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As an imported crop, date palm lacks planting management experience in China. It is imperative for the development of Chinese date palm industry to select suitable nutrients, construct the date palm rooting system quickly and efficiently, ensure the full absorption of nutrients by the roots during the field planting period, and shorten the growth cycle of date palm. In order to study the effects of different microalgae fertilizer on the growth of date palm seedlings of “Mabroom” and “Sillege” varieties, fresh microalgae (M1), fermented microalgae solution (M2), microalgae nutrient solution (M3) and microalgae circulation solution (M4) were selected to treat the seedlings. The growth and physiological indexes (leaf length, relative permeability of cell membrane, malondialdehyde MDA, peroxidase POD, catalase CAT, glutathione reductase GR) of date palm seedlings were measured. The results showed that the leaf length of “Mabroom” seedlings was significantly higher than that of the control group after treatment with microalgae nutrient solution (M3) and microalgae circulation solution (M4), and the microalgae nutrient solution (M3) and microalgae circulation solution (M4) could promote the growth of “Mabroom” seedlings. The osmotic regulation ability of leaf cells was strong. The contents of catalase, peroxidase and malondialdehyde were lower than those of the control. After treatment with fresh microalgae (M1) and fermented microalgae solution (M2), the leaf elongation length of “Sillege” seedlings was significantly higher than that of the control, and fresh microalgae (M1) and fermented microalgae solution (M2) were more suitable for the growth of “Sillege” seedlings, with fresh microalgae (M1)>fermented microalgae solution (M2). The osmotic regulation ability of leaf cells was higher than that of the control. The change of catalase content was lower than that of the control. This study showed that during the cultivation of microalgae, the microalgae nutrient solution (M3) and microalgae circulation solution (M4) could synthesize related active substances to produce primary metabolites. Such bioactive substances were absorbed by seedling roots and promoted the elongation and growth of date palm leaves. The “Mabroom” seedlings were more suitable to apply the secondary metabolites of microalgae as fertilizer. “Sillege” date palm seedlings are more suitable for fresh and fermented microalgae.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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