Nitrogenous fertilizers are an effective means of increasing crop productivity, especially in the nonchernozem zone, humid regions of the forest steppe, and the zone of irrigated agriculture where the soils do not contain enough nitrogen. The fertilization rates vary with soil conditions, biological characteristics of the crops, and available supply of manure or other organic fertilizers. Nitrogenous fertilizers are used as the base fertilizer and as supplementary feeding. They are added to winter crops which were sown after a clean fallow only as early spring supplements (30–40 kg of nitrogen per ha) on semithawed soil (on the ground’s ice “crust”). In all zones of the USSR, it is useful to add nitrogenous fertilizers at the full rates to spring crops before sowing and, if the crops are to be irrigated, in stages before irrigation. Cotton is fertilized three times: before sowing, at the start of budding, and at the start of flowering (one-third of the rate at a time). ...
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