In order to solve the problem of poor uniformity of sowing operation, a wheat mechanized sowing control system based on STM32 single chip microcomputer is designed. The wheeled driving robot could travel with variable speed. According to the real-time driving speed of the wheeled driving robot, the speed of the seeding motor is controlled to realize the variable speed and uniform seeding. The system used multi-stage control of DC motor speed. The real-time speed signal of the wheeled driving robot is used for The first-stage control parameter, which is controlled by PID. The real-time current and speed of the seeder motor are used for secondary control parameters, which is controlled by fuzzy PID. Simulation results show that the control algorithm has short response time, small overshoot and good control effect. The results of sowing experiment have shown that the control accuracy of seeding amount under constant speed condition is 96.8% and that under variable speed condition is 95.1%.

“Double carbon” has become the key task of Chinas agricultural green development. It is urgent to reduce agricultural greenhouse gas emissions in order to achieve the carbon neutral goal of 2060. This paper reviews the research progress and development trend of agricultural carbon emission in China in recent years, summarizes the research on the six major emission sources of agricultural materials, rice planting, carbon fixation of cultivated land, straw burning, livestock and poultry breeding and agricultural machinery, and publishes the suggestions and prospects for carbon emission reduction of the six major agricultural emission sources. The research shows that there are many empirical analysis on the agricultural carbon emission intensity of the five major agricultural emission sources of agricultural materials, rice planting, straw burning, livestock and poultry breeding and agricultural machinery, and the carbon emission reduction effect is significant, because of the effective regulation of its carbon emissions and the impact of strengthening the purchase subsidy policy. However, there is less empirical analysis on the carbon sequestration of arable land, and the process of carbon emission reduction is slow, mainly due to the greater impact of the subjective factors of farmers, so we should strengthen the publicity and learning of farmers. Although Chinas total agricultural carbon emissions fluctuate up and down, they tend to decline as a whole. In order to achieve green and sustainable development, the government and the whole people need to work together. The implementation of lowcarbon agriculture is conducive to achieving the 2060 carbon neutral goal.

 In order to solve the problems of fog drop loss and low pesticide utilization rate in the application process of hedge frame crops, a crawler selfwalking double tunnel sprayer was designed in this paper. The working principle of the machine was analyzed and the crawler chassis was designed. The minimum clearance of the chassis was 289 mm. An air delivery system was designed to increase the amount of fog drop deposition and reduce the droplet drift loss of hedge frame crops. The tunnel width expansion device was designed, which meet the application width of different crops, and the width expansion range was 600-1 200 mm. The number and layout of spray heads were designed. Based on the EDEM-Fluent coupling simulation, the state of fog droplets in different widths was studied. Under different widths, compared with the condition without wind, fog droplets were denser, and particles moved faster, which was more conducive to the deposition of fog droplets. A prototype was developed, and field tests were carried out. The results showed that the DR value of fog droplet uniformity increased by 8.45% under windy conditions. In windy conditions. The average value of DR was 0.85 in 900 mm, which was closer to 1. Finally, the test results were consistent with the simulation results. This study provided a new reference for the design of tunnel sprayers.

In view of the low degree of automation and energy utilization efficiency of the edible fungi drying industry at present, a temperature and humidity control system of edible fungi multienergy complementary drying room was designed to realize the automatic control of temperature and humidity in the drying process and improve the drying efficiency. The system used Siemens S7-200 PLC as the control core, and the drying process was divided into four drying substages and one medium short wave infrared drying stage based on the drying process of splitrange variable temperature. The data acquisition was completed through the temperature and humidity sensor, and the effect of heating and dehumidification was achieved by controlling the onoff of the relay, to realize the purpose of drying. It was found that the system ran stably，the expansion heat collection plate board and rainproof cloth realized automatic unfolding and recovery, and medium short wave infrared lamps turned on and off stably. Also, dehumidification operation was normal, the temperature control precision was ±0.8 ℃，the drying time of lentinus edodes was 12 hours, and the drying efficiency was higher than that of traditional drying equipment.

Aiming at the problems of poor sowing quality, poor stability of sowing depth, and low degree of compound operation of wheat sowing machine, a double axis rotary tillage and pressing groove sowing, ditching, and even covering soil machine was designed. This paper analyzed the working principle of the machine and, according to the actual operation needs, designed a transmission system and calculated the transmission efficiency of the whole machine, which was 0.716. In order to open 5 cm wide and 1-3 cm deep wheat seed trough stably, a special slotted wheel was designed to ensure the sowing depth and improve the stability of sowing depth and width. According to the working width of 3 500 mm and the sowing depth of 1-3 cm, the parameters of the length and diameter of the auger were determined, and a ditching and even covering soil device was designed. The left and right two-stage auger mechanism was used to improve the soil flatness within the range of tillage. A soil cleaning device was also designed with left and right two-stage auger mechanisms. The results showed that the accuracy of the prototype was 88.67%, the dispersion was 45.45%, the uniformity was 73.74%, the accuracy of the ordinary seeder was 78.72%, the dispersion was 39.38%, and the uniformity was 44.83%.