Method for determining water demand of detected plant by utilizing water demand information of indicator plant

Abstract

The invention discloses a method for determining water demand of a detected plant by utilizing water demand information of an indicator plant. The method comprises the following steps: first, planting an indicator plant and a detected plant at a same time in the same environment by a same cultivation method; respectively measuring a CO2 response curve of leaf photosynthesis of the detected plant and the indicator plant by a portable photosynthesis apparatus through a conventional method; second, on the basis of net photosynthetic rate and transpiration rate of the detected plant and the indicator plant under different carbon dioxide concentrations in the CO2 response curves measured by the portable photosynthesis apparatus, calculating water utilization rate of the detected plant and the indicator plant under different carbon dioxide concentrations; third, fitting the water utilization rate data of the detected plant with the water utilization rate data of the indicator plant under a corresponding carbon dioxide concentration into a proportional function; and acquiring an oblique ratio of the above equation, so as to obtain a water utilization coefficient of the detected plant; fourth, respectively determining net photosynthetic rate of the detected plant leaf and the indicator plant leaf by using the portable photosynthesis apparatus through a conventional method; and fifth, according to the water utilization coefficient of the detected plant, the net photosynthetic rate of the detected plant leaf and the indicator plant leaf, and the water demand of the indicator plant, acquiring the water demand of the detected plant.

Description

technical field [0001] The invention relates to the fields of agricultural engineering and horticulture, in particular to a method for determining the water demand of investigated plants by utilizing the water demand information of indicating plants. Background technique [0002] China is a large agricultural country with very scarce water resources, and a large country with poor water resources. At present, the per capita water resources are only 2140m 3 , which is only 1 / 4 of the world's average level, and severe water shortages have occurred in parts of the north and west. Water is crucial to the growth of crops. Under the premise of ensuring stable and high agricultural production, how to accurately, easily and quickly measure the water demand information of plants, so as to achieve timely irrigation and water stoppage, and realize water saving and production increase are very urgent and urgent. important task. [0003] For a long time, people have done a lot of resear...

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Problems solved by technology

[0010] It can be seen from the above that obtaining the water demand of crops is a relatively cumbersome task, especially for new plants, without too much research, it is extremely difficult to determine the water demand of plants, and then determine the amount of irrigation water

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