氮肥用量对甘薯干物质积累和氮磷钾吸收的影响 |
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引用本文: | 陈娟,曲明山,郭宁,陈保华,张静,张怀文,廖洪.氮肥用量对甘薯干物质积累和氮磷钾吸收的影响[J].农学学报,2014,4(3):35-38. |
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作者姓名: | 陈娟 曲明山 郭宁 陈保华 张静 张怀文 廖洪 |
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作者单位: | 1. 北京市土肥工作站2. |
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摘 要: | 在北京顺义区农科所基地开展田间试验,设置5个氮水平处理,研究不同氮肥用量对甘薯干物质积累及氮磷钾吸收效率的影响。结果表明:施氮量为210 kg/hm2时,甘薯的鲜薯产量达到最大值30.4 t/hm2;甘薯干物质积累量为21423 kg/hm2,氮磷钾累积值也达到最大;当施氮量超过210 kg/hm2时,干物质积累量随着施氮量的增加而不再增加,而呈平台反应;施氮量为210 kg/hm2时,甘薯磷、钾累积值也最大,分别是145.7 kg/hm2和247.4 kg/hm2。因此,本试验条件下甘薯的最佳氮肥用量为210 kg/hm2。
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关 键 词: | 氮磷钾吸收效率 |
收稿时间: | 2013/8/19 0:00:00 |
修稿时间: | 2013/9/22 0:00:00 |
Nitrogen Applying on Dry Matter Accumulation and N, P and K Absorption Efficiencies of Sweet Potato |
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Abstract: | Field experiments were conducted at the station of Shunyi Agriculture Sciences Institute in Beijing. This study is about the effects of 5 levels of nitrogen applying on dry matter accumulation and N, P and K absorption efficiencies of sweet potato. It is indicated that yield reached the highest value of 30.4 t/hm2 at N level of 210 kg/ hm2, and the corresponding dry matter reached 21423 kg/hm2 and the P and K accumulations reached the highest values of 145.7 kg/hm2 and 247.4 kg/hm2. When the N level exceeded 210 kg/hm2, dry matter did not increase with the increase of N applying which showed a platform relationship. We can conclude that 210 kg/hm2 N was the optimum N level for sweet potato. |
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Keywords: | N P and K absorption efficiencies |
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