SU1561856A1 - Method of reclaimining season-frozen soil - Google Patents

Abstract

The invention relates to agriculture, in particular, to land reclamation activities in irrigated agriculture. The purpose of the invention is to increase the yield of agricultural crops by creating favorable water and thermal regimes of the soil. After harvesting and lifting from the groundwater, the groundwater is propped up and, at the beginning of winter, when the upper 3–5 cm layer of soil freezes to a temperature of (-5) - (-10) ° C, water is supplied to the soil surface and a layer is flooded, which after freezing destroys to lumpy state. The flooding layer is created with a capacity of 10–20 cm, and the ice that is formed is destroyed by cam mechanisms, which are moved across the field in mutually intersecting directions to achieve an effective diameter of lumps of ice 1–5 cm. In the spring, thawed water is released and the groundwater level is reduced. 2 hp f-ly, 1 tab.

Description

The invention relates to agriculture, in particular, to hydro-melioge- rative measures in irrigated agriculture, mainly in rice cultivation, and can be used in rice and other irrigation and drainage systems, as well as in rainfed agriculture in areas with adverse climatic conditions. mi

The purpose of the invention is to increase the yield of agricultural crops by creating favorable water and thermal regimes of the soil.

The method is carried out as follows.

In the autumn, after harvesting and lifting from the bi, groundwater is propped up, and

gates at the structures at the end of the cartova drainage and waste channels are closed so that the precipitations in the form of rain are not diverted into the drainage network. The groundwater level rises 80-100 cm or more, depending on the amount of precipitation.

At the beginning of winter, when the temperature of the soil is (-5) - (-10) ° C at a depth of 3-5 cm, water is applied to the surface and a layer of flooding is created — a depth of 10-20 cm with tightly closed water outlets from checks into the drainage system but e-mail channels. After the created layer of water freezes on the field, the formed ice is destroyed, for example, by trailed cam rollers.

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before the formation of a lumpy crushing size of 1-5 cm in a predetermined process procedure for 2-3 passes in cross-cross directions, the loose layer of ice protects the soil from deep freezing in winter.

Conducted special analytical and model studies. They showed that ice on the edge contributes to a significant decrease in the depth of soil freezing at negative temperatures and the duration of thawing at positive temperatures.

The effect of the ice edge layer on the freezing and thawing of the soil is given in the table.

In the spring, at stable positive air temperature, the valves on the water outlets from the checks into the drainage channels and at the end of the drainage channels open, gradually discharge the melt water from the drainage water and at the same time lower the groundwater level to a depth of 80-150 cm for surface and subsurface drainage, which facilitates the flow of a favorable redox regime in the soil, accumulating free and bound oxygen, vital for young rice plants, especially in the seedling phase — tillering.

The invention allows for the timely processing of spring soil cultivation and the sowing of agricultural crops.

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tour with full use of the warm vegetation period, which contributes to an increase in the yield of cultivated agricultural crops “

Claims (3)

1. The method of reclamation of seasonally permafrost soils, including the autumn subsidence of the groundwater level after harvest and the rise of the soil, as well as the spring discharge of melt water from the floor surface with a simultaneous decrease in the groundwater level to a certain level, characterized by , in order to increase the yield of agricultural crops by creating favorable water and heat regimes of the soil, when the topsoil freezes to a depth of 3-5 cm to a temperature of (-5) - (-10) C, water is applied to the soil surface and create a layer flooding, which, after freezing, is destroyed to a lumpy state 2. A method according to claim, characterized in that, in order to reduce the depth of soil freezing, a flood layer is created with a thickness of 10-20 cm, 3. A method according to claim 1, characterized in that the ice is destroyed by means of cam mechanisms, moved in mutually cross-directional directions, to create lumps of ice of 1-5 cm in size. five 0 r20 -20 25 13 120 43 ,50 32