氮肥对白蒜干物质动态变化影响

Effect of Nitrogen on Dry Matters Dynamic Change of Garlic

【目的】研究不同氮素水平对白蒜干物质形成、积累规律的影响。【方法】以新疆白皮大蒜为试材,设6个施肥处理5个氮素水平,研究了氮素对高寒地区大蒜干物质积累的影响。【结果】随着氮肥用量的增加大蒜的干物质积累也随之增加,增加量分别为N18.4%、N213%、N317.4%、N419%、N518.2%,其中以N4增加最多,N5叶面积最大但在生育后期叶片快速衰老死亡,有早衰迹象。在鳞茎膨大期,干物质日积累量表现出随氮肥增加而下降的趋势。

The study was conducted to evaluate the influence of nitrogen on development and accumulation law of the garlic. Six fertilization treatments and five N levels were designed to study the N effect on alpine region garlic dry matter accumulation. The result showed that the garlic dry matter accumulation were increased with the growing N application rates, and the growth rates were N1 8. 4 %, N2 13 %, N3 17.4 %, N4 19 %, N5 18.2 %, respectively N4 was the most, N5 leaf area was the biggest and had premature senility evidence that the leaf die lastly at the end of bearing period. At the expansion stage of bulb, the dry matter accumulation were decreased with the increasing of N application rate.