氮肥施用对优质晚粳稻浙禾香2号产量和品质的影响

通过不同基蘖肥及穗肥施用量试验,研究在高产、品质及高产品质均衡条件下浙禾香2号的叶片含氮量、籽粒外观品质、营养品质及产量表现。结果表明,浙禾香2号倒4叶叶片含氮量随着基蘖肥用量提高而提高,倒1叶叶片含氮量随穗肥用量变化而变化;同样施氮量,穗肥用量对叶片含氮量影响更大;基蘖肥低氮条件下,不同处理营养品质及外观品质没有显著性差异,基蘖肥纯氮0.12 t/hm²以上,减施穗肥可以降低垩白粒率和蛋白质含量,提高直链淀粉含量;氮肥（纯N）0~0.24 t/hm²范围内,产量随施肥量的增加而提高,穗肥的施用对产量的影响较大,但减施穗肥能明显提高食味值。综合考虑品质与产量,浙禾香2号穗肥施用量以0.045 t/hm²为宜。

Effects of Nitrogen Fertilizer on Yield and Quality of Zhehexiang 2

The leaf nitrogen content, grain appearance quality, nutritional quality and yield performance of Zhehexiang 2 were studied under the condition of different basal tiller fertilizer and panicle fertilizer. The results showed that, the nitrogen content in the 4th inverted leaf increased with the application of basal tiller fertilizer, and the nitrogen content in the 1st inverted leaf changed with the application of panicle fertilizer; under the same nitrogen application, the panicle fertilizer had a greater impact on the leaf nitrogen content. Under the condition of basal tiller fertilizer with low nitrogen, there was no significant difference in the nutritional quality and appearance quality of different treatments. When basal tiller fertilizer （pure nitrogen） was above 0.120 t/hm², reducing panicle fertilizer could decrease chalky rice rate and protein content, and increase amylose content. Within the range of 0~0.24 t/hm² of nitrogen fertilizer （pure nitrogen）, the yield was increased with the increase of nitrogen application rate, and the application of panicle fertilizer has a great influence on yield. However, reducing the application of panicle fertilizer could significantly increase the taste value. Considering the quality and yield, it is appropriate to apply 0.045 t/hm² panicle fertilizer for Zhehexiang 2.