粮食产量预测是制定农业政策的重要依据。
The forecast of grain production is an important resource for establishing agriculture policy.
预测结果表明该模型具有较高的预测精度，为粮食产量预测提供了一条新的途径。
The result is given that the forecasting model is effective and offers a new method to forecast the grain production.
给出了粮食产量预测的常用模型，通过加权组合，进而确定组合预测模型以提高预测精度。
Given the commonly used food production forecast model, with the aid of a weighted combination of prediction model to determine the combination, the prediction accuracy will be improved.
一些分析人士预测，粮食产量需要提高50%才能维持目前的水平。
Some analysts estimate that food production will need to be raised by 50 percent to maintain current levels.
2010世界粮食产量预计将收缩2%，而在6月份的预测还称其将增收1.2%。
World cereal production is now expected to by 2% in 2010; in June it was forecast to expand by 1.2%.
粮食产量受到多个不确定因素的影响，它的预测历来是一个难点。
Owing to a lot of uncertain factors influencing the grain yield, its prediction has always been a difficult point.
科学准确地预测粮食产量，对于制定国民经济计划十分重要。
It is important to the national economic plan to forecast crop yields scientifically and accurately.
尝试将组合预测法应用于我国未来粮食产量的预测，以提高预测精度。
Combination forecasting model will be applied to forecast the grain production of China, in order to make the result more exact.
利用投入占用产出技术及系统科学方法，对2030年中国的粮食产量、粮食进口量及自给率进行了预测。
Using the input-occupancy-output techniques and system science methods, this paper makes a forecast about Chinas grain output, grain import and self-support rate in the year 2030.
本文利用指数平滑法，并结合本溪市1991- 1999年粮食产量的统计资料对未来几年内本溪市的粮食产量做出了预测。
By using smoothed exponential method and combining the statistic data of grain yield in 1991-1999 for Benxi area, the paper presents perspective grain yield in the near future fears.
本文利用指数平滑法，并结合本溪市1991- 1999年粮食产量的统计资料对未来几年内本溪市的粮食产量做出了预测。
By using smoothed exponential method and combining the statistic data of grain yield in 1991-1999 for Benxi area, the paper presents perspective grain yield in the near future fears.
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