播期、密度和氮肥用量对‘浙油50’产量和含油量的影响

以甘蓝型油菜高含油量新品种‘浙油50’为供试品种,研究不同播期、密度和氮肥用量对其产量、经济性状和含油量的影响,探索‘浙油50’的高产高效栽培技术。结果表明:在供试条件下9月20日—10月10日播种期,随着播期推迟,平均产量、含油量及单株总角数、单株产量、一次分枝数和主花序结角密度均呈下降趋势,而千粒重不断增大;种植密度7.5万株.hm-2的平均产量、含油量和有效分枝位显著低于10.5万株.hm-2和13.5万株.hm-2的密度水平,单株角果数、单株产量和一次分枝数与之相反,而10.5万株.hm-2和13.5万株.hm-22个密度水平间以上性状除有效分枝位外无显著性差异。在氮肥用量150～450 kg.hm-2范围内,施用氮肥越多,产量极显著增高,一次分枝数越多,单株总角数越多,单株产量也越高,而每角粒数越少,含油量越低。

Effect of sowing-date, density and nitrogen application rates on yield and oil content of Brassica napus L.cv.Zheyou 50

The winter rapeseed cultivar Zheyou 50 was used as test material.The effects of sowing-date,density and nitrogen application amount on yield,economic characteristics and oil content were studied to explore high-yield and high-efficient cultivation techniques.Results showed that lower yield per hm2,oil content,pods per plant,yield per plant,primary effective branches and density of pods but higher kilo-grains weight was detected on the later sowing-date during September 20th to October 10th,.The yield per hm2,oil content and effective branch position was significantly lower,but the pods per plant,yield per plant and primary effective branches was significantly higher with the density of 75 000 plants per hm2 than 105 000 and 135 000 plants per hm2.Within the range of 150-450 kg·hm-2 of nitrogen,yield significantly increased with the increased input of nitrogen fertilizer.Increase in the numbers of the primary branch was correlated to increases of pods per plant and yield per plant,whereas decrease of the grains per pod was correlated to decreased oil content.