Ecological safety threshold tester switching over plant water culture and mist culture

Abstract

The invention belongs to the technical field of plant soilless culture, and relates to a soilless culture testing device, in particular to an ecological safety threshold tester switching over plant water culture and mist culture which comprises a closed testing box. A planting plate is horizontally mounted in the testing box, a plurality of planting cups are arranged in the planting plate in a single-row manner, a nutrient solution pipe is arranged on the lower portion of the planting plate along the extension direction of the testing box and communicated with an external nutrient solution box, and a plurality of fog-drop dual-purpose sprayers are uniformly mounted in the nutrient solution pipe at intervals.

Description

Technical field [0001] The invention belongs to the technical field of plant soilless culture, and relates to a soilless culture experiment device, in particular to an ecological safety threshold experiment machine that switches between plant hydroponics and mist culture. Background technique [0002] Hydroponic culture and spray culture are the two most important methods for supplying nutrient solution in soilless cultivation of plants. Hydroponic culture refers to the cultivation method in which plant roots directly contact the nutrient solution without using a substrate. At present, most hydroponic devices directly immerse plant roots in nutrient solution for growth. Compared with soil culture methods, hydroponics can directly supply the elements needed by plants without the loss of nutrient elements, which can improve the need for plants. The absorption efficiency of elements promotes plant growth, but long-term soaking in nutrient solution will also cause hypoxia in plant ro...

AI Technical Summary

Problems solved by technology

At present, most hydroponic devices grow by soaking the plant roots directly in the nutrient solution. Compared with the soil culture method, hydroponics can directly supply the elements needed by the plants without loss of nutrients, and can improve the plant's ability to The absorption efficiency of elements can promote plant growth, but long-term immersion in nutrient solution will also cause plant root hypoxia, which will affect root respiration. In addition, roots will produce root exudates during growth, and some substances secreted by roots affect the normal growth of plants

Aeroponics refers to compressing the nutrient solution into an aerosol and spraying it directly on the plant roots, usually every 2-3 minutes. Aeroponics can not only ensure the full absorption of nutrients by the plant roots, but also satisfy the needs of the plant roots. The oxygen consumption demand for growth accelerates the growth of plants and can realize the recycling of nutrient solution, but at present, the cost of a single aeroponic equipment is relatively high, and it needs to consume a lot of electric energy

[0003] When using the species sensitivity distribution method to calculate the ecological safety threshold, it needs to be supported by a large amount of toxicological data. At present, the experiment generally selects a certain toxicity evaluation endpoint, such as crop toxicity evaluation based on plant biomass or root growth or germination rate. However, the optimal toxicity evaluation endpoint was not obtained in the toxicity experiments, and the toxicity data obtained by using different toxicity evaluation endpoints for the same crop were not compared, so the uncertainty of calculating the ecological safety threshold is relatively large

Images