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Adaptive water-saving irrigation method based on dynamic drought prediction

An adaptive and arid technology, applied in forecasting, water saving, climate change adaptation, etc., can solve problems such as crop adaptation mechanism without considering different water stress, improve field water use efficiency, ensure national food security, reduce crop Effects of drought risk

Inactive Publication Date: 2019-11-15
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing real-time irrigation decisions do not consider the adaptation mechanism of crops under different water stresses, and do not consider or rarely consider the different drought conditions in the face of the stage, and often use the lower limit of irrigation during the growth period to make irrigation decisions.

Method used

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  • Adaptive water-saving irrigation method based on dynamic drought prediction
  • Adaptive water-saving irrigation method based on dynamic drought prediction
  • Adaptive water-saving irrigation method based on dynamic drought prediction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: a kind of adaptive water-saving irrigation method based on dynamic drought prediction, comprises the following steps, and specific flow chart sees figure 1 shown.

[0042] Step 1: Establish an evaluation method for dynamic drought levels in irrigation districts based on the soil moisture content index; this method takes the average water content of the soil layer θ as the drought index, mainly through the soil water content SW of a certain soil layer depth, the thickness of the soil layer and soil bulk density ρ soil Calculation, the specific formula is: A number of drought classes of varying degrees of aridity are assigned between the driest and wettest values ​​for a soil area.

[0043] Step 2: Build a real-time prediction model of soil moisture based on the principle of water balance; the real-time prediction model of soil moisture combined with short-term weather forecasts calculates the average moisture content θ of the soil layer on the i-th day....

Embodiment 2

[0072] Embodiment 2: An adaptive water-saving irrigation method based on dynamic drought prediction, including the following steps, see the specific flow chart figure 1 .

[0073] Step 1: Establish a method for evaluating dynamic drought levels in irrigated areas based on soil moisture content.

[0074] In this step, a dynamic drought level evaluation method is established based on the soil moisture content index. Among them, the average water content of the soil layer θ is used as the drought index, mainly through the soil water content SW of a certain soil layer depth, the thickness of the soil layer and soil bulk density ρ soil Calculation, the specific formula is:

[0075] Step 2: Build a real-time prediction model of soil moisture based on the principle of water balance.

[0076] In this step, the real-time prediction of soil moisture is mainly established based on the principle of water balance, ignoring groundwater recharge, and the precipitation P 0i , crop wat...

Embodiment 3

[0110] Embodiment 3: In Step 4 of Embodiment 1 or 2, the adaptive irrigation threshold is determined based on the crop water deficit compensation effect and according to the drought level within the forecast period. During certain development periods of crops, reducing soil moisture and inducing mild to severe water stress can prevent vigorous growth of plants, change the distribution of nutrients and water in plants, and transfer assimilates from vegetative organs to reproductive organs. When water stress is relieved Crops respond to changing water environments through changes in external morphology and adjustments in growth rate. Therefore, the soil moisture can be regulated through the appropriate upper and lower limits of irrigation, and the amount and frequency of irrigation can be reduced, thereby improving the water use efficiency of crops.

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Abstract

The invention discloses an adaptive water-saving irrigation method based on dynamic drought prediction. The adaptive water-saving irrigation method comprises the steps: building an irrigation region dynamic drought grade evaluation method through taking the soil moisture content as an index, building a soil moisture content real-time prediction model based on water balance, and judging the droughtgrade in a future prediction period based on short-term weather prediction; further determining a crop irrigation threshold value according to the pre-judged drought level; and constructing a crop real-time irrigation forecasting model, and forecasting the irrigation amount day by day in the forecasting period. Based on a crop water deficit compensation effect theory, the adaptive water-saving irrigation method innovatively provides a crop adaptive irrigation threshold value by fully considering the drought condition in the future time period, improves the defect that a single irrigation threshold value is taken in the crop growth period, and establishes the organic relation between crop irrigation and drought, so that the field water utilization efficiency is effectively improved, and the drought risk of crops is reduced, and the adaptive water-saving irrigation method has important significance in guaranteeing the national grain safety and developing efficient water-saving agriculture.

Description

technical field [0001] The invention belongs to the technical field of drought prediction and irrigation, and in particular relates to an adaptive water-saving irrigation method based on dynamic drought prediction. Background technique [0002] The shortage of water resources in northern my country and the low efficiency of water use have become important factors restricting the sustainable development of agriculture in the region. Water-saving irrigation is an important measure to solve the shortage of water resources. Real-time irrigation forecast is an effective way to carry out water-saving irrigation and realize efficient utilization of agricultural water resources. However, most of the existing real-time irrigation decisions do not consider the adaptation mechanism of crops under different water stresses, and do not consider or seldom consider the different drought conditions in the face of the stage, and often use the lower limit of irrigation during the growth perio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q10/06G06Q50/02G06Q50/06
CPCG06Q10/04G06Q10/0637G06Q10/06393G06Q50/02G06Q50/06Y02A20/00
Inventor 郝秀平马建琴张书畅刘蕾彭高辉杨学颖崔弼峰方城
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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