不同栽培模式早稻-再生稻头季稻分蘖动态及生理生化特性研究

Effect of different cultivation patterns on tiller development and physio-biochemical characteristics of first ratoon rice crop

试验研究超高产栽培模式和常规栽培模式对再生稻头季稻分蘖动态及生理生化特性影响的结果表明，与常规栽培模式相比，头季生育期间，超高产栽培模式稻株的根系活力、叶绿素含量、叶面积指数、硝酸还原酶活性、硝态氮含量、Ca^2＋-ATPase和Mg^2＋-ATPase活性从分蘖期到成熟期分别高出20．60％～38．65％、5．16％～23．26％、18．91％～63．29％、18．22％～76．76％、34．88％～48．35％、1．25％～17．94％和4．09％～17．87％，有效分蘖期缩短5d，低节位分蘖多51．61％；不同生育期超高产栽培模式氮素累积量是常规栽培模式的1．43～2．44倍，磷素累积量是常规栽培模式的1．21～1．48倍，孕穗期后的钾素累积量是常规栽培模式的1．55—2．21倍，为优化群体质量，提高后期群体光合效率，实现高产奠定了基础。

The effect of different cultivation patterns, Super High-Yield Cultivation Pattern （SHCP） and Tradition Culitvation Pattern （TCP） , on tiller development and physio-hiochemical characteristics of first ratoon rice were studied. The result indicates that root activity, chlorophyll content, LAI, nitrate reductase activity, NO3^- - N content, Ca^2＋- ATPase activity and Mg^2＋- AT- Pase activity of the first rice crop under SHCP are respectively 20.60% -38.65% , 5.16% -23.26% , 18.91% - 63.29% , 18.22% - 76.76% , 34.88% -48.35% , 1.25% N 17.94% and 4.09% - 17.87% higher than TCP from tillering to ripening stage. Productive tillering period shortens by 5 d and lower node tillers increases by 51.61%. Accumulation of N and P at different growth stages and K during grain filling under SHCP are respectively 1.43 -2.44, 1.21 -1.48, 1,55 -2.21 times those of TCP. These traits can optimize population quality, improve the photosynthesis efficiency in later growth period, and lay the foundation for high yield attainment.