ESTABLISHING A TECHNOLOGY FOR CULTIVATING CEREALS AND INDUSTRIAL CROPS, ON ACID SOILS IN REGIONS IN THE SOUTH OF SOUTHERN CARPATHIANS, AMELIORATED WITH SLUDGE RESULTING FROM THE PURIFICATION OF URBANSEWAGE PROCESSED BY SC APA CANAL 2000 SA PITETI

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.