During his stay in War of Resistance against Japanese Aggression, he cooperated with Guangxi Agricultural Experimental Field and some regional farms to conduct fertilizer field experiments for seven years. There are farm manure such as green manure, compost and manure, nitrogen, phosphorus, potassium fertilizer and lime in the experimental treatment. Dai Hong undertook the whole process of technical guidance from fertilizer test design, data recording, sorting out and statistical analysis of test results, and writing test reports. This experimental work was in the leading position in China at that time. He also trained a group of grass-roots agricultural technical cadres engaged in fertilizer field experiments for Guangxi, actively promoted the techniques of accumulation, planting, preparation and application of farm manure such as green manure and compost, and made contributions to promoting agricultural production in Guangxi, especially grain production.
In the early 1960s, the output of ammonia water in China increased greatly, but farmers were not used to it. Due to improper storage and use, rice seedlings were often burned and nitrogen was lost by volatilization. Dai Hong cooperated with the scientific and technical personnel of Shanghai Research Institute of Chemical Technology to carry out the experiment of rational application of ammonia water for nitrogen conservation, and publicized it to farmers in time, which improved the use effect of ammonia water and made agricultural ammonia water one of the main nitrogen fertilizer varieties in Shanghai suburbs.
1963, according to the spirit of the national fertilizer networking work conference, he organized Shanghai fertilizer-related scientific research, production, supply and marketing, education, soil and fertilizer society, municipal and county agricultural bureaus and other units to form a Shanghai fertilizer test cooperation group to carry out fertilizer field tests focusing on determining the fertilizer efficiency of phosphate fertilizer. It took three years to find out the fertilizer efficiency, yield-increasing effect and economic benefit of applying phosphate fertilizer in different areas, different crops and different soils in Shanghai suburbs, which opened up a new situation for the application of phosphate fertilizer.
In the fertilizer field experiment, he always emphasized that the experiment must be closely combined with demonstration and extension, and attached importance to the role of grass-roots agricultural extension stations and supply and marketing cooperatives. He believes that the scientific research work of soil and fertilizer must go deep into farmers and serve agricultural production, so as to have vitality and benefit the national economy and people's livelihood. The fertilizer experiments he presided over all followed this goal. In the early 1960s, almost all of the 100 fertilizer test sites he set up in the suburbs of Shanghai were located in social organizations and teams. Regardless of his old age and infirmity, he often went deep into the fields to give on-the-spot guidance, striving to quickly serve the local agricultural production at that time, and achieved obvious social and economic benefits.