When did hybrid rice begin to be officially popularized?

Hybrid rice was approved in 1979, and changed from 1973 to 1979. There was no formal promotion, and it was widely promoted after 1990.

Two rice varieties with certain genetic differences and complementary characters are selected to cross to produce the first generation hybrid with heterosis, which is hybrid rice.

Generally, hybrid rice only refers to the first generation hybrid formed by crossing two sterile lines and restorer lines with the same genetic background. The large-scale popularization of hybrid rice mainly uses rice male sterile lines as genetic tools.

Extended data:

With the application and popularization of hybrid rice, the yield per unit area has been increased and the seed consumption has been reduced. Direct seeding cultivation technology of hybrid rice is a simplified cultivation method, which saves the traditional process of rice cultivation and seedling raising, and directly sows the soaked and germinated rice seeds into the field for management, so that they grow into seedlings, tiller and mature.

Apply according to soil characteristics. For the soil with serious potassium deficiency, the effect of applying potassium fertilizer is remarkable. Potassium fertilizer should be used in combination with nitrogen and phosphorus. Only under the premise of reasonable collocation of the three elements, the effect of increasing potassium fertilizer can be fully exerted.