【摘要】 分析了冀西北坝上高原莜麦生育期间降水特点和旱地土壤水分周年变化规律,在旱棚控水条件下,研究了莜麦需水规律。结果表明,本区6月中旬是稳定干旱期;40cm以下土壤水分作物利用不充分;拔节到孕穗期是莜麦水分敏感期和高速耗水期。本文提出了促根下扎深层摄水和调整播期使需水敏感期与稳定干旱期错位、高速耗水期与雨季重合是提高莜麦产量的技术关键。更多还原

【Abstract】 This paper analyzed the law of precipitation and dryland soil moisture change and studied the regularity of water requirement of the naked oats under controlling water condition in Bashang, the northwest plateau of Hebei. Results showed that the second ten days in June was the stable drought stage and the soil water content under 40cm horizon was not enoughly used by the crop. It were also showed that the stage from elongation to booting was the most sencitive period to water stress and was the time when water consumption of the naked oats was the fast. It was advanced that promoting the root growth deeper to absorp water from deeper soil horizon and to meet the needs of waterfast comsumed by the crop and adjusting the sowing time in order that the sencitire stage of the naked oats to water stress could miss the stable drought period and the fast water consumption stage could meet the rainy season were the key way to increase the naked oats yield in the dryland soil of this region.更多还原