The researches on rice population began with 1950s in China, and many results were instructive value to rice breeding and cultivation.

我国50年代就开始了水稻群体研究，对水稻育种和栽培有着重要的指导意义。

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The study has been based on both the model for rice population growth and the model for simulating population life system of lice case worm.

本研究是在水稻群体生长模型和纵卷叶螟种群生命系统模拟模型的基础上进行的。

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The time of dynamic nitrogen adjustment were determined by regular patterns or by the comprehensive evaluation of soil mineral nitrogen concentration and rice population status.

氮素动态调控时期由高产栽培常用的追肥时期或根据水稻群体状况与土壤矿质态氮浓度综合判断确定，追氮量由模型计算获得。

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Some economists say prices for rice, the staple food for much of the world's population, could be returning to levels that sparked inflation fears in much of Asia last year.

VOA: standard.2009.12.17

Consumption of wheat, rice and maize roughly tracks population growth but at a higher level, so demand for them will add about a billion tonnes to the 2 billion produced in 2005-07.

ECONOMIST: The answer is less straightforward than it seems

About 20 percent of Blackburn's population is Muslim, and Rice had been invited to visit the mosque.

CNN: Rice: Thousands of errors in Iraq

For the first time since the 1960s the yields of the world's most important crops, wheat and rice, are rising more slowly than the global population (see special report).

ECONOMIST: The future of food