The ways to increase yield of three types of rice, namely, large panicle type, grain type and panicle number type, were briefly described.

Ways to increase yield of large spike type: it is required to reduce the population appropriately in the middle period and develop individuals healthily at the same time, so as to increase the dry matter production per plant and improve the summary rate of the population. The number of effective panicles per mu 1.5-0.22 million, and the number of filled grains per panicle is 70- 1.30. Hybrid rice planting and? Small group, strong individual? It belongs to this type.

Ear-grain balance type: the population and individuals develop properly, so that the number of grains per ear is well coordinated and unified. The effective panicle per mu is about 300,000, and the full panicle is about 60. Most conventional short-stem and short-stem varieties use this method to increase yield.

Ways to increase the yield of multi-spike: by increasing the basic seedlings, the population is large and the individuals are small. The number of ears per mu is about 400,000, and the number of grains per ear is 45-50. This method of increasing yield is suitable for the situation of tight season and short vegetative growth period in the field, and tillering ears are rarely used.