作者: S. S. Malhi , R. L. Lemke
DOI: 10.1080/01904167.2013.836227
关键词: Nitrogen 、 Seedling 、 Brassica 、 Urea 、 Canola 、 Crop yield 、 Straw 、 Agronomy 、 Chemistry 、 Tillage
摘要: Seedrow-placed urea minimizes soil disturbance in reduced tillage systems, but it generally decreases seedling emergence (or stand density) at nitrogen (N) rates adequate for optimum crop yield. Two three-year field experiments were conducted on canola (Brassica napus L.) and spring wheat (Triticum turgidum Melfort Research Farm, Saskatchewan, Canada, to determine the influence of N rate (40, 80 120 kg ha−1), source [untreated (urea), polymer-coated (ESN), treated with Dicyandiamide (DCD) N-(n-butyl) thiophosphoric triamide (NBPT or AgrotainTM) (SuperU) 2007, NBPT only (AgrotainU) 2008 2009], placement (side-banded seedrow-placed N, using knives create 2 cm wide band), plus a zero-N control, emergence, seed straw yield, protein concentration (PC) seed, uptake straw. For both crops, side-banded had no detrimental effect compared control all sources. Seedro...