METHOD OF DEEP LOOSENING OF DRAINED SOILS Russian patent published in 2015 - IPC E02B11/00 A01B79/02 

FIELD: agriculture.

SUBSTANCE: invention relates to techniques of drainage of agricultural land of nonchernozem belt with closed drainage and the techniques of use of these lands. The method comprises loosening the drained soils to a depth of at least 60 m. In order to ensure the required by the plants of soil humidity conditions, preventing the possible damage to the pipes of closed drainage and providing industrial applicability of deep loosening, the deep loosening is carried out to a depth of h_l, determined in each case from the condition of compliance with the following requirements: (h_r)_min ≤ h_l ≤ (h_r)_max; (1), h_l ≤ (h_r)_min - D - ΣΔh_{i ,} (2), where ΣΔh_i = Δh₁ + Δh₂ + Δh₃ + Δh₄; (3), 60 ≤ h_l ≤ h_t , (4) where (h_r)_min and (h_r)_max are the minimum and maximum depth of penetration into the trench backfill of the closed drainage of the root system of cultivated culture, respectively, cm; (h_d)_min is the minimum depth of placement of closed drainage pipes of the project at the site where deep loosening is planned to be carried out, cm; D is the outer diameter of the closed drainage pipes at the site (cm); ΣΔh_i is the sum of corrections (cm), including: the correction which depends on the accuracy of the topographic altitude survey of soil surface of the drained site, Δh₁; the corrections taking into account the technogenic erosion of the soil surface during carrying out crop-engineering and land planning Δh₂ and during ploughing Δh₃; correction taking into account the depth of the gauge made by the tractor on the soil surface during deep loosening, Δh₄; h_t is the maximum possible depth of loosening soil due of the technology level and characterising the industrial feasibility of the inventive method; at that in each point of the drainage trench the thickness of the powdering layer of the drainage pipe over the bottom of the trench m_p > h_d - h_l, where h_d is the depth of placement of the closed drainage pipe. Prior to loosening the soil on the drained part the value of the set depth of deep loosening is set on the mechanism of the ripper when setting up, preparing it for work.

EFFECT: positive result is to obtain by a landholder of closed drainage durable and reliable in operation, providing design humidity conditions of soil during its operation for at least a normative term of service.

2 cl