Index method for diagnosing degree of water shortage of crop

Abstract

The invention relates to an index method for diagnosing the degree of the water shortage of a crop. The method comprises the following steps of: placing a reference crop which cannot generate transpiration at a place with the same environment as the detected crop, wherein delta T in the index formula for diagnosing the degree of the water shortage is temperature difference between a canopy of an actual reference crop and the canopy of the detected crop; delta TP is the temperature difference between a potential or maximum canopy of the reference crop and the canopy of the detected crop; meanwhile measuring the temperature of the canopies of the reference crop and the detected crop and substituting the temperature difference into the formula to calculate the CWSI; and quantizing and determining the degree of water shortage of the detected crop. The method has the advantages of few detection parameters, no complex calculation or multi-factor detection accumulative error, reliable data, capability of detecting in a non-contact way and economy and practicability.

Description

Technical field: The invention belongs to the technical field of agricultural irrigation, in particular to an index method for diagnosing the water shortage degree of crops. Background technique: The growth and development of crops requires many environmental factors. When changes in these environmental factors have harmful effects on crops, it is called stress. Crops are often subjected to various environmental stresses during their growth. Studies have confirmed that the impact of water deficit on crop growth and yield exceeds the sum of all other stresses. Therefore, water is an important basic resource for agricultural production, and crop water management is one of the most important measures in crop production. Generally speaking, the root active layer (0-90cm) suitable for the normal growth and development of crops has a soil water content of 60%-80% of the field water holding capacity. If it is lower than this water content, it should be irrigated in time. Soil wa...

AI Technical Summary

Problems solved by technology

Although morphological indicators can be used to judge the water shortage of crops, there is a lag period in the morphological changes of crops caused by water shortage. When the above water shortage symptoms appear in the form, the physiology has already been damaged to a certain extent.

In addition, water shortage is not the only cause of crop morphological changes. Even if crop morphological changes are monitored, it is difficult to quantify the degree of water shortage.

2. Plant water potential: The measurement of plant water potential is considered to be the most direct method to understand the degree of plant water deficit, but direct measurement of leaf water potential requires in vitro detection, which is destructive to plants

Although the application of fuzzy logic algorithm can eliminate the unreasonable situation of CWSI exceeding 0-1, the existing problems are also obvious

1. In the fuzzification process, the influence weight of each influencing factor must be artificially specified, and experience accounts for a considerable proportion; 2. The number of parameters that need to be measured is almost the same as that of the theoretical model, and there are still many parameters, and the advantages are not obvious

Images