关键词: 两优6326, 再生稻, 留茬高度, 产量

Abstract:

In order to explore the high yield cultivation techniques of ratoon rice, a field test was carried out to study the effects of stubble height on ratoon rice with ten different stubble heights, using Liangyou 6326 as material in Xinyang, Henan. The results showed that the growth period was decreased firstly and then increased, the number of grain per panicle, seed setting rate and 1 000-grain weight were decreased, but the total panicle number was increased with the increase of stubble height. When stubble height was 45 cm, 50 cm and 40 cm, the growth period was relatively shorter. When stubble height was under 25 cm, the main contribution to ratoon rice yield were nodes below 4th from top; when stubble height between 30 and 40 cm, the main contribution to ratoon rice yield were 3th and 4th nodes from top; when stubble height above 45 cm, the main contribution to ratoon rice yield were 2th and 3th nodes from top. When stubble height was 45 cm, Liangyou 6326 had shortest growth period and highest yield, the contribution rate of 2th and 3th nodes from top was 70.57%. The cultivation techniques of ratoon rice of South Henan province could be referred to Liangyou 6326, which retain 2th to 4th nodes from top and make full use of it.

Key words: Liangyou 6326, ratoon rice, stubble height, yield