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以滇型三系杂交粳稻滇杂37、常规粳稻CR-4-9为研究材料,设每公顷栽12万、18万、24万、30万和36万穴5个密度水平,单本移栽,研究超稀移栽条件下高原粳稻产量和其它性状的变化。结果表明,产量随密度增加逐渐增加,至30万穴/hm2密度水平产量达到最大值杂交粳稻和常规粳稻分别为13.90和11.62 t/hm2,之后产量缓慢下降,2个品种的产量与密度回归模型分别为yA1=10.152 0+1.885 3x-0.230 7x2和yA2=9.598 0+1.061 3x-0.140 7x2;2个品种每公顷30万穴比12万穴分别增产18.20%和10.24%,达极显著水平;单株有效穗数、单株生产力、成穗率与密度呈极显著负相关,最高茎蘖数、有效穗数分别与密度呈极显著和显著正相关;超稀条件下,生育进程推迟2～6 d。高原粳稻在适当的低密度水平下可实现增产增效。
Taking Dian-type three-line japonica hybrid rice Dianza 37 and conventional japonica rice CR-4-9 as materials, five density levels of 120,000, 180,000, 240,000, 300,000 and 360,000 were planted per hectare. , To study the changes of grain yield and other traits of plateau japonica under ultra-dilute transplanting. The results showed that the yield increased gradually with the increasing of density, and the yield reached the maximum at the density of 300000 hm2 / hm2. The yield of hybrid japonica and conventional japonica rice was 13.90 and 11.62 t / hm2, respectively, and then decreased slowly. The yield and density regression models of two cultivars Respectively, yA1 = 10.152 0 + 1.885 3x-0.230 7x2 and yA2 = 9.598 0 + 1.061 3x-0.140 7x2, respectively; the output of 200000 hectares in two cultivars increased by 18.20% and 10.24% There were extremely significant negative correlations between effective spike number per panicle, single plant productivity, spikelet percentage and density. The highest tiller number and effective spikelet number had a significant and significant positive correlation with the density respectively. Under the condition of ultra-dilute, the procreation process was postponed by 2 ~ 6 d. Plateau Japonica rice can increase yield and increase efficiency under suitable low density.