Method for reducing cadmium content in grasses and vegetables
A vegetable and pasture technology is applied in the field of reducing the cadmium content in pasture and vegetables, which can solve the problems of unsatisfactory soil passivation repair effect, affecting the continuous application of passivating agents, unstable effect, etc. Prospects, the effect of reducing bioavailability
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Embodiment 1
[0020] The soil in this example is a vegetable garden soil that has been polluted by cadmium for many years, and the cadmium content is 8.2 mg / kg. Before applying the passivation agent, 26kg of urea and 37kg of potassium nitrate were applied per mu as base fertilizer.
[0021] Before sowing, the sodium silicate (Na 2 SiO 3 ·9H 2 O) or potassium silicate (K 2 O·nSiO 2 ·H 2 O, SiO 2 The content is 48%~54%), and potassium dihydrogen phosphate is dissolved in water at the application amount of 10kg silicon and 10kg phosphorus per mu to form a mixed solution and then evenly applied to the soil. Afterwards, forage grain amaranth and leaf vegetable red amaranth were sown for routine management.
[0022] As a control, the forage grain amaranth and leaf vegetable red amaranth were sown directly in the soil without adding any additives.
[0023] Sodium silicate, 20kg silicon per acre, 20kg silicon per acre, potassium dihydrogen phosphate 20kg phosphorus per acre, were formulated into solution...
Embodiment 2
[0037] Through Example 1, the combination of sodium silicate and potassium dihydrogen phosphate with the best passivation effect was selected for further testing. The soil in this example is vegetable garden soil that has been polluted by cadmium for many years, and the cadmium content is 6.1 mg / kg. Before applying the passivation agent, 26kg of urea and 37kg of potassium nitrate were applied per mu as base fertilizer.
[0038] Before planting, mix sodium silicate and potassium dihydrogen phosphate at a rate of 9kg silicon and 10kg phosphorus (Si 1 +P 1 ), 9kg silicon and 20kg phosphorus (Si 1 +P 2 ), 17kg silicon and 10kg phosphorus (Si 2 +P 1 ), 17kg silicon and 20kg phosphorus (Si 2 +P 2 ) Are combined separately and dissolved in water to form a mixed solution, then uniformly applied to the soil, and then seeded amaranth, for routine management.
[0039] As a control, forage seed amaranth was sown directly in the soil without adding any additives.
[0040] It turns out that apply...
Embodiment 3
[0048] In order to test the best application method of this modifier, the application concentration of 9kg silicon and 10kg phosphorus per mu is specially selected, sodium silicate and potassium dihydrogen phosphate are respectively mixed into aqueous solutions, and potassium dihydrogen phosphate is first applied to the cadmium contaminated soil Solution, wait for it to fully interact with the soil, and then apply the sodium silicate solution. Afterwards, the seed amaranth is sown and routinely managed. The soil and basal fertilizer application scheme in this example is the same as in example 2.
[0049] As a control, forage seed amaranth was sown directly in the soil without adding any additives.
[0050] After implementing this example, the yield of grain amaranth has been greatly increased. Compared with the control, the yield of grain amaranth increased by 1.18 times. The Cd content in roots, stems and leaves also decreased from 80, 21 and 93 mg / kg of the control to 19, 9, an...
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