What is the demonstration and leading role of improved varieties and good laws?

The function is to guide farmers to plant scientifically and improve the efficiency and quality of agricultural production by popularizing excellent varieties and advanced cultivation techniques in agricultural production. This method can effectively improve the yield and quality of crops and promote the sustainable development of agriculture. This method has been widely used in China. For example, in the treatment of saline-alkali land, China has gradually formed a trinity of "fertile land+improved varieties+good methods", which has successfully improved the soil quality and yield of saline-alkali land.