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jensen model
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  jensen模型
    New definition and computation on the water sensitive index in Jensen model
    Jensen模型水分敏感指数的新定义及其解法
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    This paper compares genetic programming model with BP networks model, Jensen model and Blank model and the outcomes show that the genetic programming model has high accuracy and is more effective. The model provides a new approach to calculate water production function.
    将基于遗传程序设计作物水分生产函数模型同BP神经网络模型、Jensen模型以及Blank模型进行比较,实例表明,遗传程序设计的作物水分生产函数模型适应性强,拟合精度高,为作物水分生产函数的计算提供了新的有效方法。
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    The expressions of water-nitrogen production function are classified into several types and the characteristics and disadvantages of each type of function are analyzed. Based on the definitions of water production function and nitrogen function and the analysis on similarity of production increasing effect curves the authors point out that the establishment of nitrogen effect function and waternitrogen production function in growing stage based on Jensen model is the direction of further research in the near future.
    本文概括了水氮生产函数几种类型,分析了不同水氮生产函数的特点和存在的问题,根据水分生产函数与氮素效应函数定义和增产效应曲线的相似性指出,未来作物氮素效应函数和作物水氮生产函数研究的发展方向应该是建立基于Jensen模型的生育阶段氮素效应函数和水氮生产函数。
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  “jensen model”译为未确定词的双语例句
    By analysis on incremertal effect of irrigation in different growth stages ofthe lucerne and yield less due to water deficiency,the paper calculated the sensitive index ofwater deficiency in different growth sfages of the luceme by Jensen Model,and puts forwardthe system model of optimum irrigtion of the lucerne under water deficient condition. At thesame time it introduces the method which can resolve the optimun irrigation system by dy-namic program,and the calculated result of the optimum irrigation system of the lucerne.
    通过对苜蓿各生长阶段灌水的增产效果及缺水对产量的影响分析,应用詹森(Jensen)模型计算出了苜蓿各阶段缺水敏感性指标,提出了缺水灌溉条件下苜蓿优化灌溉制度模型,并详细介绍了用动态规划法求解优化灌溉制度的方法。
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  jensen model
In this study a function for transformingthe readily available yield response factors of Doorenbos andKassam's model to the sensitivity index of Jensen model isderived.
      


By analysis on incremertal effect of irrigation in different growth stages ofthe lucerne and yield less due to water deficiency,the paper calculated the sensitive index ofwater deficiency in different growth sfages of the luceme by Jensen Model,and puts forwardthe system model of optimum irrigtion of the lucerne under water deficient condition.At thesame time it introduces the method which can resolve the optimun irrigation system by dy-namic program,and the calculated result of the optimum irrigation...

By analysis on incremertal effect of irrigation in different growth stages ofthe lucerne and yield less due to water deficiency,the paper calculated the sensitive index ofwater deficiency in different growth sfages of the luceme by Jensen Model,and puts forwardthe system model of optimum irrigtion of the lucerne under water deficient condition.At thesame time it introduces the method which can resolve the optimun irrigation system by dy-namic program,and the calculated result of the optimum irrigation system of the lucerne.

通过对苜蓿各生长阶段灌水的增产效果及缺水对产量的影响分析,应用詹森(Jensen)模型计算出了苜蓿各阶段缺水敏感性指标,提出了缺水灌溉条件下苜蓿优化灌溉制度模型,并详细介绍了用动态规划法求解优化灌溉制度的方法。

Based on the field experimental data in this paper,the crop\|water supply strategy for winter wheat and corn in farming land of arid plateau is studied.The results show that,for winter wheat,the water stress sensitivity index in Jensen model during seeding\|greening phase reaches the highest value and reaches the second highest value during booting to heading stage.It changes to the third highest value from heading to filling phase.The most important irrigation for crop production is the irrigation before...

Based on the field experimental data in this paper,the crop\|water supply strategy for winter wheat and corn in farming land of arid plateau is studied.The results show that,for winter wheat,the water stress sensitivity index in Jensen model during seeding\|greening phase reaches the highest value and reaches the second highest value during booting to heading stage.It changes to the third highest value from heading to filling phase.The most important irrigation for crop production is the irrigation before winter and the second important one is during booting and heading phase.The third one is during heading and filling phase.Irrigation in other growth phases is not very important.Optimum irrigation quantity and total water consumption for high drop yield and high water use efficiency are experimentally determined.

本文依据田间试验数据 ,采用Jensen模式 ,研究了黄土旱区冬小麦、春玉米这两种优势作物的—水分模型 .研究结果表明 ,小麦在播种~返青期缺水敏感指数 (λ)最大 ,对缺水最为敏感 ;拔节~抽穗期次之 ,然后是抽穗~灌浆期 ,而灌浆~成熟期和返青~拔节期的敏感性最小 .总耗水量在 32 0~ 42 0mm之间 ,灌水量为 2 6 0~ 30 0mm左右、且分布在冬前和拔节~抽穗期是节水高产高效的灌水模式 .玉米拔节 -抽穗期和抽穗 -灌浆期对缺水最敏感 ,拔节前和灌浆 -成熟期敏感性小 .说明拔节后到抽穗期补水对产量作用最大 ,其次为抽穗 -灌浆期 .这为黄土旱区制定灌溉制度提供了重要理论依据

In the past research, the water sensitive indexes greatly depend on the partition of the growing stages To solve the problem, the Jensen model is rebuilt and the water sensitive index is redefined A terse new method computing the water sensitive index is introduced according as the water sensitive indexes are able to accumulate The practical field experiment validates that the new method is well consistent with the old those 

在总结已有的作物水分生产函数Jensen模型研究工作的基础上,针对以往研究中水分敏感指数与生育阶段划分密切相关的问题,对Jensen模型进行了改造,提出了水分敏感指数的新定义。并在Jensen模型水分敏感指数的累加性分析的基础上,提出了确定Jensen模型水分敏感指数及累积曲线的更为简洁的新方法,新方法得到了田间试验的验证并与传统方法有很好的一致性。

 
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