Characteristics of high yielding fertile soils What is the most fertile soil

Generally high-yielding fertile soils with the following characteristics:

1) Good soil structure (soil structure refers to the vertical structure of the upper and lower soil layers of the soil within a depth of 1 meter, which includes the combination of soil thickness, texture and layer. ）

Highly fertile dryland soils generally have a solid soil structure, that is, the tillage layer is loose and deep (generally about 30 cm), and the texture is light; The core soil layer is compact, and the texture is more sticky. It is not only conducive to aeration, water permeability, warming, and nutrient decomposition, but also conducive to water and fertilizer retention. The upper and lower soil layers are closely coordinated, so that the whole soil becomes a good configuration that can coordinate the water, fertilizer, gas, heat and other conditions required for high yield of crops.

Paddy soil with high fertility generally has a soft and fertile tillage layer (the thickness is generally about 18 cm), a well-developed plough bottom layer (about 10 cm thick) that is both stagnant and permeable, a markings layer with good aeration and permeability (core soil layer, storage layer), and a subsoil layer with deep burial and strong water retention (also called alluvial layer or green mud layer). Each layer is interdependent and coordinated with each other, which is not only conducive to nutrient release and efficiency, but also can promote the activity of the root system, and the fertilizer effect is stable and long, easy to adjust and manage, so as to obtain the effect of high yield and stable yield.

2) Moderate coordination of soil nutrients.

The nutrient content of fertile soil is not about the more the better, but about the right amount of harmony to reach a certain level. In the high-yield dryland soils in the north, the organic matter content is generally more than 15 20 g kg, the total nitrogen content is 1 g kg, the available phosphorus (P) content is more than 10 mg kg, the available potassium content is more than 150 200 mg kg, and the cation exchange capacity is more than 20 molar kg.

The appropriate amount of organic matter content in fertile paddy soil is 20 40 g kg, total nitrogen is g kg, total phosphorus and total potassium are more than 1 15 g kg, respectively, and cation exchange is generally 10 25 molar kg.

3) Good physical properties.

Fertile soils generally have good physical properties, such as moderate texture, good tillage, more water-stable aggregates, large and small porous ratios of 1 (2 4), and soil bulk density gram 3

50% or slightly more than 50% total soil porosity. Among them, the ventilation porosity is generally more than 10%, so there is a good water, gas and heat condition. In addition, fertile paddy soils must have a moderate seepage nature.

Generally, the fertile paddy soil is mostly cool paddy field, and the daily leakage is 9 15 mm, and the leakage amount of the leaky paddy field is too large, and the water leakage and fertilizer leakage. The leakage of the capsule paddy field is very poor, with more water and less air, and the growth of rice is often inhibited due to the accumulation of too many toxic substances.

According to the above indicators, a comprehensive analysis was carried out to judge the level of soil fertility.

It mainly depends on the amount of organic matter, and generally speaking, the black soil is more fertile.

The most fertile soil is the Northeast Black Soil.

Northeast black soil, is currently one of the three pieces of black soil in the world only remaining skin type locust, black soil is in the cold climate conditions, the surface vegetation dies and burns friends after a long period of erosion after the formation of humus after the evolution of the formation, with its high organic matter content, fertile soil, loose soil, the most suitable for cultivation is famous in the world, known as the grain warehouse, because it takes 400 years to accumulate the black soil layer of 1 cm thick by renting the key, so the humus and organic matter content in the soil layer is extremely rich.

The most fertile soil is the Northeast Black Soil.

Northeast black soil, is one of the only three remaining black soil in the world, black soil is in the cold climate conditions, the surface vegetation dies after a long period of erosion after the formation of humus after the evolution of formation, with its high organic matter content, fertile soil, loose soil, the most suitable for cultivation is famous in the world, known as the grain storehouse, because the formation of 1 cm thick black soil layer takes 400 years of accumulation, so the soil layer humus and organic matter content is extremely rich.

The most fertile soil is the Northeast Black Soil.

Northeast black soil, is one of the only three remaining black soil in the world, black soil is in the cold climate conditions, the surface vegetation dies after a long period of erosion after the formation of humus after the evolution of formation, with its high organic matter content, fertile soil, loose soil, the most suitable for cultivation is famous in the world, known as the grain storehouse, because the formation of 1 cm thick black soil layer takes 400 years of accumulation, so the soil layer humus and organic matter content is extremely rich.