潮土区氮肥不同基追比和种类对玉米产量和氮肥利用率的影响

Effects of Different Ratio of Base N to Dressed N and Type of Nitrogen Fertilizer on Maize Yield and Nitrogen Use Efficiency in Fluvio-aquic Soil Region

研究了氮肥不同基追比和种类对玉米产量和氮肥利用率的影响。结果表明：33.3%普通尿素基施＋33.3%大喇叭口期追施＋33.3%抽雄期追施处理表现最佳,产量最高,达8 668kg/hm^2。氮素用量减至80%的控释尿素基施处理和控释BB肥基施处理产量分别为8390kg/hm^2和8 512kg/hm2,控释BB肥基施处理产量高于控释尿素基施处理,与33.3%普通尿素基施＋33.3%大喇叭口期追施＋33.3%抽雄期追施处理产量均没有达到1%极显著水平。在施用普通尿素的各个处理中,33.3%基施＋33.3%大喇叭口期追施＋33.3%抽雄期追施处理的氮肥利用率最高,为39.1%,可见适当的施肥方式能提高氮肥的利用率。控释尿素基施处理和控释BB肥基施处理的氮肥利用率分别为46.8%和49.5%,均高于施用普通尿素的各个处理,控释BB肥基施处理的氮肥利用率高于控释尿素基施处理。

Unlike the risk adjusted discount rate （RADR） approach, the （subjective） certainty equivalence （CEQ） approach can not lead to objective valuation results. Moreover, （subjective）CEQ derived from popular utility functions such as CARA and CRRA normally can not satisfy the requirements of additivity and multiplicativity simultaneously, hence this approach can lead to contradictions during capital budgeting, even from the viewpoint of a given decision maker. Analysis based on the non-arbitrage axiom in a binomial model reveals the relationship among RADR, CEQ, and risk neutral probability（RNP） approach, which implies that CEQ used in capital budgeting should be the risk-neutral expectation in nature. （Objective） CEQ formulated in beta and market risk premium with absolute prices in the CAPM framework restores its objective nature and facilitates its application.