土壤保持

During tobaccos early to middle period, material accumulating appeared increasing with the increasing of phosphorus consumption.

低磷土壤中，在烟株生长早期和中期，烤烟体内磷浓度随磷用量的增加而增加，与干物质积累变化保持一致；但到末期，磷浓度呈下降趋势。

The best condition for grain development is to keep soil moisture at 70% of capillary water.

这一时期以保持土壤毛管持水量的70%左右对结实最为有利。

Third, water, soil, plant trees to be maintained, it is necessary to use tree planting to curb soil erosion, afforestation must be, because the trees are as large as the crown of the root system, like giant hands firmly grasp the general soil.

第三，植树使水土得到保持，就要利用植树来抑制水土流失，所以必须要植树造林，因为树木有像树冠那样庞大的根系，能像巨手一般牢牢抓住土壤。

Sandy soils contain at least 85% sand and not more than 10% clay. They are light and drain well. However, retention of nutrients and water is poor.

在沙质土壤中含有85%以上的沙和近10%的粘土，因此具有质量轻，排水优良的特点，但对于营养物质与水的保持力就较低。

The saving-water effect of Radish and Cabbage under PFM and appropriate irrigation,and the drought-resisting of radish seedling which seed was soaked by CaCl_2 were systematicly reseached by field observation and the experiment in door.The main results were summaried as follows:The soil temperature of 0~20cm cultivated layer was increased 3-4.5℃ in early growth period was only 1℃ in late growth period by PFM;there was more water saved up to 20.84mm in 0~60cm soil layer by PFM than no PFM in the early growth period of Radish;the yield and water use efficiency of Radish in L4 were exceeded respectively 10.1% and 21.9% of that contrast, the yield and water use efficiency of Cabbage in G4 were exceeded respectively 8.7% and 26.58% of that contrast, under PFM and appropriate irrigation.

主要研究结果如下：地膜覆盖在植株生长前期耕作层平均可增温3～4.5℃，在生长后期增温幅度减小，仅有1℃左右；地膜覆盖在植株生长前期可有效的保持土壤水分，在萝卜生长前期，使0～60cm土层内多储水20.84mm；在覆膜不灌水充分利用自然降雨的条件下生产萝卜，可比裸地正常灌水萝卜增产10.1%，水分利用效率提高21.9%；覆膜只浇一水生产甘蓝，可比裸地正常灌水生产甘蓝增产8.7%，水分利用效率提高26.58%。

It is indicated that even though there are different types of soil and their bedrocks, the distribution still keeps the similar model of the REE in bedrock.

结果表明：尽管土壤及其母质类型不同，但是其稀土元素分布还大体上保持母质中的分布模式特征。

You will be glad to have the earthworms in your garden, as they help to keep the earth soft and fertile.

你将高兴有蚯蚓在你的花园，因为它们有助于保持地球的软，肥沃的土壤。

The ecologicalcharacteristics of community structure, species diversity, its ecological effects on soil health,and eco-system functions of soil water holding capacities, water and soil conservation effectswere studied symmatically in Nverzhai watershed , which was the key experiment anddemonstration spot of the Yangtze River Proctction Fores.

针对长江中下游低山丘陵区土地退化现状和我国现阶段生态工程建设需求，以湘西北武陵山区女儿寨小流域为研究对象，研究了7种典型植被恢复模式的群落结构、生物量分配格局、物种多样性、土壤健康效应等生态学特征及水土保持、水源涵养等生态系统服务功能，具有重要的理论意义和应用价值。

The purpose of the plastic bag is to maintain very high humidity and to keep out fungus gnats. Fungus gnat larvae will eat the seedlings. A temperature between 20°C to 25°C (70°F to 80°F) works best.

使用夹鍊袋的目的是可以保持高湿度，并且防止蕈蚊(Fungus Gnats，长在潮湿的土壤中)，蕈蚊会吃幼苗。

With deep pots and non weighting lysimeters,different soil moisture stresses are developed and maintained during turn green to maturing stage in winter wheat.

采用深桶栽培结合测坑法，从冬小麦返青至蜡熟期保持不同的土壤水分，分生育期对小麦的形态、生理和根系进行了测定。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失