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Effects of Nitrogen and Sulfur on Canola Yield and Nutrient Uptake
Author(s) -
Jackson Grant D.
Publication year - 2000
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2000.924644x
Subject(s) - canola , agronomy , brassica , nitrogen , human fertilization , fertilizer , nutrient , yield (engineering) , crop , field experiment , sulfur , chemistry , biology , materials science , organic chemistry , metallurgy
Spring canola ( Brassica napus L. var. napus ) is becoming a significant oilseed crop adapted to the western USA. Often N and S limit crop growth. Field experiments were established to study the effects of N and S fertilization on seed yield, oil content, and N, P, K, and S uptake of spring canola. Four N rates in combination with three S rates were evaluated on two irrigated and three rainfed locations in the western triangle area of Montana near Conrad. Seed yields ranged from 0.1 to 3.8 Mg ha −1 . Seed yield and oil content N responses were closely related to available N (fertilizer N plus soil NO 3 –N in 90 cm of soil). Seed oil content varied from 370 to 510 g kg −1 and was depressed by increasing N. Optimum seed and oil yield occurred at about 200 kg N ha −1 . Two of the experimental sites responded to S. About 20 kg S ha −1 was adequate for optimum seed and oil yields. At the optimal N and S levels, total plant N, P, K, and S uptake averaged 140, 25, 170, and 60 kg ha −1 , respectively. Of the total N, P, K, and S accumulation, about 40% of the N, 30% of the P, and 85% of the K and S remained in the postharvest residue.