Field experiment was carried out to study the effects of different planting density on leaf growth of rice Kongyu 131 and Longjing 26 under the condition of urea fertilization amount 300 kg/hm2 and N∶P∶K proportion 1.0∶0.5∶0.5 in cold region in Helongjiang Province. The results showed that the optimum planting density for panicle number type rice Kongyu 131 were 166.5~202.5 thousands hill/hm2, the optimum planting density for heavy panicle type rice Longjing 26 were 247.5~333.0 thousands hill/hm2.
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