As the main agricultural technology of our province, the corn drip irrigation water fertilizer integration technology has been demonstrated and popularized in a large area in semi-arid areas in recent years. Gao Yushan introduced that through the application of water and fertilizer integration technology, the per mu yield of corn in the demonstration field has reached more than 800 kg, more than 200 kg more than that in the conventional production field, the water use efficiency has increased by more than 40%, and the fertilizer use efficiency has increased by more than 30%. The yield increase, income increase, water saving and fertilizer saving effect is remarkable.

"What kind of corn is this?" "How much grain can be harvested with this technology?". This is the demonstration area of black land protection and utilization achievements and high-tech achievements of Jilin Academy of Agricultural Sciences, which is the focus of this Agricultural Expo. Many farmers gathered here to ask about technology and listen to explanations. At the Changchun Agricultural Expo, protective tillage technology, black land protection machinery, water and fertilizer integration technology and other black land protection remedies can be seen everywhere.

"The integrated technology of water and fertilizer for corn drip irrigation is to dissolve the fertilizer in water according to the law of water and fertilizer demand of corn, as well as the supply of soil water and fertilizer, and deliver the fertilizer to the root of corn regularly, quantitatively, evenly and accurately through the pipeline water delivery system at different growth stages of corn." said Gao Yushan, a researcher at the Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences. In brief, it means fertilizing while irrigation, meeting the needs of corn for water and nutrients in different growth stages, and realizing synchronous, small amount, multiple times, and accurate management of water and fertilizer.

As the main agricultural technology of our province, the corn drip irrigation water fertilizer integration technology has been demonstrated and popularized in a large area in semi-arid areas in recent years. Gao Yushan introduced that through the application of water and fertilizer integration technology, the per mu yield of corn in the demonstration field has reached more than 800 kg, more than 200 kg more than that in the conventional production field, the water use efficiency has increased by more than 40%, and the fertilizer use efficiency has increased by more than 30%. The yield increase, income increase, water saving and fertilizer saving effect is remarkable.

If there is any benefit to the protection of black land by using the integrated technology of straw returning to the field, Gao Yushan opened a conversation box: "The integrated technology of straw returning to the field in full depth, drip irrigation, water and fertilizer has realized the efficient use of water and fertilizer and other resources; it has realized the combination of planting and breeding, increased carbon and fertilizer, and improved the amount of arable land; it has realized the leap of corn per mu yield from 400~600 kg to 700~900 kg."

In addition, the exhibition area also shows the alternate wide and narrow row leisure planting technology of corn. "The wide and narrow row planting technology is to change the traditional uniform ridge planting into different ridge spacing planting with 80~90cm wide rows and 40~50cm narrow rows. This way, straw mulching can be used to return the field, and before the jointing of corn, the wide rows can be combined with top dressing for strip deep loosening." Gao Yushan introduced that a large amount of straw can be returned to the field by leaving high stubble and straw strip covering during harvest, In autumn, the strip rotary tiller is used to carry out shallow rotary tillage and land preparation in wide rows in the same year, as the seedling belt of the next year, so as to realize inter annual rotation of seedling belt. This not only solves the environmental pollution problem of straw burning, but also can prevent water and soil loss, reduce soil moisture evaporation, and achieve the purpose of soil conservation, water conservation, and land cultivation.

The protection of black land cannot be separated from agricultural machinery equipment. There are many large-scale agricultural machinery equipment displayed in the exhibition area. Agricultural machinery for straw returning and straw deep turning can combine agricultural technology with agricultural machinery to make efficient use of straw. In the exhibition area, the scientific and technological achievements exhibition of the Northeast Region Corn Straw Comprehensive Utilization Collaborative Innovation Alliance was also held, showing a number of achievements in the research, development and application of corn straw comprehensive utilization technologies in the Northeast region, such as corn straw and livestock manure bacteria enzyme linkage fast composting technology, corn "one turn two free" straw full return rotation technology, key technology of soil ploughing operation, etc.

The Changchun Agricultural Expo has built an exchange platform for farmers to systematically learn farming techniques and intuitively feel the protection of black land by giving them the ability to last for a long time.