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A method for judging crop irrigation time point based on rewatering water use efficiency

A time point, moisture technology, applied in the direction of using substances to absorb and weigh, can solve problems such as poor pertinence and inability to fundamentally relieve soil drought.

Active Publication Date: 2017-01-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the present invention proposes a method for judging the time point of crop irrigation based on the water use efficiency of rehydration, so as to overcome the problems that the traditional irrigation technology and the selection of irrigation time are not pertinent and cannot fundamentally relieve the soil drought. Fully consider the crop's own water deficit regulation function and water-saving characteristics

Method used

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  • A method for judging crop irrigation time point based on rewatering water use efficiency
  • A method for judging crop irrigation time point based on rewatering water use efficiency
  • A method for judging crop irrigation time point based on rewatering water use efficiency

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Effect test

Embodiment 1

[0099] The leaves of Zhuge Cai with the same growth were taken for dehydration and rehydration treatment. The net photosynthetic rate and leaf water potential of Zhuge Cai during the dehydration and rehydration processes were measured respectively by using the portable photosynthetic measurement system Li-6400 and the Psypro dew point water potential meter, and the before and after rehydration were calculated. Net photosynthetic rate and water content increase value ΔP of leaves of Zhugecai Nl^(l-x) and ΔWC * l^(l-x) , and finally calculate the rehydration water use efficiency of Zhuge Cai Among them, l is the osmotic stress level of Zhugecai leaves before rehydration, and l-x is the osmotic stress level of Zhugecai leaves after rehydration, where l>1, l>x>0, x, l are positive integers, and l∈ 2, 3, 4, 5. Rehydration water use efficiency WUE of different rehydration degrees of Zhuge vegetable R , mmol CO 2 / mol H 2 O, the result is as figure 1 shown.

[0100] from fi...

Embodiment 2

[0102] Lettuce leaves with consistent growth were taken for dehydration treatment, and the net photosynthetic rate and leaf water potential of lettuce during the dehydration and rehydration processes were respectively measured by the portable photosynthetic measurement system Li-6400 and Psypro dew point water potential meter, and the lettuce leaves before and after rehydration were calculated. Net photosynthetic rate and water content increase ΔP Nl^(l-x) and ΔWC * l^(l-x) , and finally calculate the rehydration water use efficiency of lettuce Where l is the osmotic stress level of lettuce leaves before rehydration, l-x is the osmotic stress level of lettuce leaves after rehydration, where l>1, l>x>0, x, l are positive integers, and l∈2, 3, 4, 5. Rehydration water use efficiency WUE of lettuce with different rehydration degrees R , mmol CO 2 / mol H 2 O, the result is as figure 2 shown.

[0103] from figure 2 It can be seen from the figure that when lettuce leaves ...

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Abstract

The invention discloses a method for judging the crop irrigation time point based on the water use efficiency of rehydration, which comprises the following steps: first, five osmotic stress levels are simulated and set. Second, the osmotic stress treatment is carried out on the leaves of the crops. Third, the crop leaves are rehydrated. Fourth, measure the net photosynthetic rate and leaf water potential of the investigated crop leaves. Fifth, calculate the different rehydration water use efficiency WUER of crop leaves. The invention can accurately predict the time point of crop irrigation, and the water demand information is directly collected from the crop itself while taking into account the physiological characteristics of the crop itself, and is not affected by complex meteorological conditions such as soil, environment, weather, etc. The required crop materials are easy to obtain, and the steps adopted are few , the calculation is simple, and can be applied to accurately guide the irrigation time of crops and realize water-saving irrigation.

Description

technical field [0001] The invention relates to a method for judging the crop irrigation time point based on the water use efficiency of rehydration, and belongs to the application field of agricultural crop water saving technology. Background technique [0002] Water is one of the main factors affecting the growth and development of crops. In different growth and development stages, crops have different requirements for water. Therefore, reasonable irrigation has a positive effect on the growth and development of crops and the improvement of yield. The traditional irrigation system, especially the establishment of irrigation time, is mostly based on soil research or remote sensing technology. The real water-saving technology needs to fully consider the role of crop physiological functions in crop water deficit regulation. The traditional determination of irrigation time Most of the methods are not targeted and can not solve the problem of soil drought fundamentally. Theref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/02
Inventor 邢德科吴沿友周贵尧赵宽张明明
Owner JIANGSU UNIV