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首页> 外文期刊>Crop and Pasture Science >Alternative methods of estimating water deficit stress of wheat grown on undisturbed and repacked soil in drainage lysimeters
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Alternative methods of estimating water deficit stress of wheat grown on undisturbed and repacked soil in drainage lysimeters

机译：在排水量测定仪中估算未扰动和重新装填的土壤上生长的小麦水分亏缺胁迫的替代方法

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The effect of soil modification on changing the availability of water and the onset of crop water deficit stress in wheat was assessed during 2 drying periods. The different methods of determining the onset of stress generally agreed with each other. Differences were either related to the different parts of the canopy measured or to different physiological processes measured. Because foliage temp. was continuously monitored, the dynamic development of stress in relation to increasing soil water deficit and root growth became evident. The allowable soil water deficit at the onset of stress varied widely between soil treatments and the stage of crop growth at which deficit stress occurred. Physically modifying the soil increased plant available water by 80%. This resulted from both changes in amount of soil water stored and through a more uniformly distributed root system. Wheat growing in undisturbed soil was unable to adapt to post-anthesis stress, as frequent irrigations prior to anthesis concentrated root distribution in the upper layers.
机译：在两个干燥期中，评估了土壤改良对改变水分供应和小麦水分亏缺胁迫的影响。确定压力发作的不同方法通常彼此一致。差异与测量的冠层的不同部分或测量的不同生理过程有关。因为叶子温度高。通过连续监测，与土壤水分亏缺和根系生长相关的应力动态变化变得明显。胁迫开始时土壤允许的水分亏缺在土壤处理和出现亏缺胁迫的作物生长阶段之间变化很大。物理改良土壤可使植物可用水增加80％。这是由于土壤蓄水量的变化以及通过更均匀分布的根系造成的。在未受干扰的土壤中生长的小麦无法适应开花后的胁迫，因为在开花前的频繁灌溉使上层根系分布集中。

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    《Crop and Pasture Science》 |1990年第2期|p.267-276|共10页
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