题目内容

The fertility characteristics of clayey soils can be described as ( ).

A. Fertilizer efficiency is high; nutrients can be available for plants in a long time;
B. Fertilizer efficiency is low; nutrients can only be available for plants in a short time;
C. Fertilizer efficiency is high; nutrients can only be available for plants in a short time;
D. Fertilizer efficiency is low; nutrients can be available for plants in a long time;

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Mechanical composition refers to the percentages of soil particles in different size classes.

Filed irrigation can promote the formation of good structures.

Timely and rational tillage, and compaction can break up large lumps and crust through the effects of cutting-up and squeezing, which is beneficial for promoting the formation of structure.

It is easy to form blocky structure in surface soil with high organic matter and light texture (lighter than medium loam).