บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effects of nitrogen and sulfur on canola yield and nutrient uptake.

Jackson, G. D.;

Agronomy Journal Year: 2000 Vol: 92 Issue: 4 Pages: 644-649 Ref: 21 ref.

2000

บทคัดย่อ

Effects of nitrogen and sulfur on canola yield and nutrient uptake.

Spring canola [rape] (Brassica napus var. napus) is becoming a significant oilseed crop adapted to the western USA. Field experiments were established to study the effects of N and S fertilizer application 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 t ha-1. Seed yield and oil content N responses were closely related to available N (fertilizer N plus soil NO3-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 accumu

lation, about 40% of the N, 30% of the P, and 85% of the K and S remained in the postharvest residue.