江淮下游不同播期对稻–麦周年作物产量、品质及温光资源利用的影响

对江淮下游稻麦两熟高产优质种植模式周年气候资源分配和利用特征的探究,可以为当地机插水稻–小麦周年产量和气候资源利用效率的提高提供一定的理论依据。在泰州兴化市,水稻季以迟熟中粳南粳9108和中熟中粳连粳11为材料,设置5月22日(R-Ⅰ)、5月29日(R-Ⅱ)和6月5日(R-Ⅲ) 3个播期,小麦季以冬小麦宁麦13为材料,设置11月5日(W-Ⅰ)、11月15日(W-Ⅱ)和11月25日(W-Ⅲ) 3个播期,分析了不同播期下机插水稻–小麦周年高产优质形成与稻季、麦季资源分配特征。结果表明,水稻季,随着播期推迟,迟熟中粳南粳9108产量、温光资源量及其生产效率均显著下降,中熟中粳连粳11温光资源量呈下降趋势,但产量及温光利用率呈先升后降趋势,各播期迟熟中粳产量均高于中熟中粳。小麦季,产量、温光资源量及其生产效率均随播期推迟有不同程度降低。从周年生产看,周年稻麦产量随两季作物播期的推迟显著降低,其中迟熟中粳南粳9108播期R-Ⅰ与小麦播期W-Ⅰ组合在所有处理中产量最高。水稻产量占周年产量比例最高为62.99%,最低为55.86%。两季间积温分配率水稻季最高为68.38%,小麦季最高为34.14%。...

Effects of different sowing dates on crop yield,quality, and annual light-temperature resources utilization for rice-wheat double cropping system in the lower reaches of the Yangtze-Huaihe Rivers valley

Clarifying the characteristics of the annual light-temperature resources distribution and use efficiency for mechanical transplanted rice-winter wheat double cropping system with high yield and high quality is essential for increasing annual yield and climatic resources use efficiency in the lower reaches of Yangtze-Huaihe Rivers valley. Nanjing 9108 (late-ripen medium japonica rice, LRMJ), Lianjing 11 (medium-ripen medium japonica rice, MRMJ) and Ningmai 13 (winter wheat) were used in the annual field experiment with three different rice sowing date (May 22 (R-I), May 29 (R-II) and June 5 (R-III)) treatments and three different wheat sowing date (November 5 (W-I), November 15 (W-II) and November 25 (W-III)) treatments at Xinghua county of Taizhou city in Jiangsu province. The character of yield, quality formation, annual accumulated temperature, and solar radiation resources distribution were investigated. The results showed that, in rice season, the yield, the amount and production efficiency of the light-temperature resources decreased significantly in Nanjing 9108 with sowing date delayed, whereas the yield and the utilization efficiency of light-temperature resources first reached maximum in R-II treatment and then declined, and the amount of light-temperature resource decreased in Lianjing11. In all sowing date treatments, the yield of Nanjing 9108 (LRMJ) was higher than that of Lianjing 11 (MRMJ). In wheat season, with sowing date delayed, the yield, the amount and production efficiency of light-temperature resources of Ningmai 13 decreased to some extent with the delay of sowing dates. From the perspective of annual production, the annual yield of rice-wheat decreased significantly with the delay of rice-wheat sowing date, and was the highest with combination of R-I for Nanjing 9108 and W-I for Ningmai 13 among all the treatments. The highest ratio of rice yield to annual yield was 62.99%, and the lowest was 55.86%. The highest distribution rate of annual accumulated temperature was 68.38% in rice season and 34.14% in wheat season. The average distribution rate of annual radiation was 51.7% in rice season and 48.3% in wheat season. The downward trend was found in production efficiency of annual accumulated temperature and radiation with the delay of sowing date in rice-wheat season, and the later the sowing date, the more significant the reduction. In terms of quality, with sowing date delayed, the milling quality of Nanjing 9108 (LRMJ) became better and the appearance quality became worse, however, the milling quality of Lianjing11 (MRMJ) became worse and the appearance quality became better. In addition, the cooking and eating quality and nutritional quality of the two varieties (except the taste value of Lianjing 11) became worse. Furthermore, wet gluten content and protein content of Ningmai 13 decreased significantly with sowing date delayed. Therefore, it is an effective approach for promoting the sustainable productivity of mechanical transplanted rice-winter wheat double cropping system by optimizing sowing date and selecting rice varieties with suitable growth durations to achieve high production efficiency of light-temperature resources and annual crop yield in the lower reaches of Yangtze-Huaihe Rivers valley.