田间低钾对不同穗型水稻钾的吸收和利用效率的影响

Influences of Low Potash on K Absorption and Use Efficiency of Different Panicle Rice Variety

选用典型直立穗型水稻品种沈农265和半直立穗型品种辽粳294为试材,研究两品种干物质积累、钾素吸收和利用效率的差异。结果表明:田间低钾条件两品种的产量和生物量都减少,其中半直立穗型品种辽粳294减少的较多。分蘖-抽穗期是两品种钾素积累高峰期,积累钾量达到全生育期积累量的2/3左右,抽穗前半直立穗型品种辽粳294积累的多,抽穗后相反,表明直立穗型品种沈农265生育后期吸收养分数量多,根系活力强。直立穗型品种钾效率高,耐低钾能力强,耐低钾能力达到一级指标。

The typical erect panicle rice variety Shennong 265, and semi-erect panicle rice variety Liaojing 294 were used to compare dry matter accumulation, absorption and use efficiency of potassium. The results showed that the grain yield and biomass of two varieties similarly decreased under low potassium condition; however the decrease of Liaojing 294 was more than that of Shennong 265. The summit of potassium accumulation of two varieties was from tiller stage to heading stage, and up to 2/3 of total potassium accumulation of whole growth period. Liaojing 294 accumulated more potassium before heading than after heading and Shennong 265 was contray . This showed that the erect panicle rice variety had more vigorous root, absorbed more nutrient, beared low potassium, and had higher efficiency of potassium utilization.