Dry land farmland water potential soft measuring method based on microenvironment information and soft measuring network

Abstract

The invention relates to a dry land farmland water potential soft measuring method based on microenvironment information and a soft measuring network. The method comprises the following steps of: selecting and determining auxiliary variable of farmland water potential soft measurement; setting a corresponding sensor according to the auxiliary variable; processing the collected data and generating input data; constructing a farmland water potential soft measurement model, training and checking the soft measurement model by using the sample data obtained in a test; and sending the preprocessed data to the farmland water potential soft measurement model to obtain the farmland water potential estimation value. The soft measuring network comprises a plurality of subnetworks and an accurate irrigation decision centre which performs data communication with the plurality of subnetworks through GSM (Global System for Mobile Communications) / GPRS (General Packet Radio Service), wherein the subnetwork consists of a farmland water potential soft measurement station and a plurality of network nodes. The invention can realize automatic and continuous monitoring of the farmland water potential, timely and accurately reflect the moisture stress state in the growing process of dry crops and realize automatic and continuous monitoring of parameters of various agricultural microclimates.

Description

technical field [0001] The invention relates to a dryland farmland water potential soft-sensing method, in particular to a dryland farmland water-potential soft-sensing method and a soft-sensing network based on micro-environmental information. Background technique [0002] Modern agriculture is moving towards precision. As an important subsystem of precision agriculture, Precision Irrigation (PI) puts more emphasis on the support and guarantee of high-tech for high-efficiency and water-saving agriculture. Continuous and automatic acquisition of dryland farmland water potential (soil water potential ψ s , Crop leaf water potential ψ L and atmospheric water potential ψ a collectively) is a prerequisite for the realization of precision irrigation. Among them, the atmospheric water potential ψ a The automatic monitoring technology is relatively mature; the soil water potential ψ s The automatic monitoring technology has also made great progress; among the three existing cr...

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Problems solved by technology

Among them, the atmospheric water potential ψ a The automatic monitoring technology is relatively mature; the soil water potential ψ s The automatic monitoring technology has also made great progress; among the three existing crop leaf water potential detection methods, the liquid phase balance method and the pressure balance method are traditional methods. Automatic monitoring; the gas phase equilibrium method is relatively advanced, and can be used for continuous automatic monitoring of crop living (leaf) water potential, but the crop leaves must be placed in a well-sealed sample chamber, and there are very high requirements for temperature measurement accuracy and resolution (usually high-precision thermocouple temperature sensor)

Generally speaking, the automatic monitoring technology of crop leaf water potential in dry land is still in the early stage of development. At present, my country's crop leaf water potential detection instruments mainly rely on imports, which are expensive and inconvenient to maintain. It is difficult to promote and use them in facility agriculture and open field farmland. One of the bottlenecks of irrigation

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