A plant low temperature damage assessment and early warning system based on the accumulated air temperature deficit

Abstract

An evaluation and early warning system for plant low temperature damage based on the accumulated air temperature deficit. The evaluation and early warning system consists of four parts: a sensor, a display, a gateway and a control unit. The principle of judging the degree of plant low temperature damage is based on the use of Fv / Fm, chlorophyll a content, chlorophyll b content, total chlorophyll, F O / 50us, F k / 300us, F J / 2ms, F I / 30ms, F m A total of 9 low-temperature damage indicators are used to construct the SI model of low-temperature damage, and each physiological parameter is brought into the model SI to calculate the score. The accumulated temperature deficit is corresponding to the low-temperature damage through the SI value, and the low-temperature damage is directly monitored. and evaluation. This system evaluates the degree of low temperature damage by accumulating air temperature deficit, and judges whether plants are damaged by low temperature and monitors the degree of damage through the temperature deficit, improves the accuracy of judgment, reduces monitoring costs, and achieves energy-saving and high-efficiency technical effects.

Description

technical field [0001] The invention relates to the technical field of environmental control of horticultural facilities, in particular to a plant low temperature damage evaluation and early warning system based on accumulated air temperature deficit. Background technique [0002] Low temperature injury (chilling injury and freezing injury) refers to the temperature environment below the lower limit of the optimum growth temperature of plants, which is an important environmental limiting factor affecting plant growth and development. Low temperature stress will affect plant growth and development, photosynthetic metabolism, crop yield, quality, etc., resulting in reduced yield of horticultural crops such as vegetables, which has become an urgent problem to be solved in actual production. During the production of vegetables in solar greenhouses in winter and spring in northern my country, the daytime temperature in the facility is often lower than 20°C, and the temperature is...

AI Technical Summary

Problems solved by technology

When vegetable crops are in a low temperature environment, physiological activities will be disturbed, photosynthesis will be hindered, growth will slow down, and dry matter accumulation will decrease. Without effective early warning and preventive measures, it will eventually lead to a serious decline in yield and quality

[0003] The functions of the existing facility environment monitoring system mainly focus on the real-time monitoring of parameters such as temperature, light, substrate water content and air humidity, so as to monitor the growth environment of plants and adjust the on-demand supply of water and fertilizer. The monitoring system developed for temperature mainly Capabilities are also limited to real-time monitoring of facility air or soil temperature

At the same time, the effect of low temperature on crops is a multi-index effect, and the judgment standard determined based on a single index cannot objectively and comprehensively reflect low temperature damage. Evaluation and Early Warning System of Plant Low Temperature Injury Based on Deficit Quantity Determination