Year: 1972
Type: article
Abstract: Field experiments were conducted on organic soil for 3 years using relatively high rates of N to evaluate the influence of N on the growth and maturity of onions. In 2 years with low rainfall, maturity was not influenced, but yields declined with increasing rates of N. The decline in yield was originally attributed to ammonium toxicity, but observations with 3 sources of N indicated that high concn of fertilizer salts also could have caused injury to the plants. With high rainfall, yields increased with each increase in N, and as much as 240 lb. of N/acre was required for normal growth and maturation, while those onions receiving less than 120 lb. of N/acre were deficient in N and failed to mature properly. Utilizing different methods of incorporating N in the soil to evaluate the toxic response to N was unsuccessful in the wet season. Some indication of injury to the young seedlings occurred with the highest rates of N banded beneath the row, but these symptoms disappeared during subsequent periods of high rainfall.
Author: Jerald W. Riekels
Institution: University of Guelph
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
Estimated APC paid: $3,500
OpenAlex ID: W4300877420