cultivated horizon

Investigating and analysing natural and economic conditions of Kenli County, the content of organic matter, configuration of soil body, underground water table and salinity of cultivated horizon were used as the identification factors, and the evaluation criteria of land natural productivity were formulated.

本文通过对垦利县土地自然及经济情况的调查分析，选择有机质、土体构型、地下水埋深及土壤耕层含盐量为参评因素，制订了垦利县土地自然生产力评级标准；

The cultivated horizon was too shallow and machinery cultivation can increase thickness of cultivated horizon effectively.

耕层土壤厚度过浅，机耕可有效增加耕层厚度；

There were more nematode cysts in soil where the content of phosphorus and potassium were naturally rich and where the water capacity was higher. Most nema-todes inhabited in 5-30 cm cultivated horizon.

CCN多居于自然含磷、钾元素多且保水性能好的油沙土中，以5～30cm的耕作层孢囊量较多。

The results showed that relationship between the weed and the soil moisture in cultivated horizon was obvious. The monocots whose relative abundance increased with the soil moisture are the most abundant in the seriously waterlogged area.

结果表明，该地区油菜田杂草的发生特点与耕作层土壤水分含量存在明显关系：对产量危害较大的禾本科杂草在重渍害区为优势种群，其相对多度随着土壤水分的增加而增高；

Soil samples of cultivated horizon from Gongpeng town were analyzed in1998 and the results were compared with that in1990.

1998年对黑土区（弓棚镇）的耕层土壤养分进行分析，并与1990年该区土壤的化验结果进行了比较。

Analysis of Effect and Reason of Increasing Yield of the Sowing of Total Cultivated Horizon on Winter Wheat

冬小麦全耕层播种增产效果及其原因分析

Spatial Variability of Soil Nitrogen in Cultivated Horizon and Its Application in a Site-specific Long-term Experimental Field

长期定位试验地耕层土壤氮素空间变异性及其应用