有机肥基肥基础上一次性追肥对稻米产量及品质的影响

Effect to one-time additional fertilizer on rice yield and quality under basal organic fertilizer

以“苏香粳2号”为材料，在15kg/667m^2纯氮施肥水平下，以50％N采用有机肥基施、50％作追肥在6个不同叶龄余数下分别施入的运筹方式，研究不同时期追施N对中晚粳稻米品质及产量的影响。结果表明：在倒3叶追N时产量最高，倒2、4叶次之，而整精米率以倒4叶施N为最高，垩白率以倒2、3叶处理最低，RVA特征谱以倒1、2叶追肥处理最优。为实现该品种稻米产量与品质协同提高，有机肥基施基础上一次性追肥，应选择在叶龄余数为2～3叶时施用。

The keng rice variety ＂Suxiangjing 2＂ was used as a test material, and in experiment the amount of applied fertilizer was 15 kg/667 m^2 pure nitrogen, in which 50% was organic fertilizer used as basal fertilizer and 50% was used as additional fertilizer that was applied at different stages of leaf age remainder. The experimental results showed that when leaf age remainder was 3, applying additional fertilizer could get the highest rice yield, and when leaf age remainder was 2 or 4, the yield came second. When leaf age remainder was 4, applying additional fertilizer could gain the highest head milled rice rate. Applying additional fertilizer at the stage of leaf age remainder 2 or 3 could get the lowest chalky rice rate, and the application at the stage of leaf age remainder 1 or 2 could get the optimal rice RVA characteristic values. In order to realize the coordinated improvement of the yield and quality of the rice variety, the time of one-time additional fertilizer application should be at the stage of leaf age remainder 2 or 3.