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1.(4)Contrary to the quantity, the root activity (TTC reducing capacity) was lower in the top soil layers and higher in deep layers, which shaped like a "T" . With the growth stages advance, the root activity decreased, and the highest root activity point on vertical soil moved deeper, i.e., the highest points of jointing, male tetrad, flowing and milk grain & ripe stage occurred in 20 - 40 cm, below 40 cm, and below 80 cm soil layer, respectively.
④根系活性与根量相反呈倒“T”型分布,根系活性随生育进程推进,呈减低趋势,且活力高位点又呈下移变化,拔节期20～40cm根系活性较高,大口期40cm以下较高,乳熟期和成熟期以80cm以下较高。收藏指正
2.a sharp steel wedge that cuts loose the top layer of soil.
能够使土的顶层松软的锋利钢楔。收藏指正
3.the top layer of a soil profile; usually contains humus.
土壤层中的顶层；通常含有腐殖土。收藏指正
4.The farmers ploughed the vegetable leaves back to enrich the soil.
农夫们把蔬菜叶犁入土中作肥料。收藏指正
5.The farmer ploughed the loose leaves under to enrich the soil.
农夫将散落的叶子埋人土中，使土地更肥沃。收藏指正
6.A part or layer that forms the top.
构成顶部的部分或一层收藏指正
7.The remains of the crop should be ploughed under to enrich the fertility d the soil.
庄稼的秸棵应埋入土中，增加肥力。收藏指正
8.The effect of dry-saturated layer on the heat and mass transfer in soil is also analyzed. The numerical simulations show that: Starting from the occurrence of dry soil layer (DSL), water evaporation front moves from soil top surface to the interface between unsaturated layer and dry layer.
数值模拟的结果显示:出现干饱和土壤层后,水分蒸发锋面从土壤表面下移至干饱和层与非饱和土壤层界面处,水分蒸发强度明显降低,土壤温度显著升高,干饱和层厚度增长缓慢。收藏指正
9.Farmers enrich the soil with organic and inorganic manures.
农民用有机肥料和无机肥料来提高土壤的肥力。收藏指正
10.After the wheat crop has been gathered, many farmers burn the remains and plough the ash into the soil, so as to enrich the soil.
割完小麦后, 许多农夫把麦秸烧掉, 并把灰烬埋入土中, 以增加土壤肥力。收藏指正
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