180 results about "Paddy soils" patented technology

The invention belongs to the technical fields of control of soil pollution and quality safety of agricultural products and provides a method for restoring paddy cadmium pollution by combining water management with passivator adding in order to solve the control problem of paddies with severe cadmium pollution. The method comprises the steps that cadmium polluted paddy soil is treated through a composite passive material, rice is transplanted, water management is conducted, and the composite passive material is formed by proportionally mixing natural palygorskite and sulfydryl-modified palygorskite. Rice with the cadmium content reaching the standard can be produced through the paddy soil with severe cadmium pollution, the soil pollution problem is solved, the food security is ensured, and the method is significant. The composite passive material is easy to apply, low in cost and free of adverse effect on environment and does not influence regular growth and yield formation of rice, and the passivation effect on cadmium in soil can be maintained for 3-4 years by applying the composite passive material to soil once. After the composite passive material is applied to the cadmium polluted paddies soaked in water for a long time, the effect that cadmium accumulation is reduced is remarkable, and the cadmium content of produced brown rice meets the current national standard.

The invention provides a plantation method of paddy rice. The method comprises the following steps: a), stubbling and weeding: after preceding crops are harvested, performing stubbling, and carrying out weeding processing before the paddy rice is planted; b), trench digging: digging trenches before the paddy rice is planted; c), field steeping: discharging water to a field for steeping the field ten to fifteen days before machine-transplanted seedling, the depth of the water being 5 to 10cm, and steeping the field until the unit weight of surface soil is 0.9g/cm<3> below; d), machine planting: carrying out the machine planting when a water layer is 0.5 to1.5cm, the depth of the machine planting being 2 to 3cm; and e), performing field management. According to the tillage-free machine-transplanted seedling method provided by the invention, the soil of a rice field does not have to be ploughed by machinery, the soil is softened through steeping the field in the water before the machine planting, and the machine planting is carried out by use of a rice transplanter, such that the cultivation cost is decreased, the soil working link is reduced, rich-water loss is reduced, at the same time, the problem of easy fall of the rice transplanter into slurry, caused by too deep and too muddy conventionally ploughed slurry and the problems of turning-green and tillering of seedlings, affected by too deep insertion of the seedlings into the soil by use of a conventional ploughing machine are solved, and the machine planting yield is high.