PROCESS FOR GROWING FIELD CROPS ON ACID SOILS

摘要

The invention relates to a process for cultivating field crops on acid soils. According to the invention, the process consists in ameliorating the soil by a 4-years crop rotation with an ameliorating crop in rotation of the maize-wheat-soya type for wheat grains with domestic sludge resulting from the purification of urban sewage as such or in admixture with an organic fertilizer in a dose of 5...15 t/ha, then the crop in rotation is tilled at a depth of 18...20 cm and it is cultivated with cereals, then there are applied the usual maintenance works, there resulting an average yield of 7...8 t/ha of maize grains, second year wheat 6...7 t/ha, soya 2...2.5 t/ha, fourth year wheat 4...4 t/ha, having a concentration in heavy metals of under 0.12 mg/kg d.s. Cd, 25 mg/kg d. s. Pb, 28 mg/kg d. s. Zn and an ameliorated crop in rotation, exhibiting, after 4 years of cultivation, a contamination index Iof 0.356 for the plant leaves at the flowering time and Iof 0.612 for the contents in nature grains of the plants, at maturity.