补灌对陇南北部冬小麦产量和耗水量及水分利用效率的研究

Study on the Yield and WUE and ET under Supplementary Irrigation Condition in North Longnan of Gansu

在陇南北部半干旱区清水试验站,在有限补灌条件下,对冬小麦产量及水分效应进行了研究,以期得到补灌时期的最佳结合点。结果表明:在补灌条件下,采用地面滴灌技术对冬小麦进行补灌的最佳时期是在"拔节期+孕穗期";最佳补灌量是播前土壤补灌9mm,拔节期、孕穗期分别补灌40.5mm;分次补灌效应优于一次性集中补灌,补灌可有效地提高水分利用效率(WUE);适时适量补灌效应的研究,表明了补灌的必要性、重要性、迫切性,也可为半干旱区水分高效利用提供一定的理论依据。

The experiment has been conducted at Qinshui station in North Longnan of Gansu. Under limited supplementary irrigation,we studied on the yield, ET and WUE in order to make clear the best group of irrigation and growth stage.The results showed that the best stage to supply was at Jointing and Booting under the dropping irrigation ; the best irrigating time and water was 9mm before sowing and 40.5mm at Jointing and Booting respectively. The effect of many-time irrigation was better than one time. The yields, ET and WUE under supplementary irrigation were all higher than these of CK. So, the supplementary irrigation was very important for winter wheat at semi-dried areas.