江苏现用主要粳稻品种对氮素的反应

在大田和盆栽试验条件下 ,研究杂交籼稻汕优 63和 4个中粳品种武育粳 3号、951 6、952 2及镇稻 88对氮肥施用期的反应。结果表明 :基肥、分蘖肥和穗肥 3种施肥方法的增产作用及肥料的利用率 ,汕优 63以分蘖肥为最大 ,武育粳 3号以穗肥为最大 ,而 952 2则在 3种施肥方法中差异不大。在等量氮肥作促花肥、保花肥和粒肥的 3种不同施肥时期中 ,氮肥的增产作用及肥料的利用率 ,汕优 63以粒肥为最大 ,促花肥为最小 ;武育粳 3号和 951 6以促花肥为最大 ,粒肥为最小 ;952 2和镇稻 88等则以保花肥最大。并对不同品种对氮肥施用期反应的差异进行了讨论。

RESPONSES OF THE MAIN MID-SEASON JAPONICA RICE CULTIVARS CURRENTLY CULTIVATED IN JIANGSU TO NITROEN APPLICATIONS

The responses of Indica hybrid rice Shanyou 63 and four mid season Japonica cultivars of Wuyujing 3, 9516, 9522 and Zhendao 88 to the nitrogen applying stages were studied under the paddy and pot cultivation. The largest contribution to increasing grain yield and the highest nitrogen utilized efficiency (N UE) came from the basic fertilizer for Shanyou 63, and from the panicle fertilizer for Wuyujing 3, and no significant difference for 9522, among the three N applications of the basic, tillering and panicle fertilizers. However, the largest contribution to increasing grain yield and the highest N UE were attributed to grain fertilizer for Shanyou 63, to spikelet promoting fertilizer for Wuyujing 3 and 9516, and to spikelet protecting fertilizer for 9522 and Zhendao 88, among the three N application stages of the spikelet promoting, spikelet protecting and grain fertilizers. The differences in responses of different cultivars to N application stages were discussed in the paper.