M. Klepeckas, I. Januškaitienė, I. Vagusevičienė, R. Juknys
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引用次数: 5
摘要
本研究旨在确定冬小麦(Triticum aestivum L.)的最佳播期，并利用DSSAT Nwheat模型分析修改播期对物候发育和籽粒产量的影响。小麦在立陶宛的两个地点种植了三个季节，从9月1日至9月29日每周播种一次。播期推迟后，植被期三年平均气温每周降低0.16℃，有效GDD每周降低94.5℃。模型结果表明，每推迟播种一周，冬小麦分蘖率受播种时间的影响减少232(分蘖m-2)。每延迟播种一周，灌浆期缩短1.25 d。根据播种时间的不同，产量在8.58 ~ 6 t hm -1之间变化，而模拟收成则低8%。我们得出结论，在立陶宛当前气候条件下，最佳的冬小麦播种时间是9月中旬，DSSAT模型被证明是在面临气候变化引起的问题时预测播种时间的有用工具。
Effects of different sowing time to phenology and yield of winter wheat
This study aims to determine optimal sowing date for winter wheat (Triticum aestivum L.) and invoke DSSAT Nwheat model to analyze impact of modified sowing date to phenological development and grain yield. Wheat was grown for three seasons in two locations across Lithuania and sowing was carried out one time per week from 1 September to 29 September. Average three-year temperature of vegetation period gets lower every week by 0.16 °C, and available GDD by 94.5 °C when sowing time is delayed. Modeling results showed that tillering rate is affected by sowing time winter wheat grew 232 (tillers m-2) less with each week of delayed sowing. Grain filling stage was shortened by 1.25 days with each delayed sowing week. Depending on sowing time yield varied from 8.58 t ha-1 to 6 t ha-1 while simulated harvest was 8% lower. We conclude that best winter wheat sowing time for current climatic conditions in Lithuania is mid-September and DSSAT model proves as a useful tool in anticipating sowing time while facing problems caused by a climate change.
期刊介绍：
Agricultural and Food Science (AFSci) publishes original research reports on agriculture and food research related to primary production and which have a northern dimension. The fields within the scope of the journal include agricultural economics, agricultural engineering, animal science, environmental science, horticulture, plant and soil science and primary production-related food science. Papers covering both basic and applied research are welcome.
AFSci is published by the Scientific Agricultural Society of Finland. AFSci, former The Journal of the Scientific Agricultural Society of Finland, has been published regularly since 1928. Alongside the printed version, online publishing began in 2000. Since the year 2010 Agricultural and Food Science has only been available online as an Open Access journal, provided to the user free of charge. Full texts are available online from 1945 on.
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