| 摘要: |
| 3年小麦/玉米带田定位试验研究明确了①每公顷总量分别为450、900和1350kg N的氮肥第1年一次性施用和分年施用的增产效果,每公顷450 kg左右N为带田适宜施氮量;②一次性施用氮肥后的残效、影响残效大小及持续性的主要因素是氮肥用量及土壤保肥性;③不同用量及不同分配方式氮肥的当年利用率比累积利用率低5.7%～2.0%,评价氮肥利用率的高低时,应将残效考虑在内;④等量氮肥分年施用与一次性施用相比,增产效果及氮肥利用率高得多。 |
| 关键词: 带状间作，氮肥残效，氮回收率，氮肥 |
| DOI： |
| 分类号:S143.1 |
| 基金项目:甘肃省科委资助项目 |
|
| Residual Effects and Recovery Rate of N Fertilizer in Wheat/Maize Strip Intercropping |
|
Li Long 1 Zhang Lihui 1 Jin Shaoling 1 Sun Ningke 2 Ma Yongtai 2 Suo Dongrang 2 Wu Guoqing 2,Li Long 1 Zhang Lihui 1 Jin Shaoling 1 Sun Ningke 2 Ma Yongtai 2 Suo Dongrang 2 Wu Guoqing 2,Li Long 1 Zhang Lihui 1 Jin Shaoling 1 Sun Ningke 2 Ma Yongtai 2 Suo Dongrang 2 Wu Guoqing 2
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| Abstract: |
| 3-year wheat/maize strip intercropping field experiments showed①Rational rate of N fertilizer application in the first year with single application or application in years was 450 kg N/hm2 for wheat/maize strip intercropping;②The key factors
of residual effects and sustain after one-time application of N fertilizer depend mainly on
the application amount of N and soil nutrient holding capacity;③The first-year utilization ratio of N fertilizer with different application amount and differently distributive application ways is 5.7～20.0% lower than that of accumulative utilization,and the residual effects should be taken into consideration when the utilization ratio is evaluated;④
Application of certain amount of N fertilizer in years had much better results than single
application only in the first year. |
| Key words: wheat/maize strip intercropping,residual effects of N fertilizer, N recovery ratio, N fertilizer |
