| 摘要: |
| 应用~(15)N 示踪技术,根据作物在石灰性土壤上对不同氮肥中氮素的吸收利用、氮素平衡和对磷、钾吸收量的差异所取得的研究结果表明,冬小麦对肥料氮和土壤氮的吸收利用与氮肥形态有关。尿素与硫铵的氮素利用率高于碳铵,肥料氮的损失量碳铵>硫铵>尿素,而在土壤中残留量则尿素>硫铵>碳铵,肥料氮的损失量与土壤中残留量呈显著负相关。施用碳铵的土壤供氮力(A 值)及激发卒高于硫铵与尿素。土壤供氮力与作物对土壤氮的吸收量间具有线性相关关系。碳铵的相伴阴离子有助于冬小麦对土壤氮的吸收。 |
| 关键词: 氮肥品种 肥料氮 钾吸收 氮素利用率 尿素 夏玉米 冬小麦 氮肥形态 土壤氮 土壤供氮 |
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| STUDY ON THE EFFICIENCY AND UTILIZATION OF VARIOUSN-FERTILIZERS AND THEIR EFFECT ON K,P ABSORPTION |
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| Abstract: |
| Ammonium carbonate,ammonium sulfate and urea are widely used nitrogen fertilizers for wheat crop in the PRC.The evaluation of their fertility efficiency,and their prolonged effect on wheat and its succed- ing crop of summer corn is established by~(15)N tracing technique in present pot experiment as follows: 1.In the limy district,ammonium carbonate,ammonium sulfate and urea when applied as basal dressing are equally effective in increasing the wheat production. 2.It was found that the efficiency of urea,amm... |
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