Year: 1993
Type: article
Abstract: To demonstrate the effect of nitrogen application at various growth stages on the tuber yield of the potato plant (Solarium tuberosum L. cv. Danshakuimo), the partial production efficiency of nitrogen absorbed (PPE(N)) during growth and the effect of nitrogen topdressing were examined, and the results obtained were as follows. 1. PPE(N) decreased rapidly after the lowering stage, because, when nitrogen was applied continuously after the lowering stage, the number and one-tuber weight of the primary-1st order tubers did not increase.2. Nitrogen topdressing after the flowering stage adversely affected the tuber yield, particularly when nitrogen was applied near harvest. This phenomenon was ascribed to the fact that the number of tubers was almost constant and tne one-tuber weight decreased. In contrast, when nitrogen was applied before the lowering stage, since the number of tubers decreased and one-tuber weight increased with growth until the flowering stage, the yield was not affected. It was eventually concluded that nitrogen application during the tuber swelling stage did not affect or exerted a negative effect on the increase of the tuber yield because the photosynthetic rate did not increase by nitrogen application.
Source: Soil Science & Plant Nutrition
Institution: Hokkaido University
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2003640441