A few questions about the soil in the second year of junior high school, the second volume of scienc

Soil fertility is the basic attribute and essential characteristic of soil, the ability of soil to coordinate nutrients, water, air and heat for plant growth, and the comprehensive reaction of soil physical, chemical and biological properties. The organic matter in the soil can be continuously and effectively decomposed into various minerals under the action of soil microorganisms and various physical bodies. As for what you said, earthworm loosening soil can enhance soil fertility is not wrong, but the real process is that earthworm loosening soil makes air and water participate in various chemical reactions of the soil, and the most important chemical reaction is the decomposition of organic matter into nutrients, from which it can also be seen how much organic matter affects soil fertility.

Mineral granular stone refers to the particle size of the soil, which is roughly divided into three types: clay, loam, and sand, but what is the direct relationship between the size of this fertility and the size of fertility.

As for question 2, the soil of Heilongjiang is loam, which is also from the soil quality, that is, the mechanical composition of the soil, refers to the relative proportion of the content of soil particles at all levels in the soil and the soil sand and clay properties it expresses, although the silt of the riverbed has a high content of various soil nutrient indicators, but due to the nature of clay itself, it is easy to harden and cause soil nutrients can not be continuously and effectively absorbed by plants, so in agricultural production, silt will generally be mixed with other soils before planting. Loam soil is not low in nutrients due to its various soil nutrient content, and because it can carry out various chemical and physical reactions in the soil, nutrients can be absorbed continuously and effectively.

The creature of junior high school is really.。。 I'm a senior in high school.

As far as my current knowledge of soil fertility mainly refers to whether the mineral elements are complete, and the loose soil should be said to improve the ability of plants to absorb minerals, because the loose soil allows the roots of plants to contact sufficient oxygen for aerobic respiration to strengthen the absorption of mineral elements; In addition, the abundance of oxygen is conducive to the biological nitrogen fixation of rhizobia, but it seems to have little to do with the size of the particles, so it should be a pair.

The second one really doesn't know, sorry.

The size of the mineral particles cannot be changed by loosening the soil.

Fertility is the amount of organic matter, this is a matter of common sense, just remember the answer.

The soil in Heilongjiang is suitable for the growth of crops and should be loam.

The second is loam.

It has good aeration, permeability, water retention and thermal insulation performance, and is an ideal agricultural soil.

Loam soil is an ideal soil for the cultivation of medicinal plants, suitable for planting a variety of plants, and plants with roots and rhizomes are more suitable for cultivation in loam.

1 is a. Because soil organic matter is the main source of plant nutrients, it has a great impact on soil fertility because it has the ability to promote the growth and development of crops, improve soil structure, improve soil water and fertilizer retention capacity, and promote the activities of soil microorganisms.

2 is loam. The black soil of Heilongjiang is very rich in organic matter and humus, and the soil structure is good, so it cannot be clay.

Soil organisms: plants, animals, microorganisms.

Abiotic: air, water, humus, minerals.

Water, air, inorganic salts soluble in water, microorganisms, minerals, animals (earthworms).