In 1984-1985, the root activities with leaf-age-progress was investigated in different rice varieties cultivated in nutrient solution and in field.

1985年，研究了群体水培和大田栽培条件下水稻不同类型品种根系活力的叶龄进程。

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By using pot tests, the effect of low-P stress on dark sun-cured tobacco endogenous hormone and root activities were studied during different growth stage.

通过盆栽试验和室内分析，研究低磷胁迫对晒红烟内源激素和根系活力的影响。

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The results indicated that root-divided alternative irrigation could increase root activities, photosynthesis rate and water use efficiency of tobacco leaf, but decrease transpiration rate;

结果表明，分根交替灌溉可增强烟株的根系活力，保持较高的光合速率，降低蒸腾速率，提高叶片瞬时水分利用效率；

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Alongside relevant international conferences to raise awareness, UNESCO strives to promote grass-root activities, particularly in sensitive geo-strategical areas that reach target-populations such as women, youth and marginalized populations.

UNESCO: CULTURE

In an area of a few tens of square kilometres around this tower, the researchers will place further sensors in the soil and in local streams, to measure temperature, carbon-dioxide and nutrient levels, along with rates of root growth and the activities of microbes.

ECONOMIST: A 30-year plan to study America��s ecology is about to begin