Dynamics of calcium,magnesium and sulfur uptake in 4 double-low rapeseed （Brassica napus L. ） varieties | 4个双低甘蓝型油菜品种钙、镁、硫吸收动态

صينى. 田间条件下，研究了4个双低油菜品种全生育期内中量元素钙、镁、硫含量及累积量变化动态。结果表明：试验条件下，油菜Ca、Mg养分含量随生育期的推进总体呈现降低趋势，S含量呈“M”型变化趋势。收获期每公顷油菜平均从土壤中带走CaO 187．3kg，MgO 60．2kg，S55．7k。苗期、蕾薹期及花期CaO积累比例分别占最大吸收量的22．8％～36．7％、20．9％～24．4％、42．4%～52．8％；MgO积累比例分别占21．4％～31．8％、21．2％～29．7％、47．1％～57．3％；S积累比例分别占15．7％～29．2％、21．5％～31．0％、39．8％～62．8％；薹花期是油菜Ca、Mg、S营养最大效率期；角果期3种养分积累量均呈负增长。每生产100kg籽粒养分的需求量平均为CaO 6．2kg、MgO 2．0kg和S1．8kg。[著者文摘]

إنجليزي. A field experiment was carried out to study the calcium（Ca） ,magnesium（Mg） and sulfur （S） uptake trends in 4 varieties of double-low rapeseed. The results showed that Ca and Mg concentration in the above-ground were decreased gradually with growing time. The dynamic changes of S concentration showed an ＂M＂ curve. The accumulation in the above-ground at harvested averaged CaO 187. 3 kg/hm. ,MgO 60. 2 kg/hm. and S 55.7 kg/hm. . The proportion of CaO in seedling period, bud period and blooming period were 22. 8%-36.7% ,20. 9%-24. 4% and 42.4%-52.8% ,respectively. The proportion of MgO were 21.4%-31.8%,21.2%-29.7% and 47. 1%-57. 3%. S uptake were 15. 7%- 29.2% ,21.5%-31.0% and 39.8%-62.8%. The most efficient periods of Ca,Mg and S nutrition for rapeseed were during bud and flowering. In pod period,all the 3 kinds of nutrient accumulation appeared negative increase. Nutrients required by double-low rapeseed for producing every 100 kg seeds were CaO 6.2 kg,MgO 2.0 kg and S 1.8 kg.