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软盘旱育机插条件下,以杂交中粳徐优403为材料,研究了里下河地区稻麦两熟制不同施氮量对机插杂交稻徐优403产量和品质的影响。结果表明,随施氮量的增加,机插杂交稻徐优403的穗数和每穗颖花数和产量呈先增后减趋势,以N 225 kg/hm~2处理最高;结实率和千粒重表现为随施氮量增加而减小。施氮量主要影响稻米品质中的垩白度和垩白率,其次为消减值,而对其它品质指标影响较小。品质性状中的加工碾磨品质、稻米的表面积、横面积可与产量在一定程度上实现高产优质统一;而其它品质指标则表现为对施氮存在负响应。综合来看,机插杂交稻徐优403适宜施氮量以施N 225 kg/hm~2为宜。
The effects of different nitrogen application rates on the yield and quality of hybrid rice Xyou 403 with rice and wheat double cropping in the Lixiahe region were studied under the conditions of soft-tray drought-tolerant machine. The results showed that the spikelet number, spikelet number and yield per spike increased firstly and then decreased with the increase of N application rate, and reached the highest at N 225 kg / hm ~ 2. The seed setting rate and 1000-grain weight The performance decreases with the increase of nitrogen rate. The amount of nitrogen application mainly affected the chalkiness and chalky rate in rice quality, followed by the abatement value, but had little effect on other quality indexes. The quality of processing and milling in quality traits, rice surface area, cross-sectional area and yield can achieve high yield and quality unification to a certain extent; while other quality indexes show negative response to nitrogen application. Taken together, the optimum nitrogen application rate for hybrid rice Xuyou 403 was N 225 kg / hm ~ 2.