肥水条件对不同类型水稻干物质积累与分配的影响

研究了肥水条件对不同类型水稻物质积累与分配的影响。结果表明：产量与总干物质积累量显正相关，杂交稻抽穗后的物质积累优势明显，而高产常规粳稻抽穗前干物质净积累量较大；肥水充足能促进干物质的再分配，增加籽粒产量，肥水不足会对干物质的输出产生抑制作用；水稻叶片的干物质输出和转换率高于茎鞘，对产量贡献较大；直立穗型品种叶片及茎鞘的干物质输出能力均较强，对高产有利。

Effect of Fertilizer and Water Conditions on Dry Matter Accumulation and Partition of Different Types of Rice

The effect of fertilizer and water conditions on dry matter accumulation, partition and transportation of different types of rice was studied. The results showed that there was a significant positive relationship between yield and total dry matter accumulation, hy-brid rice had apparent advantage for dry matter accumulation after heading, high yielding conventional japonica rice varieties accumu-lated more dry matter compared with hybrid rice before heading. Sufficient water and fertilizer could promote the remobilization of dry matter, which was useful to increase grain yield. The exportation of dry matter would be restrained if fertilizer and water were absent. Leaf had higher dry matter exportation rate than culm and sheath did. So erect panicle rice variety had great dry matter exportation a-bility of leaf, culm and sheath, which was effective to increase grain yield.