an important technical measure for slope treatment. To explore the application of waste mushroom residue in planting substrate engineering, this study selects the waste mushroom residue of edible fungus cultivation as the organic material of substrate and PAM as a water-retaining agent and forms different planting substrates after mixing it with soil, cement, fertilizer, and Paspalum wettsteinii seeds according to different ratios. The effects of different substrate ratios on the germination and growth of Paspalum wettsteinii were studied. The results showed that different plant substrate ratios had effects on seed germination and seedling growth of Paspalum wettsteinii. With the decrease of soil ratio and the increase of mushroom residue ratio, the rate of seed germination accelerated and promoted germination and seedling growth. Seed germination and seedling growth were highest when the soil ꞉ mushroom residue ratio was 0 ꞉ 4, which was significantly higher than other ratios. The effect of PAM addition on seed germination and seedling growth of Paspalum wettsteinii is related to the ratio of soil-to-mushroom residue. When the ratio of this residue is 0 ꞉ 4, PAM addition of 2.0% accelerates the germination process. The effect of PAM addition on seed germination and seedling growth of Paspalum wettsteinii is related to the ratio of soil-to-mushroom residue. When the ratio of PAM addition is 1.0%, there is little difference in seed germination and seedling growth of Paspalum wettsteinii. However, when the addition of PAM was 2.0%, it had a certain inhibitory effect on germination and growth. The effects of the proportion of soil mushroom residue and PAM on the physiological indices of germinating seedlings are complex. The ratio of soil mushroom residue and PAM had great effects on the physiological indexes of germinating seedlings. Therefore, the high content of mushroom residue and the addition of PAM of 0.5%～1.0% were beneficial to the seed germination and seedling growth of Paspalum wettsteinii.