Nitrogen balance in irrigated potatoes in sandy-textured soils

Halitligil, M.B.; Akn, A.; Ilbeyi, A.

Nuclear techniques in integrated plant nutrient, water and soil management Proceedings of an International Symposium held in Vienna, Austria, 16-20 October 2000: 209-216


Accession: 004249278

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To obtain information on potato yield, N uptake, residual fertilizer N in the soil, and the portion of fertilizer N leached below a depth of 200 cm, field experiments were conducted at three locations in 1992, 1993, and 1994, with soil textures ranging from sandy to silty loam in the Cappadocia region of Turkey. In all of the experiments ammonium sulphate was applied at six rates (0, 200, 400, 600, 800, and 1,000 kg N/ha). The fate of the applied fertilizer N was determined for the 400 and 1,000 kg N/ha rates by using ammonium sulphate enriched in 15N at 5 and 2% atom excess, respectively. Sprinkler irrigation was applied weekly, starting after hilling in mid-June. Irrigations ranged from eleven to seventeen depending on year and location. Optimum marketable tuber yields were obtained with 600 kg N/ha. The amount of fertilizer N in the 0- to 200-cm soil layer increased more than three fold when the N rate was increased from 400 to 1,000 kg/ha. Nearly half of the applied fertilizer N (46%) at 400 kg/ha and more than half of it (61%) at 1,000 kg/ha remained in the 0- to 200-cm soil layer after harvest. Four times more N fertilizer was leached beyond a depth of 200 cm when 1,000 kg N/ha was applied in comparison with 400 kg N/ha.