Premium
Applied and Residual Nitrate‐Nitrogen Effects on Irrigated Grain Sorghum Yield
Author(s) -
Onken Arthur B.,
Sunderman Herbert D.
Publication year - 1972
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1972.03615995003600010022x
Subject(s) - sorghum , loam , residual , nitrogen , agronomy , nitrate , fertilizer , environmental science , yield (engineering) , mathematics , soil science , zoology , chemistry , soil water , biology , materials science , organic chemistry , algorithm , metallurgy
Multirate nitrogen studies were conducted for a 3‐year period, on an irrigated clay loam soil at two locations, to determine the influence of applied and residual soil N on the yield of grain sorghum ( Sorghum bicolor L. Moench). Soil samples were taken prior to fertilizer application in depth increments of 0–15, 15–30, 30–61, and 61–91 cm and analyzed for nitrate. Applied and residual soil NO 3 ‐ ‐N were found to influence grain yields. Regression analysis of the data showed highly significant relationships between (i) quantities of soil nitrates measured at upper depths to those measured at lower depths, and (ii) grain yield and applied N + residual NO 3 ‐ ‐N. Best correlations were obtained when residual NO 3 ‐ ‐N was included in the regression equation. Results indicated that soil samples taken to 15 or 30 cm would be sufficient for evaluation of residual nitrogen effects.