不同粳稻品种源库关系的研究 Ⅱ.不同栽培条件下品种源库关系的变化

在田间试验条件下,研究了秀杂等品种(组合)在不同栽培条件下源库类型的变化,结果表明:当施氮量,插秧方式,每穴插秧苗数差异大时,品种的源库类型会发生改变。其中施氮量对品种源库类型转变的影响较大。不论中等肥力时品种的源库类型如何,低肥下一般多呈源库互作型,而在高肥条件下又转变为增源增产型。每穴插秧苗数对品种源库关系的影响和肥力相似,插秧苗数过少时相当于低肥,过多时则和高肥相近。插秧方式对品种源库类型转变的影响因品种而异。本文还对不同栽培条件下品种源库关系转变的原因进行了分析。

STUDY ON THE RELATIONSHIP BETWEEN SOURCE AND SINK IN DIFFERENT JAPONICA RICE VARIETIES Ⅱ. A CHANGE OF THE RELATIONSHIP IN DIFFERENT CONDITION

In field experiment the changes of classification of source and sink were studied with rice, Xiu Za and other varieties (combination)under different cultivation condition.The results showed that the classification of varietiesfor source and sink changedwhennitrogen supplies, the ways of seedling transplant and the numbers of transplantedseedlings. per pit differed, of which nitrogen supply affeeted the changes greatly. No matter what a classification of source and sink of varieties in intermediate level of fertilities was, most varieties appeared the source-sink—harmonic type when grown in the condition of low fertilities, and tended to be the source-limited type in the high fertile condition. The influence of transplantedseedlings per pit on the change of source and sink were similar to fertility effeet. When the numbers of the transplanted seedlings were less it was equal to low fertilities and when theywereexcessive, similar to high fertilities. The effects of the way of transplant seedlings were different to changeof classification between sourceandsinkof varieties. In this paper. The reasons for the changed relation between source and sink of varieties in different condition were also discussed.