New varieties

In the center's early days, Zhao's team only had a few varieties of corn seeds. It lagged far behind other research institutions, which had thousands of germ plasm materials. Once, when he encountered a stranger feeding pigeons with corn, he grabbed some of the grains to use in his work.

During business trips overseas, unlike some people who preferred to go shopping, Zhao liked to wander around flower and seed stores to buy various items for his research.

In 2000, two new corn varieties were approved and promoted at the academy's demonstration base, marking the center's first batch of self-developed seeds.

Selecting and breeding new seed varieties is a long, painstaking process. The researchers need to crossbreed seeds that possess distinct advantages, identify good combinations suitable for production needs and choose a high-yield, stable new strain.

The entire process can take as long as 10 years.

The center's developmental efficiency has greatly improved since 2015, when it combined several breeding techniques and modern equipment in its work.

"Although we had limited corn material, we made a remarkable achievement by cultivating more than 80 varieties over 10 years," Zhao said, adding that one of the center's breeding techniques has been awarded a national patent.

All 50 of the new corn varieties authorized last year have been bought by seed companies, which are promoting them across large parts of the country.

Even as Zhao achieved his goal of breeding more than 100 corn varieties, planted across a total of 11.3 million hectares of farmland, he was working to make innovations in new varieties with high nutritional values and better flavors.

Sweet corn, which originated in the Americas, is the major fresh corn variety outside of China.

"We have created and bred a strain which has both sweet and waxy traits," Zhao said.

Jingkenuo 2000, a sweet and glutinous corn bred first in 2006, has been exported to the US, Vietnam and South Korea. The suffix "nuo" refers to the corn's waxy texture.

"Our products are seen in supermarkets in the US and on street stalls in South Korea that sell traditional grilled corn," Zhao said.

Nongkenuo 336, a sweet and waxy variety developed last year, has become the most popular corn on the market and is regarded by consumers as the tastiest strain, he added, noting that the flavor has been praised as an original taste at several international conferences.

Though China's total corn output has risen more than 21-fold over the past 70 years, the yield level is less than 60 percent of that in the US.

Zhao said the development of good quality, high-yield varieties will require a number of things, like the innovation of biological technologies, more investment in research and development, and improved cooperation between research institutions and companies.