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以江苏淮北稻区稻麦两熟的单季稻为对象,研究了不同地力上的施氮量对超级稻产量及物质生产的影响,为不同地力土壤合理施氮肥提供依据。以该区有代表性的超级稻中熟中粳徐稻3号为供试材料,研究了麦茬田高、中、低3种地力水平上不同施氮量对水稻产量及其构成因素、以及对水稻群体质量的影响。结果表明:施氮量与水稻产量之间呈极显著的二次曲线关系(r高=0.959**,r中=0.971**,r低=0.981**),且高地力土壤水稻产量显著高于中地力土壤,中地力土壤的水稻产量显著高于低地力土壤;不同地力水平上的最高产处理在各个生育期都有相对应较好的群体质量,包括适宜的叶面积指数、合理的茎蘖动态、较高的群体颖花量及花后干物质的积累;在不同地力水平上出现的最高产量,其对应的适宜施氮量分别为260.3、290.7、345.8kg·hm-2。可为该区不同地力下超级稻制定高产适宜施氮量提供依据,3种施氮量在该稻区不同地力示范后分别获得高产,达到了节氮的效果。
The effects of different amount of N application on the yield and material production of super rice were studied using single cropping rice and double cropping rice in Huaibei rice field in Jiangsu Province as the research object. Taking the representative mid-maturing medium japonica rice variety Xudao No.3 in this area as test material, the effects of different nitrogen application rates on grain yield and its components at high, medium and low soil fertility levels were studied. The impact of group quality. The results showed that there was a significant quadratic curve (r height = 0.959 **, r = 0.971 **, r low = 0.981 **) between the amount of nitrogen application and rice yield, and the yield of paddy soil was significantly higher The yield of paddy soil in soil fertility soil and soil fertility soil was significantly higher than that in low-fertility soils. The highest yielding treatments at different soil fertility levels had corresponding good group quality in each growth period, including appropriate leaf area index, reasonable stem Tillering dynamics, spikelet population and post-anthesis dry matter accumulation. The highest nitrogen rates at different soil fertility levels were 260.3, 290.7 and 345.5 kg · hm-2, respectively. Which could provide the basis for formulating high-yielding suitable nitrogen application rate under super-high-yielding paddy in this area. The three nitrogen application rates were high-yielding respectively under the different fertility demonstration in this paddy area, and the nitrogen-saving effect was achieved.