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采用盆栽土培和群体水培法研究水稻不同叶龄期上、下层根对缺水和高、低浓度培养液的反应及根量与产量的关系.供试品种为盐粳2号.结果表明:(1)上层根在原基分化期需较充足的水分和较高的养分供应水平;发根中、后期需充足的水分和低的养分供应水平;分枝中、后期需较高的养分供应水平。对短期缺水反应较迟钝.(2)下层根在分枝中,后期对养分反应较迟钝。叶龄余数4.7至抽穗后15天左右提高或降低培养液浓度,对下层根重的影响均不明显;分枝中期对缺水反应较敏感,叶龄余数1.1至抽穗前3天缺水使下层根重减轻27.1％,分枝后期则较迟钝.(3)上层根量与产量呈极显著正相关,下层根量与产量的关系随着栽培条件的不同而改变.
The pot culture and population hydroponics were used to study the response of upper and lower roots of rice at different leaf ages to water deficit and high and low concentration of culture broth and the relationship between root yield and yield.The test variety was Yanjing No. 2. The results showed that : (1) The upper roots need more water and higher nutrient supply in the primordium differentiation period; the middle and late roots need adequate water supply and low nutrient supply; the middle and late branches need higher nutrient supply Level. Short-term water shortage response more sluggish. (2) The lower roots in the branches, the late reaction to nutrients more sluggish. Leaves remaining 4.7 to 15 days after heading to raise or lower the concentration of culture medium, the impact on the lower root weight are not obvious; mid-branching reaction is more sensitive to water deficit leaf age 1.1 to 3 days before heading to the lower water layer The root weight was reduced by 27.1% and the late branch was more dull. (3) There was a significant positive correlation between the upper root yield and the yield, and the relationship between the lower root yield and the yield changed with different cultivation conditions.