不同播期对紫云英生长及物质养分积累的影响

在大田试验条件下,设置了自2009年9月25日—11月6日共7个播种时期,研究不同播期对紫云英生长、产量及养分吸收的影响。试验结果表明,紫云英的密度、株高、单株复叶数、表观叶面积和单株重均随播期推迟而下降。鲜草产量随播期推迟显著降低,9月25日播种的鲜草产量最高,达31833 kg/hm2,种子产量则以10月2日播种的最高,为227 kg/hm2。地上部N、P、K、Cu含量均随播期推迟呈下降趋势,10月30日之后播种处理的Fe、Mn含量则显著增加,而不同播期对Ca、Mg、Zn含量无影响。各养分积累量均随播期推迟而下降。研究表明,播期显著影响紫云英生长及物质养分积累,本试验条件下宜在9月下旬至10月上旬期间播种。

Effects of sowing date on Chinese milk vetch growth and nutrient accumulation

A field trial was carried out to study the influence of different sowing date on Chinese milk vetch growth, fresh yield and nutrient accumulation. The results showed that the shoot height, compound leaves per plant, apparent leaf area, weight per plant decreased as the sowing date postponed. Fresh yield decreased prominently as the sowing date postponed, sowing date at 25th September could get the highest yield, reached to 31 833 kg/hm2. Sowing date at 2nd October could get the highest seed yield 227 kg/hm2. N, P, K and Cu contents of the shoot decreased as the sowing date postponed, but Fe and Mn contents increased when the sowing date later than 30th October, while there was no difference among the treatments with the Ca, Mg and Zn contents. The nutrient accumulation decreased as the sowing date postponed. The study showed that sowing date had great effect on Chinese milk vetch, the last ten-days period of September and the first ten-days period of October was the best sowing date under this condition of experiment.