| There are two types of purslane in China, the wild type and the cultivated type. In order to make full use of environments and exploit the purslane’s nutritive value, both types of purslane were used as materials in this paper to compare their growth and nutritional qualities from different aspects. Results are as follows:No matter where they grew in the incubator or in field, the biomass per plant of the two types of purslane were similar, and the cultivated type had a certain advantage in growing and yield. Their nutritional qualities represented by vitamin C and total flavonoids were quite high, the nutritional quality of wild type was significantly higher than that of the cultivated type, and the nutritional quality of 25d-old purslane was higher than that of the 15d-old purslane. The environment in the incubator was more suitable for purslane to accumulate flavonoids, while vitamin C contents were similar in both environments. The mineral nutrition of wild purslane was more balanced than that of the cultivated type, and the purslane’s mineral nutrition growing in the field was more balanced than that growing in incubator. Contents of nitrate and heavy metals in both 15d-old and 25d-old purslanes growing in both environments did not exceed the limitation standards. The oxalic acid content in 25d-old purslane, which was similar to high oxalate vegetables such as spinach, was lower than that in 15d-old purslane.Stress of high temperature, high humidity in air and drought in soil provided by stuffed greenhouse as well as stress of moderate and mild drought promoted both growth and nutritional quality of two types of purslane. Their mineral nutrition content fell in the stuffed greenhouse, and heavy metals content in the cultivated purslane increased under both stresses.Both organic fertilizer and compound fertilizer promoted the growth and nutritional quality of wild purslane, and the compound fertilizer was better. Organic fertilizer had no effect on the growth of cultivated purslane, but compound fertilizer could promote notablely. Both fertilizers could improve the cultivated type’s nutritional quality, and their promoting effects were similar. They also decreased the mineral nutrition content and heavy metal content in both types, and the wild type decreased more significantly.The growth of the cultivated purslane was not correlated with the application amount of the microbial mineral organic fertilizer (OF). The growth of the cultivated type reached the best when the OF application amount was 67g/kg. Application of 6.67g/kg compound fertilizer (CF) would cause serious damage to the cultivated purslane, and combined application of OF would ease the damage. OF application improved its nutrition quality, and the combined application of OF and CF could improve the culvated perslane’s nutrition quality comprehensively. Fertilizer treatment decreased the mineral nutrition content as well as heavy metal content in the cultivated purslane.Fatty acid compositions and contents of the two types of purslane growing in the incubator were similar, and a-linolenic acid content was the highest. The relative contents of unsaturated fatty acids in both types reached 75%, and the wild type’s was slightly higher than the cultivated type’s. Stress treatments as stuffed greenhouse and drought decreased the fatty acids values of both types, especially the cultivated type. The purslane’s fatty acid value growing in stuffed greenhouse was higher than that under drought stress. OF application could increase the fatty acid value of the cultivated type, and the improved effect on the fatty acid value of combined application of OF and CF was better. |
PDF Full Text Request